阅读说明：本技术 激光器 (Laser device ) 是由 李巍 田有良 刘显荣 顾晓强 于 2021-09-07 设计创作，主要内容包括：本申请公开了一种激光器,属于光电技术领域。激光器包括：管壳,管壳的一面具有开口；多个发光组件,位于管壳中；透光密封组件,位于管壳的开口所在侧；准直镜组,位于透光密封组件远离管壳的一侧；其中,准直镜组包括与多个发光组件一一对应的多个准直透镜,每个发光组件用于向对应的准直透镜发出激光,准直透镜用于减小射入的激光的发散角度,且使该激光在慢轴上的发散角度减小量小于在快轴上的发散角度减小量。本申请解决了激光器发出的激光的准直性较差的问题。本申请用于发光。(The application discloses laser belongs to the technical field of photoelectricity. The laser includes: a pipe shell, wherein one surface of the pipe shell is provided with an opening; a plurality of light emitting components located in the envelope; the light-transmitting sealing component is positioned on the side of the opening of the tube shell; the collimating lens group is positioned on one side of the light-transmitting sealing component, which is far away from the tube shell; the collimating lens group comprises a plurality of collimating lenses in one-to-one correspondence with the plurality of light emitting components, each light emitting component is used for emitting laser to the corresponding collimating lens, and the collimating lenses are used for reducing the divergence angle of the incident laser and enabling the divergence angle reduction of the laser on the slow axis to be smaller than that on the fast axis. The laser device solves the problem that the collimation of laser emitted by the laser device is poor. The application is used for light emission.)

1. A laser, characterized in that the laser comprises:

the pipe shell is provided with an opening on one surface;

the light-emitting components are positioned in the accommodating space of the tube shell;

the light-transmitting sealing component is positioned on the side of the opening of the tube shell;

the collimating lens group is positioned on one side of the light-transmitting sealing component, which is far away from the tube shell;

the collimating lens group comprises a plurality of collimating lenses which are in one-to-one correspondence with the plurality of light-emitting assemblies, each light-emitting assembly is used for emitting laser to the corresponding collimating lens, and the collimating lenses are used for reducing the divergence angle of the incident laser and enabling the divergence angle reduction of the laser on the slow axis to be smaller than that on the fast axis.

2. The laser of claim 1, wherein the laser light emitted by the light emitting assembly enters the collimating lens through a first face of the collimating lens and exits the collimating lens through a second face of the collimating lens;

the first surface is used for enlarging the divergence angle of the incident laser on the slow axis; the second surface is used for reducing the divergence angle of the injected laser on the fast axis and the slow axis.

3. The laser of claim 2, wherein the first face comprises a concave arc surface having a radius of curvature in the slow axis that is less than a radius of curvature in the fast axis.

4. The laser of claim 2, wherein the first facet comprises a concave cylindrical surface, and wherein a straight generatrix of the concave cylindrical surface is parallel to the fast axis.

5. The laser of any of claims 2 to 4, wherein the second facet comprises a convex curved surface;

the curvatures of the convex cambered surfaces on the slow axis and the fast axis are the same; or the convex arc surface is a free-form surface, and the curvature radius of the convex arc surface on the slow axis is larger than that on the fast axis.

6. The laser of claim 5, wherein the radius of curvature of the convex curve in the fast axis ranges from 2.592 mm to 3.888 mm, and the radius of curvature in the slow axis ranges from 2.608 mm to 3.924 mm.

7. The laser of claim 5, wherein the radius of curvature of the convex curve in the slow axis is less than 1.2 times the radius of curvature in the fast axis.

8. The laser of claim 5, wherein the focal length of the collimating lens in the fast axis is greater than half the radius of curvature of the convex curve in the fast axis and less than 2.5 times the radius of curvature of the convex curve in the fast axis.

9. The laser of claim 5, wherein the first face comprises a concave arc face having a radius of curvature greater than a radius of curvature of the convex arc face.

10. The laser device as claimed in claim 9, wherein a ratio of a radius of curvature of the concave arc surface to a radius of curvature of the convex arc surface is in a range of 1.5 to 4.

11. The laser of claim 1, wherein the laser light emitted by the light emitting assembly enters the collimating lens through a first face of the collimating lens and exits the collimating lens through a second face of the collimating lens;

the first surface of the collimating lens is a plane, the second surface of the collimating lens comprises a convex cambered surface, the convex cambered surface is a free-form surface, and the curvature radius of the convex cambered surface on the slow axis is larger than that on the fast axis.

12. The laser of claim 11, wherein the convex curved surface satisfies: the range of the curvature radius on the slow axis is 3.5 mm-4 mm, and/or the range of the curvature radius on the fast axis is 3.1-3.3 mm.

13. The laser according to any one of claims 1 to 4, wherein the plurality of light emitting elements includes a first light emitting element for emitting laser light of a first color and a second light emitting element for emitting laser light of a second color, and a divergence angle of the laser light of the first color is smaller than a divergence angle of the laser light of the second color;

the reduction amount of the divergence angle of the incident laser light by the collimating lens corresponding to the first light emitting assembly is smaller than the reduction amount of the divergence angle of the incident laser light by the collimating lens corresponding to the second light emitting assembly.

14. The laser of any one of claims 1 to 4, wherein the collimating lens assembly is integrally formed.

Technical Field

The application relates to the field of photoelectric technology, in particular to a laser.

Background

With the development of the optoelectronic technology, the laser is widely used.

In the related art, as shown in fig. 1, a laser device 00 includes a package 001, a plurality of light emitting elements 002, an annular sealing cover plate 003, a light-transmissive sealing layer 004, and a collimator lens group 005. Wherein, one side of the tube shell 001 has an opening, and the plurality of light emitting components 002 are located in the accommodating space of the tube shell 001. The outer edge of the sealing cover plate 003 is fixed at the side of the opening of the tube shell 001, the edge of the light-transmitting sealing layer 004 is fixed with the inner edge of the sealing cover plate 003, and the edge of the collimating lens group 005 is fixed at the outer edge of the sealing cover plate 003 away from the surface of the tube shell 001. The surface of the collimating lens group 005 close to the sealing cover plate 003 is a plane, and the surface far from the sealing cover plate 003 includes a plurality of convex arc surfaces corresponding to the plurality of light emitting elements 002 one to one, and each convex arc surface may be a portion of a spherical surface. The part of the collimating lens group 005 where each convex arc surface is located can be used as a collimating lens T, each light emitting component 002 emits laser to the corresponding collimating lens T, and the collimating lens T is used for collimating the incident laser and then emitting the collimated laser.

However, the collimating lens in the related art has a poor collimating effect on the laser light.

