阅读说明：本技术 一种偏振合束器及激光器 (Polarization beam combiner and laser ) 是由 周少丰 刘鹏 黄良杰 于 2020-08-03 设计创作，主要内容包括：本发明实施例涉及光学器件设计技术领域,公开了一种偏振合束器及激光器,该偏振合束器包括：用于接收第一光束的第一入光面、用于接收第二光束的第二入光面和用于输出合束激光的出光面,第二入光面与第一入光面相交且非垂直设置,出光面与第一入光面存在一定的角度,该角度不为九十度,且出光面镀设有用于反射回返光的反射膜,本发明实施例提供的偏振合束器,一方面,能够不让回返光重新返回到激光芯片中,烧毁芯片,另一方面,能够不将回返光重新反射回光纤谐振腔中,有效滤除回返光,应用于激光器中时激光器的出光效果更好。(The embodiment of the invention relates to the technical field of optical device design, and discloses a polarization beam combiner and a laser, wherein the polarization beam combiner comprises: the polarization beam combiner provided by the embodiment of the invention has the advantages that on one hand, the returned light can not be returned to the laser chip again to burn the chip, on the other hand, the returned light can not be reflected back to the optical fiber resonant cavity again, the returned light is effectively filtered, and the light emitting effect of the laser is better when the polarization beam combiner is applied to the laser.)

1. A polarization beam combiner, comprising:

the first light incident surface is used for receiving the first light beam;

the second light incident surface is intersected with the first light incident surface and is not vertically arranged, and is used for receiving a second light beam;

and the light emitting surface is used for outputting the combined laser after the first light beam and the second light beam are combined, a certain angle exists between the light emitting surface and the first light incident surface, the angle is not ninety degrees, and the light emitting surface is plated with a reflecting film and used for reflecting the returned light.

2. The polarization beam combiner of claim 1, wherein the first light beam and the second light beam are P-rays, the first light incident surface is configured to attach a half-wave plate, the half-wave plate is configured to rotate the polarization direction of the first light beam by 90 °, and the polarization beam combiner further comprises:

and the beam combination surface is plated with a film layer which is used for transmitting the P light and reflecting the S light and is used for transmitting the second light beam and reflecting the first light beam after the polarization direction of the first light beam is changed by the half-wave plate.

3. A polarization beam combiner according to claim 2,

the first light beam is not coincident with a normal of the first light incident surface, and the second light beam is not coincident with a normal of the second light incident surface.

4. A polarization beam combiner according to claim 3,

the included angle of intersection of the beam combining surface and the first light incident surface on the extension line satisfies the following formula:

wherein θ represents an included angle between the beam combining plane and the first light incident plane after intersection on the extension line, α₁Representing an angle, alpha, between the first light beam and a normal to the first light entry surface₂And an included angle between the second light beam and a normal of the second light incident surface is represented, and n represents the refractive index of the polarization beam combiner.

5. A polarization beam combiner according to claim 4,

the first light incident surface, the second light incident surface and the light emergent surface are all plated with antireflection films.

6. A polarization beam combiner according to claim 5,

the second light incident surface and the light emergent surface are arranged in parallel, and the cross section of the polarization beam combiner in the light emergent direction is in a diamond shape.

7. A laser, comprising:

the first laser module is used for outputting a first light beam;

the second laser module is used for outputting a second light beam;

the polarization beam combiner of any one of claims 1 to 6, wherein a first light incident surface is configured to receive the first light beam, a second light incident surface is configured to receive the second light beam, and a light emitting surface is configured to output a combined laser beam;

the focusing lens is used for receiving the combined laser and focusing the combined laser;

and the optical fiber end is used for receiving the focused combined laser.

8. The laser of claim 7, further comprising:

the half-wave plate is attached to the first light incident surface of the polarization beam combiner and used for changing the polarization state of the first light beam.

9. The laser of claim 8, further comprising:

and the first reflector is arranged between the first laser module and the half-wave plate and used for changing the direction of the first light beam so as to enable the first light beam to be incident to the first light incident surface of the polarization beam combiner.

10. The laser of claim 9,

first laser module with the second laser module includes at least a set of laser module respectively, the laser module includes:

the COS element comprises a laser chip and a control chip, wherein the laser chip is used for emitting laser with preset wavelength;

the fast axis collimating lens is arranged in the light emergent direction of the COS element;

the slow axis collimating lens is arranged in the light emergent direction of the fast axis collimating lens;

and the second reflector is arranged in the light emergent direction of the slow-axis collimating lens and used for adjusting the light emergent direction of the first light beam or the second light beam.

Technical Field

The embodiment of the invention relates to the technical field of optical device design, in particular to a polarization beam combiner and a laser.

Background

The beam combiner is a device capable of combining two beams of light with different directions or states into one beam of light and emitting the light, and when the beam combiner is applied to a laser, the beam combiner can combine two groups of light beams emitted in different directions into one beam of light and emit the light beam, and meanwhile, when the beam combiner is a polarization beam combiner, the beam combiner can also be used for combining two beams of polarized light with orthogonal polarization states, and the polarization beam splitter can also reversely divide incident unpolarized light into two beams of polarized light with orthogonal polarization states.