Disclosure of Invention

The application provides a laser, can solve the relatively poor problem of collimation nature of the laser that the laser jetted out. The laser includes:

the pipe shell is provided with an opening on one surface;

the light-emitting components are positioned in the accommodating space of the tube shell;

the light-transmitting sealing component is positioned on the side of the opening of the tube shell;

the collimating lens group is positioned on one side of the light-transmitting sealing component, which is far away from the tube shell;

the edge of the collimating lens group is fixed with the surface of the outer edge of the sealing cover plate, which is far away from the bottom plate;

the collimating lens group comprises a plurality of collimating lenses which are in one-to-one correspondence with the plurality of light-emitting assemblies, each light-emitting assembly is used for emitting laser to the corresponding collimating lens, and the collimating lenses are used for reducing the divergence angle of the incident laser and enabling the divergence angle reduction of the laser on the slow axis to be smaller than that on the fast axis.

The beneficial effect that technical scheme that this application provided brought includes at least:

in the laser that this application provided, after every light emitting component sent laser to corresponding collimating lens, collimating lens can reduce the angle of divergence of this laser to this laser collimation. Because the divergence angle of the laser on the fast axis is larger than that on the slow axis, and each convex cambered surface in the collimating lens group in the related art is a part of the spherical surface, the collimating effect of each convex cambered surface on the laser on the fast axis and the slow axis is the same, and the divergence angle difference of the laser passing through the collimating lens on the fast axis and the slow axis is still larger. And collimating lens in this application embodiment can make the laser of penetrating into collimating lens on the slow axis divergence angle decrement be less than on the fast axis divergence angle decrement after through collimating lens, so laser can reduce the difference of the fast axis and the epaxial divergence angle of slow after passing collimating lens in this application, has improved the holistic collimating effect of laser that the laser instrument jetted out.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a laser provided in the related art;

fig. 2 is a schematic structural diagram of a laser provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a collimating lens provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of another collimating lens provided in the embodiments of the present application;

FIG. 5 is a schematic structural diagram of another collimating lens provided in the embodiments of the present application;

FIG. 6 is a schematic structural diagram of another collimating lens provided in the embodiments of the present application;

FIG. 7 is a schematic diagram of a collimating lens according to another embodiment of the present application;

FIG. 8 is a schematic diagram of another collimating lens according to another embodiment of the present application;

FIG. 9 is a schematic structural diagram of a collimating lens group provided in an embodiment of the present application;

FIG. 10 is a schematic structural diagram of another collimating lens group provided in the embodiment of the present application;

FIG. 11 is a schematic structural diagram of another collimating lens group provided in the embodiment of the present application;

FIG. 12 is a schematic structural diagram of another collimating lens group provided in the embodiment of the present application;

FIG. 13 is a schematic diagram of another laser structure provided in an embodiment of the present application;

fig. 14 is a schematic structural diagram of another laser provided in an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

With the development of the photoelectric technology, the application of the laser is wider and wider, for example, the laser can be applied to the aspects of welding process, cutting process and the like, at the moment, the laser is required to emit laser with larger energy, the collimation effect of the laser emitted by the laser has larger influence on the energy of the laser, and the better the collimation effect of the laser is, the larger the energy of the laser is. The laser can also be used as a light source in laser projection or laser television, and the collimation effect of the laser emitted by the laser has a large influence on the brightness of the laser, so that the better the collimation effect of the laser is, the higher the brightness of the laser is, and the better the display effect of a display picture formed according to the laser is. The following embodiments of the present application provide a laser, which can improve the collimation of laser light emitted by the laser.

Fig. 2 is a schematic structural diagram of a laser according to an embodiment of the present disclosure. As shown in fig. 2, the laser 10 may include: an envelope 101, a plurality of light emitting elements 102, a light transmissive encapsulant (e.g., comprising an encapsulant cover 103 and a light transmissive encapsulant 104), and a set of collimating mirrors 105. The light transmissive sealing member may also be referred to as a cover member.

One surface of package 101 has an opening, package 101 may enclose a receiving space, and the plurality of light emitting elements 102 are located in the receiving space of package 101. The light-transmissive sealing member is located at the side of the opening of the package 101, and the collimating lens group 105 is located at the side of the light-transmissive sealing member away from the package 101. Alternatively, the sealing cover plate 103 in the light-transmitting sealing assembly has a ring shape, and the outer edge of the sealing cover plate 103 is fixed to the opening side of the package 101. The edge of the light transmissive sealing layer 104 is fixed to the inner edge of the sealing cover plate 103. The edge of the set of collimating mirrors 105 is fixed to the outer edge of the sealing cover 103 away from the surface of the envelope 101. Alternatively, the edge of the collimator lens group 105 may be bonded to the outer edge of the sealing cover plate 103 by an adhesive, which may include glass frit, low temperature glass solder, epoxy, or other glue.

The collimating lens group 105 includes a plurality of collimating lenses T corresponding to the plurality of light emitting elements 102 one to one, each light emitting element 102 is configured to emit laser light to the corresponding collimating lens T, and the collimating lens T is configured to collimate the incident laser light. It should be noted that, collimating the light, that is, adjusting the divergence angle of the light, makes the light adjusted to be as close to parallel light as possible. The collimator lens T can reduce the divergence angle of the injected laser light and reduce the divergence angle of the laser light in the slow axis by less than the divergence angle in the fast axis. That is, the collimating lens has a weaker collimating effect on the laser light in the slow axis than in the fast axis. Illustratively, the slow axis of the laser light directed to the collimating lens T is parallel to the x-direction in fig. 2, and the fast axis of the laser light is parallel to the direction perpendicular to the plane of the paper in fig. 2. Alternatively, the collimator lens may be made of glass.

It should be noted that the divergence angle of the laser light emitted by the light emitting assembly in the fast axis is larger than that in the slow axis, and the divergence angle of the laser light in the fast axis is different from that in the slow axis. The fast axis and the slow axis are directions of two light vectors during light transmission, and the fast axis is perpendicular to the slow axis. Illustratively, the light emitting assembly emits laser light having a divergence angle in the range of 25 degrees to 35 degrees, such as 30 degrees, in the fast axis and in the range of 5 degrees to 7 degrees, such as 7 degrees, in the slow axis. In the related art, a collimating lens in a collimating lens group includes two opposite surfaces, and in order to improve the production efficiency or the installation convenience of the collimating lens group, one of the two surfaces of the collimating lens is set as a plane, and the other surface of the collimating lens is set as a convex arc surface with the same curvature in each direction. The collimating lens can collimate the incident laser light by the action of the convex cambered surface. In the related art, the convex arc surface is a part of a spherical surface, and curvatures in all directions in the convex arc surface are equal, so that the reduction degrees of divergence angles of the convex arc surface on a fast axis and a slow axis of incident laser are the same, and the divergence angle difference of the laser passing through the collimating lens on the fast axis and the slow axis is still larger, so that the collimation of the laser emitted by the laser is poor.

In the laser provided in the embodiment of the present application, each collimating lens in the collimating lens group can make the divergence angle decrease of the incident laser on the slow axis after passing through the collimating lens smaller than the divergence angle decrease on the fast axis, that is, the collimating effect of the collimating lens on the slow axis of the laser is weaker than the collimating effect on the fast axis. Because the divergence angle of the laser shot to the collimating lens on the fast axis is larger than that on the slow axis, the difference of the divergence angles on the fast axis and the slow axis can be reduced after the laser passes through the collimating lens in the application, and the integral collimation effect of the laser shot by the laser is improved.

To sum up, in the laser provided in the embodiment of the present application, after each light emitting component emits laser to the corresponding collimating lens, the collimating lens can reduce the divergence angle of the laser, so as to collimate the laser. Because laser is greater than the angle of divergence on the slow axis at the angle of divergence of fast epaxial laser, collimating lens in this application embodiment can make the laser of inciding into collimating lens diverge the angle reduction and be less than the angle of divergence reduction on the fast axis on the slow axis after through collimating lens, so laser can reduce the difference of the angle of divergence on fast axis and the slow axis after passing collimating lens in this application, has improved the holistic collimating effect of laser that the laser instrument jetted out.

With continued reference to fig. 2, the collimating lens T has a first surface D1 and a second surface D2, the first surface D1 and the second surface D2 are opposite surfaces of the collimating lens, and the first surface D1 is close to the package 101 relative to the second surface D2. The laser light emitted by the light emitting assembly 102 is transmitted through the light-transmitting sealing layer 104 to the corresponding collimating lens T, and is transmitted to the collimating lens T through the first surface D1 of the collimating lens T; and further travels in the collimator lens T to exit the collimator lens T through the second face D2 of the collimator lens T. The first surface D1 is a light incident surface of the collimating lens T, and the second surface D2 is a light emitting surface of the collimating lens T. The adjustment characteristics of the divergence angle and the propagation direction of the incident laser beam by the collimator lens T may be determined by the curvatures of the first surface D1 and the second surface D2. There is also a difference in the shape of the collimating lens under the different curvatures of the first and second faces D1 and D2.

In the embodiment of the application, the divergence angle reduction of the incident laser on the slow axis can be smaller than that on the fast axis by the collimating lens in the collimating lens group through various optional implementation modes, so that the divergence angle difference of the laser emitted from the collimating lens on the fast axis and the slow axis is smaller, and the collimation degree of the laser is improved. Two realizations thereof are explained below as examples.

In a first alternative implementation manner of the collimating lens, the first surface D1 of the collimating lens T is used for expanding the divergence angle of the incident laser light on the slow axis; the second surface D2 is used to reduce the divergence angle of the injected laser light in both the fast axis and the slow axis.

Fig. 3 is a schematic structural diagram of a collimating lens provided in an embodiment of the present application, fig. 4 is a schematic structural diagram of another collimating lens provided in an embodiment of the present application, and fig. 4 may be a top view of the laser shown in fig. 3. As shown in fig. 3 and 4, the collimating lens T has a cylindrical shape, the first surface D1 of the collimating lens T includes a concave arc surface, and the first surface D1 includes a concave arc surface, which serves to enlarge the divergence angle of the laser light on the slow axis. The second surface D2 includes a convex curved surface that serves to reduce the divergence angle of the injected laser light in both the fast axis and the slow axis. The first plane D1 and the second plane D2 each have various ways to achieve this adjustment of the divergence angle of the laser light.

In a first alternative implementation manner of the first surface D1, please refer to fig. 3 and 4, the concave arc surface in the first surface D1 has a curvature in both the slow axis (x direction) and the fast axis (y direction) of the incident laser light, and the curvature radius of the concave arc surface in the slow axis is smaller than that in the fast axis. Since the curvature of the arc surface is the reciprocal of the radius of curvature, the curvature of the concave arc surface in the first surface D1 is larger in the slow axis than in the fast axis of the incident laser light, and the curvature of the concave arc surface is larger in the slow axis than in the fast axis. A curved surface having different radii of curvature in different directions may also be referred to as a free-form surface, and the convex curved surface may resemble a part-spherical surface of a football.

It should be noted that the concave arc surface of the lens has a diffusion effect on the incident light, and the larger the curvature radius of the concave arc surface is, the smaller the bending degree of the concave arc surface is, and further, the weaker the diffusion effect of the concave arc surface on the light is, the smaller the diffusion amount of the diffusion angle of the light is. In the embodiment of the application, the curvature radius of the concave arc surface of the collimating lens on the slow axis of the incident laser is smaller than that on the fast axis, so that after the laser emitted by the light emitting component passes through the concave arc surface of the collimating lens, the expansion amount of the divergence angle of the laser on the fast axis is smaller than that on the slow axis. Because the divergence angle of the laser emitted by the light emitting component on the fast axis is larger than that on the slow axis originally, the divergence angle of the laser on the slow axis is smaller than that on the fast axis after the laser passes through the concave cambered surface of the collimating lens. Compared with the divergence angle after the laser penetrates into the collimating lens in the prior art, in the embodiment of the application, after the laser penetrates through the concave cambered surface, the divergence angle of the laser on the fast axis can be increased by 1.1-1.5 degrees, and the divergence angle of the laser on the slow axis can be increased by 1.5-2.5 degrees, so that the angle difference of the laser on the fast axis and the slow axis can be reduced.

Fig. 3 and 4 take as an example that the first surface D1 is a concave arc surface and the second surface D2 is a convex arc surface in the collimator lens T, that is, the concave arc surface includes the entire region of the first surface D1, and the convex arc surface includes the entire region of the second surface D2. Optionally, fig. 5 is a schematic structural diagram of another collimating lens provided in an embodiment of the present application. As shown in fig. 5, only a partial region of the first surface D1 may be a concave arc surface. Alternatively, only a partial region of the second surface D2 may be a convex arc surface. The laser light may be directed to only a partial region in the first face D1 and emitted from a partial region in the second face D2; only a partial region of the first surface D1 on which the laser beam is emitted may be a concave curved surface, and only a partial region of the second surface D2 on which the laser beam is emitted may be a convex curved surface.

In a second alternative implementation manner of the first surface D1, fig. 6 is a schematic structural diagram of another collimating lens provided in an embodiment of the present application, and fig. 6 may be a top view of fig. 3 or fig. 5. Referring to fig. 3 and fig. 6, or fig. 5 and fig. 6, the concave arc surface in the first surface D1 of the collimating lens T may be a cylindrical surface (cylinder), that is, the concave arc surface is a concave cylindrical surface, and a straight generatrix of the cylindrical surface is parallel to a fast axis of the laser beam incident on the concave arc surface (e.g., parallel to the y direction in fig. 6). The cylindrical surface is a curved surface formed by parallel translation of a straight line along a fixed curve, and the moving straight line is referred to as a straight generatrix of the cylindrical surface. If the cylinder is part of a side of a cylinder, the straight generatrix of the cylinder is parallel to the height direction of the cylinder. The curvature of the concave cylinder surface on the fast axis of the injected laser is 0, the curvature radius is infinite, and the curvature of the concave cylinder surface on the slow axis of the injected laser is greater than 0.