In implementing the embodiments of the present invention, the inventors found that at least the following problems exist in the above related art: at present, in a polarization beam combiner applied to a laser, in order to prevent return light from reentering a laser module and damaging a laser chip, a common method is to plate a reflective film on a surface, which causes the reflective film to reenter the return light into an optical fiber resonant cavity, and causes unwanted light to reenter the optical fiber resonant cavity, thereby affecting a light emitting effect.

Disclosure of Invention

In view of the foregoing defects in the prior art, an embodiment of the present invention provides a polarization beam combiner and a laser capable of filtering returned light.

The purpose of the embodiment of the invention is realized by the following technical scheme:

to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a polarization beam combiner, including:

the first light incident surface is used for receiving the first light beam;

the second light incident surface is intersected with the first light incident surface and is not vertically arranged, and is used for receiving a second light beam;

and the light emitting surface is used for outputting the combined laser after the first light beam and the second light beam are combined, a certain angle exists between the light emitting surface and the first light incident surface, the angle is not ninety degrees, and the light emitting surface is plated with a reflecting film and used for reflecting the returned light.

In some embodiments, the first light beam and the second light beam are P light, the first light incident surface is configured to attach a half-wave plate, the half-wave plate is configured to rotate the polarization direction of the first light beam by 90 °, and the polarization beam combiner further includes:

and the beam combination surface is plated with a film layer which is used for transmitting the P light and reflecting the S light and is used for transmitting the second light beam and reflecting the first light beam after the polarization direction of the first light beam is changed by the half-wave plate.

In some embodiments, the first light beam is not coincident with a normal to the first light entry surface, and the second light beam is not coincident with a normal to the second light entry surface.

In some embodiments, an included angle at which the beam combining plane and the first light incident plane intersect on the extension line satisfies the following formula:

wherein θ represents an included angle between the beam combining plane and the first light incident plane after intersection on the extension line, α₁Representing an angle, alpha, between the first light beam and a normal to the first light entry surface₂And an included angle between the second light beam and a normal of the second light incident surface is represented, and n represents the refractive index of the polarization beam combiner.

In some embodiments, the first light incident surface, the second light incident surface, and the light emitting surface are all plated with antireflection films.

In some embodiments, the second light incident surface is parallel to the light emitting surface, and a cross section of the polarization beam combiner in the light emitting direction is in a diamond shape.

In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides a laser, including:

the first laser module is used for outputting a first light beam;

the second laser module is used for outputting a second light beam;

in the polarization beam combiner according to the first aspect, a first light incident surface of the polarization beam combiner is configured to receive the first light beam, a second light incident surface of the polarization beam combiner is configured to receive the second light beam, and a light emergent surface of the polarization beam combiner is configured to output a combined laser beam;

the focusing lens is used for receiving the combined laser and focusing the combined laser;

and the optical fiber end is used for receiving the focused combined laser.

In some embodiments, the laser further comprises:

the half-wave plate is attached to the first light incident surface of the polarization beam combiner and used for changing the polarization state of the first light beam.

In some embodiments, the laser further comprises:

and the first reflector is arranged between the first laser module and the half-wave plate and used for changing the direction of the first light beam so as to enable the first light beam to be incident to the first light incident surface of the polarization beam combiner.

In some embodiments, the first and second laser modules each include at least one set of laser modules, the laser modules including:

the COS element comprises a laser chip and a control chip, wherein the laser chip is used for emitting laser with preset wavelength;

the fast axis collimating lens is arranged in the light emergent direction of the COS element;

the slow axis collimating lens is arranged in the light emergent direction of the fast axis collimating lens;

and the second reflector is arranged in the light emergent direction of the slow-axis collimating lens and used for adjusting the light emergent direction of the first light beam or the second light beam.

Compared with the prior art, the invention has the beneficial effects that: in contrast to the prior art, an embodiment of the present invention provides a polarization beam combiner and a laser, where the polarization beam combiner includes: the polarization beam combiner provided by the embodiment of the invention has the advantages that on one hand, the returned light can not be returned to the laser chip again to burn the chip, on the other hand, the returned light can not be reflected back to the optical fiber resonant cavity again, the returned light is effectively filtered, and the light emitting effect of the laser is better when the polarization beam combiner is applied to the laser.

Drawings

The embodiments are illustrated by the figures of the accompanying drawings which correspond and are not meant to limit the embodiments, in which elements/blocks having the same reference number designation may be represented by like elements/blocks, and in which the drawings are not to scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of a polarization beam combiner according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a calculation of an angle between a beam combining plane of the polarization beam combiner and a first light incident plane intersecting on an extension line;

fig. 3 is a schematic structural diagram of a laser according to a second embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. In order to facilitate the definition of the connection structure, the position of the component is defined by taking the light emergent direction as a reference.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Specifically, the embodiments of the present invention will be further explained below with reference to the drawings.