It should be noted that the concave cylindrical surface is approximately planar on the fast axis of the laser beam incident on the concave cylindrical surface, the change amount of the divergence angle of the laser beam incident on the concave cylindrical surface on the fast axis is similar to the change amount of the divergence angle of the laser beam incident on the plane glass, and the divergence angle of the laser beam on the fast axis is basically unchanged. The bending degree of the concave cambered surface is larger on the slow axis of the laser which is injected into the concave cambered surface, and the diffusion quantity of the divergence angle of the laser on the slow axis is larger. After passing through the first surface D1, the virtual image size of the laser light on the slow axis becomes smaller, and the divergence angle becomes larger. As shown in fig. 3 or 5, the divergence angle of the laser light in the slow axis is enlarged after the laser light is injected into the concave cylinder, and as shown in fig. 6, the divergence angle of the laser light in the fast axis is not substantially enlarged after the laser light is injected into the concave cylinder. Thus, when the laser light is transmitted through the collimating lens and is directed to the convex arc in the second surface D2, the divergence angle in the slow axis is less different from the divergence angle in the fast axis.

Alternatively, the curvature radius of the concave arc surface in the collimating lens on the slow axis of the incident laser light may be in a range of 50 mm to 120 mm, for example, the curvature radius may be 109 mm. Optionally, compared with the divergence angle of the laser after entering the collimating lens in the prior art, in the embodiment of the present application, after the laser passes through the concave arc surface, the divergence angle of the laser on the slow axis may be increased by 1.5 degrees to 2.5 degrees, so that the angle difference of the laser on the fast axis and the slow axis may be reduced.

The laser light entering the collimating lens can be emitted through the convex arc surface in the second surface D2 of the collimating lens after the divergence angles of the laser light on the fast axis and the slow axis are adjusted by the concave arc surface in the first surface D1 of the collimating lens, or the divergence angle of the laser light on the slow axis is adjusted. The convex cambered surface can further collimate the injected laser, so that the collimation effect of the laser emitted from the collimating lens is better.

In a first alternative implementation of the second surface D2, the curvature of the convex arc surface in the second surface D2 on the slow axis and the fast axis of the injected laser light is the same, e.g., the convex arc surface is a portion of a spherical surface. Because the concave cambered surface through collimating lens can make the fast axle of laser and the angle of divergence on the slow axle differ less already, so this convex cambered surface can only carry out holistic collimation to laser, make the degree of reducing of the angle of divergence of laser on the fast axle with the degree of reducing of the angle of divergence on the slow axle close can, so can need not to carry out different designs to the not equidirectional camber of this convex cambered surface, guarantee that collimating lens's preparation process is comparatively simple.

In a second alternative implementation of the second surface D2, the convex arc surface in the second surface D2 is a free-form surface, and the curvature radius of the convex arc surface in the slow axis of the injected laser is larger than that in the fast axis, and the curvature of the convex arc surface in the slow axis of the injected laser is smaller than that in the fast axis. It should be noted that the convex arc surface of the lens has a converging effect on the incident light, and the smaller the curvature radius of the convex arc surface is, the larger the bending degree of the convex arc surface is, and further, the stronger the converging effect of the convex arc surface on the light is, the larger the reduction of the divergence angle of the light is. So this convex cambered surface can adjust the laser divergence angle of penetrating respectively again on fast axle and slow axle, makes the degree of reducing of the laser divergence angle on slow axle be less than the degree of reducing of the laser divergence angle on fast axle, further reduces the difference of the laser divergence angle on fast axle and slow axle that collimating lens jetted out. Therefore, the convex arc surface collimates the injected laser, and the collimation effect of the laser emitted from the collimating lens is better. As shown in fig. 3 to 6, after the laser light exits the convex arc surface of the collimating lens, the laser light approaches parallel light on both the fast axis and the slow axis.

Optionally, in a second alternative implementation manner of the second surface D2, the curvature radius of the convex arc surface in the collimating lens on the fast axis of the incident laser may range from 2.592 mm to 3.888 mm, that is, from 3.24 (1-0.2) mm to 3.24 (1+0.2) mm. Optionally, the radius of curvature of the convex arc surface on the fast axis of the incident laser may also range from 3.24 (1-0.1) mm to 3.24 (1+0.1) mm. The curvature radius of the convex cambered surface on the slow axis of the injected laser ranges from 2.608 mm to 3.924 mm; or 2.608 mm to 3.912 mm, i.e. 3.26 (1-0.2) mm to 3.26 (1+0.2) mm. Optionally, the curvature radius of the convex arc surface on the fast axis of the incident laser may also range from 3.26 (1-0.1) mm to 3.26 (1+0.1) mm. Optionally, in the embodiment of the present application, the radius of curvature of the convex arc surface on the slow axis of the injected laser is less than 1.2 times the radius of curvature on the fast axis. I.e. the difference between the radius of curvature of the convex curve in the slow axis and the radius of curvature in the fast axis is less than 20% of the radius of curvature in the fast axis. Alternatively, the difference may be less than 10% of the radius of curvature in the fast axis.

Optionally, in this embodiment of the application, a required focal length of the collimating lens may be set first, and then specific parameters of the collimating lens are determined based on the focal length. Such as the radius of curvature of the convex curve in the collimating lens in the slow and fast axes of the incident laser light, and the radius of curvature of the concave curve. The focal length of the collimating lens on the fast axis of the injected laser can be more than half of the curvature radius of the convex cambered surface in the collimating lens on the fast axis and less than 2.5 times of the curvature radius of the convex cambered surface on the fast axis. For example, the above exemplary parameters, that is, the curvature radius of the convex arc surface of the collimating lens on the slow axis and the fast axis of the incident laser light, and the curvature radius of the concave arc surface on the slow axis of the incident laser light, may be parameters when the focal length of the collimating lens on the fast axis of the incident laser light is set to be 6 mm. When other values of the focal length of the collimating lens are required, the specific parameters of the radius of curvature described above can be adjusted accordingly. The respective radii of curvature can be adjusted isocratically, as can the change in the focal length. For example, when the focal length of the collimating lens on the fast axis of the incident laser is 6 mm, the radius of curvature of the convex cambered surface in the collimating lens on the fast axis of the incident laser is 3.24 mm; if the focal length of the collimating lens on the fast axis of the incident laser is 12 mm, the radius of curvature of the convex cambered surface in the collimating lens on the fast axis of the incident laser is 6.48 mm.

In the embodiment of the present application, the two optional implementations of the first surface D1 of the collimating lens T may be combined with the two implementations of the second surface D2 at will, so that four collimating lenses with different shapes may be obtained. In the first kind of collimating lens, first face and second face all include free-form surface, and in the second kind of collimating lens, first face includes concave cylinder and second face includes convex free-form surface, and in the third kind of collimating lens, first face includes free-form surface and second face includes the sphere, and in the fourth kind of collimating lens, first face includes concave cylinder and second face and includes the sphere. In the four kinds of collimating lenses, the curvature radius of the concave arc surface in the first surface and the curvature radius of the convex arc surface in the second surface can satisfy a certain relationship, so that a better collimating effect of the collimating lens on the injected laser is ensured.

Optionally, the curvature radius of the concave arc surface in the collimating lens may be larger than the curvature radius of the convex arc surface, for example, the ratio of the curvature radius of the concave arc surface to the curvature radius of the convex arc surface ranges from 1.5 to 4. For example, for the first and second collimating lenses, the radius of curvature of the concave curved surface in both the fast axis and the slow axis of the injected laser light may be larger than the radius of curvature of the convex curved surface in both the fast axis and the slow axis. For the third and fourth collimating lenses, the concave arc surface in the collimating lens is a concave cylindrical surface, that is, the concave arc surface is only curved on the slow axis of the injected laser, and the curvature radius of the concave arc surface may refer to the curvature radius of the concave arc surface on the slow axis. The ratio range of the curvature radius of the concave cambered surface on the slow axis of the injected laser to the curvature radius of the convex cambered surface on the slow axis and the fast axis can be 1.5-4. Alternatively, the focal length of the entire collimator lens may be greater than 0, and the focal length f is 1/R2-1/R1, where R2 denotes the radius of curvature of the convex curved surface in the collimator lens, and R1 denotes the radius of curvature of the concave curved surface in the collimator lens.

In the embodiment of the application, the curvature radius of the concave cambered surface in the collimating lens on the fast axis of the injected laser can be larger than the curvature radius of the convex cambered surface on the fast axis; the radius of curvature of the concave curved surface in the slow axis of the injected laser light may be larger than the radius of curvature of the convex curved surface in the slow axis. Therefore, the whole collimating lens can be ensured to be used for collimating and converging light rays, namely, the divergence angle of the laser light emitted out of the collimating lens is smaller than that of the laser light incident into the collimating lens. It should be noted that the concave curved surface can only reduce the difference between the divergence angles of the incident laser light in the slow axis and the fast axis to some extent, but it is difficult to make the divergence angles of the laser light in the slow axis and the fast axis the same. Therefore, the laser beam finally emitted from the collimating lens needs to be further adjusted through the convex arc surface so as to ensure the consistency of the collimating effect of the laser beam in different directions.

In a first optional implementation manner of the collimating lens, after each light emitting assembly emits laser to the corresponding collimating lens, the laser enters the collimating lens through a first surface of the collimating lens, and the first surface can diffuse the laser according to a divergence angle of the laser on a slow axis. Because the divergence angle of the laser emitted by the light-emitting component on the fast axis is larger than that on the slow axis, the difference between the divergence angle of the laser on the fast axis and the divergence angle of the laser on the slow axis can be reduced after the laser passes through the first surface. The laser can be emitted out of the collimating lens through the second surface of the collimating lens, the divergence angle of the laser on the fast axis can be greatly shrunk through the second surface, and then the difference of the divergence angle of the laser on the fast axis and the divergence angle of the laser on the slow axis after the laser passes through the collimating lens can be further reduced, so that the integral collimation effect of the laser emitted by the laser is improved.

In a second alternative implementation manner of the collimating lens, fig. 7 is a schematic structural diagram of a collimating lens provided in another embodiment of the present application, fig. 8 is a schematic structural diagram of another collimating lens provided in another embodiment of the present application, and fig. 8 may be a top view of fig. 7. As shown in fig. 7 and 8, the first surface D1 of the collimating lens is a plane surface, and the second surface D2 of the collimating lens has a convex arc surface; the convex arc surface is a free-form surface, and the curvature radius of the convex arc surface on the slow axis of the injected laser is larger than that on the fast axis, as shown in fig. 7, the curvature radius of the convex arc surface is larger than that of the convex arc surface in fig. 8. Optionally, the convex arc surface satisfies: the radius of curvature in the slow axis of the injected laser light ranges from 3.5 mm to 4 mm, and/or the radius of curvature in the fast axis of the injected laser light ranges from 3.1 mm to 3.3 mm. For example, the radius of curvature of the convex curved surface on the fast axis of the injected laser may be 3.282 mm.

It should be noted that the smaller the radius of curvature of the convex curved surface, the greater the degree of curvature of the convex curved surface, and the better the converging effect of the convex curved surface on the laser light. In the embodiment of the present application, since the first surface of the collimating lens is a plane, the change degree of the divergence angle of the first surface facing the incident laser on the slow axis is the same as the change degree of the divergence angle on the fast axis, and after the laser is incident on the first surface of the collimating lens, the difference between the divergence angle of the laser on the fast axis and the divergence angle on the slow axis is still large, so that the difference between the divergence angle of the laser on the fast axis and the divergence angle on the slow axis of the laser incident on the convex arc surface of the collimating lens is still large. Because the curvature radius of the convex cambered surface of the collimating lens on the slow axis of the incident laser is larger than that on the fast axis, the converging effect of the convex cambered surface on the fast axis of the incident laser is stronger than that on the slow axis, and the difference of the divergence angles of the laser emitted by the collimating lens (namely the laser emitted by the convex cambered surface) on the fast axis and the slow axis is further reduced.

Optionally, in the embodiment of the present application, the width of the collimating lens in the fast axis (e.g., y direction) of the incident laser light is greater than the width of the collimating lens in the slow axis (e.g., x direction), and a top view of each collimating lens may be rectangular. The light spot of the laser emitted by the light emitting component is in an oval shape when the laser emits to the collimating lens, the long axis of the oval light spot can be parallel to the long side direction of the rectangular collimating lens, and the short axis of the oval light spot can be parallel to the short side direction of the rectangular collimating lens. So, can guarantee that the facula shape of directive collimating lens is higher with the matching degree of collimating lens's shape, on the basis of guaranteeing the equal directive collimating lens of laser, avoid collimating lens's size extravagant, be favorable to the miniaturization of laser instrument.

Two alternative implementations of the collimating lens group are explained below with reference to the drawings:

in an alternative implementation manner of the collimating lens group, fig. 9 is a schematic structural diagram of a collimating lens group provided in the embodiment of the present application, fig. 10 is a schematic structural diagram of another collimating lens group provided in the embodiment of the present application, fig. 11 is a schematic structural diagram of another collimating lens group provided in the embodiment of the present application, and both fig. 10 and fig. 11 can be right views of the collimating lens group shown in fig. 9. The collimating lens assembly 105 can be integrally formed. The collimating lens assembly 105 can have an incident surface M1 and an exit surface M2, the incident surface M1 and the exit surface M2 are two opposite surfaces of the collimating lens assembly 105, and the incident surface M1 is close to the package 101 relative to the exit surface M2. The light incident surface M1 of the collimating lens group 105 includes a first surface D1 of each collimating lens in the collimating lens group 105, and the light emergent surface M2 includes a second surface D2 of each collimating lens. In the first optional implementation manner of the collimating lens, as shown in fig. 10, the light incident surface M1 of the collimating lens group 105 has a plurality of concave arc surfaces, the light emergent surface M2 of the collimating lens group 105 has a plurality of convex arc surfaces, and a portion where each concave arc surface and the corresponding convex arc surface in the collimating lens group 105 are located is a collimating lens T. Alternatively, the orthographic projection of each convex arc surface on the light entrance surface of the collimating mirror group 105 may coincide with the orthographic projection of the corresponding convex arc surface on the light entrance surface. In the second optional implementation manner of the collimating lens set, as shown in fig. 11, the light incident surface of the collimating lens set 105 is a plane, the light emergent surface M2 of the collimating lens set 105 has a plurality of convex arc surfaces, and a portion of the collimating lens set 105 where each convex arc surface is located is a collimating lens T.

In another alternative implementation manner of the collimating lens group, fig. 12 is a schematic structural diagram of another collimating lens group provided in the embodiment of the present application. As shown in fig. 12, the collimator lens group 105 may also be composed of a plurality of individual collimator lenses T. For example, the laser may further include a support frame K, an edge of the support frame may be fixed to a surface of the outer edge of the sealing cover plate away from the package, the support frame may have a plurality of hollow areas (not shown), and each collimating lens T in the collimating lens group 105 may cover one of the plurality of hollow areas. The plurality of hollow-out areas can correspond to the plurality of light-emitting components in the laser one by one, and laser emitted by each light-emitting component can penetrate through the corresponding hollow-out area to shoot to the collimating lens T covering the hollow-out area.

In the embodiment of the present application, the Laser 10 may be a multi-chip Laser Diode (MCL) type Laser, and the plurality of light emitting elements in the Laser may be arranged in a plurality of rows and a plurality of columns in the package. Fig. 13 is a schematic structural diagram of another laser provided in an embodiment of the present application. Fig. 13 may be a top view of fig. 2, fig. 13 does not illustrate the light transmissive sealing assembly and the collimating mirror group in the laser, and fig. 2 may be a schematic view of a section a-a' in fig. 13. As shown in fig. 13, a plurality of light emitting elements 102 in the laser 10 may be arranged in an array, and fig. 13 exemplifies that the laser 10 includes 20 light emitting elements 102, and the light emitting elements 102 are arranged in four rows and five columns. Alternatively, the number of the light emitting assemblies 102 in the laser 10 may be other numbers, and the plurality of light emitting assemblies 102 in the laser 10 may be arranged in other manners, for example, the laser 10 may include 28 light emitting assemblies 102 arranged in four rows and seven columns, or 25 light emitting assemblies 102 arranged in five rows and five columns.

The laser in the embodiment of the present application may be a monochromatic MCL laser, or may also be a multicolor MCL laser. Each light emitting component in the monochromatic MCL laser emits light with the same color, and parameters of each collimating lens in the collimating lens group can be the same. Multiple types of light emitting elements may be included in a multi-color MCL laser, and different types of light emitting elements may emit different colors of light. Alternatively, for a polychromatic MCL laser, the set of collimating lenses may comprise a plurality of collimating lenses of different parameters. The divergence angles of the laser lights emitted by the different types of light emitting assemblies may be different, and the corresponding collimating lenses in the collimating lens group may be designed based on the divergence angles of the laser lights emitted by the respective light emitting assemblies. Alternatively, for a multi-color MCL laser, the parameters of the individual collimating lenses in the set of collimating lenses may also be the same.

In the embodiment of the present application, taking the laser as a multi-color MCL laser as an example, the plurality of light emitting assemblies 102 in the laser may include a first light emitting assembly for emitting laser light of a first color, and a second light emitting assembly for emitting laser light of a second color, where a divergence angle of the laser light of the first color is smaller than a divergence angle of the laser light of the second color. The set of collimating mirrors 105 can satisfy: the reduction amount of the divergence angle of the incident laser by the collimating lens corresponding to the first light-emitting assembly is smaller than the reduction amount of the divergence angle of the incident laser by the collimating lens corresponding to the second light-emitting assembly. The curvature radius of the concave cambered surface in the collimating lens corresponding to the first light-emitting assembly can be smaller than that of the concave cambered surface in the collimating lens corresponding to the second light-emitting assembly; and/or the radius of curvature of the convex cambered surface in the collimating lens corresponding to the first light-emitting assembly can be larger than the radius of curvature of the concave cambered surface in the collimating lens corresponding to the second light-emitting assembly.

Illustratively, the first color may include blue and green, and the first light emitting element may include a blue light emitting element and a green light emitting element; the second color may be red and the second light emitting element may be a red light emitting element. The divergence angle of the red laser light emitted by the red light emitting assembly can be larger than the divergence angle of the blue laser light emitted by the blue light emitting assembly, and is larger than the divergence angle of the green laser light emitted by the green light emitting assembly. Alternatively, the divergence angles of the red laser light in both the fast axis and the slow axis may be larger than the divergence angles of the green laser light and the blue laser light in both the fast axis and the slow axis. Or the divergence angle of the red laser on the fast axis is larger than the divergence angles of the green laser and the blue laser on the fast axis, the divergence angle of the red laser on the slow axis is larger than the divergence angles of the green laser and the blue laser on the slow axis, but the divergence angle of the red laser on the slow axis is smaller than the divergence angles of the blue laser and the green laser on the fast axis. According to the divergence angles of the red laser, the blue laser and the green laser on the fast axis and the slow axis, the reduction of the divergence angle of the collimation lens corresponding to the light emitting component emitting the laser of each color to the laser can be correspondingly adjusted, such as adjusting the curvature radius of the convex cambered surface of the collimation lens on the fast axis and the slow axis.

Illustratively, the divergence angle of the blue laser light in the fast axis is larger than the divergence angle of the red laser light in the slow axis and smaller than the divergence angle of the red laser light in the fast axis of the injected laser light. At this time, if the collimating lens in the collimating lens group adopts the first implementation manner, the curvature radius of the concave arc surface in the collimating lens to which the blue laser beam is directed on the slow axis may be larger than the curvature radius of the concave arc surface in the collimating lens to which the red laser beam is directed on the slow axis, and smaller than the curvature radius of the concave arc surface in the collimating lens to which the red laser beam is directed on the fast axis. Or the curvature radius of the convex cambered surface in the collimating lens to which the blue laser irradiates on the slow axis is smaller than the curvature radius of the convex cambered surface in the collimating lens to which the red laser irradiates on the slow axis and is larger than the curvature radius of the concave cambered surface in the collimating lens to which the red laser irradiates on the fast axis. If the collimating lens in the collimating lens group adopts the second implementation manner, the curvature radius of the convex arc surface in the collimating lens to which the blue laser irradiates on the fast axis may be larger than the curvature radius of the convex arc surface in the collimating lens to which the red laser irradiates on the fast axis, and smaller than the curvature radius of the convex arc surface in the collimating lens to which the red laser irradiates on the slow axis. For other size relationships of the divergence angles of the laser light of each color, the analogy can be performed, and the description of the embodiment of the application is omitted.

In the embodiment of the application, a plurality of light emitting points can exist in a red light emitting assembly in a laser, the size of a light spot of red laser emitted by each red light emitting assembly on a fast axis can reach 350 micrometers, only one light emitting point can exist in a blue light emitting assembly and a green light emitting assembly, the size of the light spot of the laser emitted by the blue light emitting assembly and the laser emitted by the green light emitting assembly on the fast axis can be about 35 micrometers, and the size of the laser emitted by each light emitting assembly on a slow axis is about 1 micrometer. Therefore, the light spot of the laser emitted by each light-emitting component in the laser is flat and long. After the laser is emitted through the collimating lens, the length-width ratio of a formed light spot can be reduced.

Fig. 14 is a schematic structural diagram of another laser provided in an embodiment of the present application, and fig. 14 may be a schematic diagram of a section b-b' in fig. 13. Referring to fig. 2, 13 and 14, the tube housing 101 may include a bottom plate 1011 and a circular sidewall 1012 fixed on the bottom plate 1011, wherein the bottom plate 1011 and the sidewall 1012 form a receiving space of the tube housing 101. The opening in the side wall 1012 away from the base 1011 is the opening in the housing 101. Each light emitting assembly 102 may include a light emitting chip 1021, a heat sink 1022, and a reflective prism 1023. A heat sink 1022 may be disposed on the bottom plate 1011 of the package 101, the light emitting chip 1021 may be disposed on the heat sink 1022, the heat sink 1022 serves to assist the light emitting chip 1021 in heat dissipation, and the reflective prism 1023 may be located at a light emitting side of the light emitting chip 1021. The laser light emitted from the light emitting chip 1021 can be emitted to the reflective prism 1023, and then reflected on the reflective prism 1023 to pass through the light-transmissive sealing layer 104 to be emitted to the collimating lens group 105, and emitted to the collimating lens T corresponding to the light emitting element 102 in the collimating lens group 105 where the light emitting chip 1021 is located.

Optionally, a plurality of light emitting chips in the laser are arranged in an array, a plurality of collimating lenses in the collimating lens group are also arranged in an array, the row direction of the light emitting chips is the same as the row direction of the collimating lenses, and the column direction of the light emitting chips is the same as the column direction of the collimating lenses. The light emitting direction of each light emitting chip can be perpendicular to the row direction of the plurality of light emitting chips, that is, parallel to the column direction of the plurality of light emitting chips. The slow axis of the laser light emitted by the light emitting chip may be parallel to the row direction. When the laser irradiates the collimating lens group, the slow axis is parallel to the row direction of the collimating lenses, and the fast axis is parallel to the column direction of the collimating lenses.

Referring to fig. 13 and 14, the light emitting chip 1021 may have a rectangular parallelepiped shape, and laser light is emitted from an end face G of the light emitting chip 1021 opposite to the corresponding reflecting prism 1023. The actual light exit area in the end face G may be rectangular, for example the rectangle may be greater than 10 microns long, for example 200 microns, and may be about 1 micron wide. The length direction of the rectangular light emitting area may be parallel to the plate surface of the bottom plate 1011, and the width direction may be perpendicular to the plate surface of the bottom plate 1011. The fast axis of the laser light emitted from the light emitting chip 1021 may be parallel to the width direction, and the slow axis of the laser light may be parallel to the length direction. If the laser may have a divergence angle of 30 degrees in the fast axis and 7 degrees in the slow axis.

Illustratively, the collimation effect of the collimating lens on the laser light in a certain direction is related to the width of the light outgoing area of the laser light in the direction. Y denotes a width of the light region, f denotes a focal length of the collimator lens, and Q denotes a divergence angle of the laser light emitted from the light exit region after passing through the collimator lens. As for the collimation effect of the collimating lens on the laser light on the slow axis in the embodiment of the present application, Y is 200 micrometers to 0.2 mm, and f is 6 mm, and then Q ≈ 1 can be obtained. For the collimation effect of the collimating lens on the laser on the fast axis, the obtained Q is close to 0 because the Y value is too small. Therefore, if the laser emitted by the light emitting chip is collimated by only using the collimating lenses with the same curvature on the slow axis and the fast axis, the divergence angle on the slow axis is still about 1 degree when the divergence angle on the fast axis is reduced to ensure that the laser is collimated on the fast axis, which is not favorable for shaping and subsequent propagation of the laser. In the embodiment of the application, the first surface can be set to be a concave cylindrical surface, a free-form surface or a plane, the second surface is set to be a collimating lens of the free-form surface, the divergent angle of the laser in the slow axis direction and the divergent angle of the laser in the fast axis direction can be respectively adjusted, and the reshaping and the collimating effect of the collimating lens on the laser can be improved.

The following describes the package and the light-transmitting sealing assembly in the laser according to the embodiment of the present application:

alternatively, the floor and side walls of the enclosure may be of unitary construction, or may be separate structures, welded together to form the enclosure. The material of this tube shell in this application embodiment can be copper, for example oxygen-free copper, and the material of this printing opacity sealing layer can be glass, and the material of this sealed apron can be stainless steel. It should be noted that, the coefficient of heat conductivity of copper is great, and the material of tube in this application embodiment is copper, so can guarantee that the light emitting component who sets up on the bottom plate of tube can conduct through the tube fast at the heat that the during operation produced, and then very fast giveaway, avoids heat to gather the damage to light emitting component. Optionally, the material of the package may be one or more of aluminum, aluminum nitride and silicon carbide. The material of the sealing cover plate in the embodiment of the present application may also be other kovar materials, such as iron-nickel-cobalt alloy or other alloys. The material of the light-transmitting sealing layer may also be other materials with light-transmitting and high reliability, such as resin materials.

With continued reference to fig. 2, 13 and 14, the thickness of the outer edge of the sealing cover plate 103 in the light-transmitting sealing assembly, which is thinner than the predetermined thickness threshold, may be smaller than the predetermined thickness threshold, and the outer edge may be fixed to the opening side of the package 101 by a parallel sealing technique. For example, the outer edge of the sealing cover 103 may be secured to the surface of the side wall 1012 remote from the base 1011 by a parallel seal technique. Alternatively, the sealing cover plate 103 may be a sheet metal part, and the thickness of each position of the sealing cover plate 103 is the same or approximately the same. The inner edge of the sealing cover plate 103 may be recessed toward the bottom plate 1011 relative to the outer edge. The sealing cover plate 103 may be manufactured by a sheet metal process, for example, an annular plate-shaped structure may be stamped, so that a proper position in the plate-shaped structure is bent, recessed or raised, so as to obtain the sealing cover plate provided in the embodiment of the present application.

The light transmissive sealing layer 104 may have a plate-like structure. The plate-like structure may comprise two parallel larger surfaces and a plurality of smaller sides connecting the two surfaces, the sides of the light transmissive sealing layer 104 may be fixed to the inner edge of the sealing cover plate 103 by a sealing glue. In this application embodiment, the printing opacity sealing layer can be directly fixed with sealed apron, and perhaps the laser instrument can also include the carriage that is used for supporting the printing opacity sealing layer, and the printing opacity sealing layer can be fixed with this carriage earlier, and then this carriage is fixed with sealed apron again. For example, the supporting frame may be a frame shaped like a Chinese character 'mu', so that the middle region of the light-transmitting sealing layer may be supported by the supporting frame, and the setting firmness of the light-transmitting sealing layer may be improved. Optionally, a brightness enhancement film may be attached to at least one of the surface close to the substrate and the surface far from the substrate of the light-transmitting sealing layer to improve the light-emitting brightness of the laser.

The package 101, the sealing cover 103 and the light-transmitting sealing layer 104 may form a sealed space, so that the light emitting element 102 may be in the sealed space to prevent water and oxygen from corroding the light emitting element 102. And because the risk of cracking of the light-transmitting sealing layer 104 due to heat generated during the operation of the light-emitting element 102 is reduced, the sealing effect of the sealed space can be ensured, and the service life of the light-emitting element can be further prolonged.

In the embodiment of the present application, when the outer edge of the sealing cover plate 103 and the package 101 are fixed by the parallel sealing technique, the sealing cover plate 103 is placed on the side of the opening of the package 101, and the outer edge of the sealing cover plate 103 overlaps the surface of the sidewall 1012 of the package 101 away from the bottom plate 1011. The outer edge then needs to be heated by a sealing device to melt the position of the connection of the outer edge to the side wall 1012 and to weld the outer edge to the side wall of the case 101. Alternatively, the light-transmissive sealing layer 104 may be fixed to the sealing cover 103 before the sealing cover 103 is fixed to the package 101, for example, an edge of the light-transmissive sealing layer 104 may be fixed to an inner edge of the sealing cover 103 by an adhesive. The adhesive may coat the sides of the light-transmissive sealing layer 104 to ensure adhesion reliability to the light-transmissive sealing layer. After the sealing cover plate 103 and the case 101 are fixed, the collimating lens group 105 can be suspended in the air to debug the light collimating effect, after the position of the collimating lens group 105 is debugged and determined, an adhesive is coated on the outer edge of the sealing cover plate 103, and then the collimating lens group 105 and the sealing cover plate 103 are fixed through the adhesive.

Referring to fig. 2 and 13, the side wall 1012 of package 101 may have a plurality of openings on opposite sides thereof, and laser 10 may further include: conductive pins 106, and conductive pins 106 may extend into package 101 through openings in sidewalls 1012, respectively, to be fixed to package 101. The conductive pins 106 may be electrically connected to electrodes of the light emitting chips in the light emitting assembly 102 to transmit an external power to the light emitting chips, so as to excite the light emitting chips to emit light. Alternatively, the aperture of the opening may be 1.2 mm, and the diameter of the conductive pin 106 may be 0.55 mm.

Alternatively, in assembling the laser in the embodiment of the present application, a ring-shaped solder structure (e.g., a ring-shaped glass bead) may be first placed in the opening on the sidewall of the package, and the conductive pin may be inserted through the solder structure and the opening where the solder structure is located. Then, the side wall is placed at the peripheral edge of the bottom plate, annular silver-copper welding flux is placed between the bottom plate and the tube shell, then the structure of the bottom plate, the side wall and the conductive pins is placed into a high-temperature furnace for sealed sintering, and the bottom plate, the side wall, the conductive pins and the welding flux can be integrated after sealed sintering and solidification, so that air tightness of the opening of the side wall is achieved. The light-transmitting sealing layer may be fixed to the sealing cover plate, for example, an edge of the light-transmitting sealing layer is adhered to an inner edge of the sealing cover plate, so as to obtain the upper cover assembly. Then, the light-emitting component can be welded on the bottom plate in the accommodating space of the tube shell, then the upper cover component is welded on the surface of the side wall of the tube shell far away from the bottom plate by adopting a parallel seal welding technology, and finally the collimating lens group is fixed on one side of the upper cover component far away from the bottom plate through epoxy glue, so that the laser device is assembled. It should be noted that the above-mentioned assembling process is only an exemplary process provided in the embodiment of the present application, the welding process adopted in each step may also be replaced by another process, and the sequence of each step may also be adapted to be adjusted, which is not limited in the embodiment of the present application.

To sum up, in the laser provided in the embodiment of the present application, after each light emitting component emits laser to the corresponding collimating lens, the collimating lens can reduce the divergence angle of the laser, so as to collimate the laser. Because laser is greater than the angle of divergence on the slow axis at the angle of divergence of fast epaxial laser, collimating lens in this application embodiment can make the laser of inciding into collimating lens diverge the angle reduction and be less than the angle of divergence reduction on the fast axis on the slow axis after through collimating lens, so laser can reduce the difference of the angle of divergence on fast axis and the slow axis after passing collimating lens in this application, has improved the holistic collimating effect of laser that the laser instrument jetted out.

It should be noted that in the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "at least one" refers to one or more. The term "plurality" means two or more unless expressly limited otherwise. The term "at least one of a and B" in the present application is only one kind of association relationship describing an associated object, and means that three kinds of relationships may exist, for example, at least one of a and B may mean: a exists alone, A and B exist simultaneously, and B exists alone. The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. "substantially", "about", "substantially" and "close" mean within an acceptable error range, within which a person skilled in the art can solve the technical problem and achieve the technical result substantially. In the drawings, the size of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. Like reference numerals refer to like elements throughout.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.