阅读说明：本技术 一种光集成大功率光能量传输组件 (Optical integrated high-power optical energy transmission assembly ) 是由 李艾琳 谢友涵 高楠 谢舒 于 2021-03-02 设计创作，主要内容包括：本发明公开了一种光集成大功率光能量传输组件,其由三部分组成,分别为输入端耦合部件、光纤和输出端耦合部件,所述输入端耦合部件、光纤和输出端耦合部件通过光集成技术集成在一起,成为一个光学件；所述输入端耦合部件从开口端到靠近光纤的一端外径逐渐缩小,其外沿轮廓呈二次函数曲线状。本发明通过光学集成技术,成功地将大功率光纤与输入端和输出端的耦合部件集成为了一体,消除了大功率光纤与两端耦合部件的界面和界限,消除了大功率光纤与两端耦合部件之间界面上的光能量反射与散射,并有效地阻止了高次模向外部有机的强度保护结构中逃逸,大幅度地提高了大功率光能量的传输效率,并且无需使用循环水冷却系统。(The invention discloses an optical integrated high-power optical energy transmission assembly, which consists of three parts, namely an input end coupling part, an optical fiber and an output end coupling part, wherein the input end coupling part, the optical fiber and the output end coupling part are integrated together through an optical integration technology to form an optical part; the outer diameter of the input end coupling part is gradually reduced from the opening end to the end close to the optical fiber, and the outline of the outer edge of the input end coupling part is in a quadratic function curve shape. The invention successfully integrates the high-power optical fiber and the coupling parts of the input end and the output end into a whole through an optical integration technology, eliminates the interface and the boundary between the high-power optical fiber and the coupling parts at the two ends, eliminates the reflection and the scattering of light energy on the interface between the high-power optical fiber and the coupling parts at the two ends, effectively prevents high-order modes from escaping to an external organic intensity protection structure, greatly improves the transmission efficiency of the high-power light energy, and does not need to use a circulating water cooling system.)

1. An optical integrated high-power optical energy transmission assembly is characterized by comprising three parts, namely an input end coupling part, an optical fiber and an output end coupling part, wherein the input end coupling part, the optical fiber and the output end coupling part are integrated together through an optical integration technology to form an optical part;

the outer diameter of the input end coupling part is gradually reduced from the opening end to the end close to the optical fiber, and the outline of the outer edge of the input end coupling part is in a quadratic function curve shape;

the optical fiber adopts a photonic crystal structure component, the optical fiber comprises an optical fiber core, a crystal cladding, an outer cladding and a protective coating, the outer side of the optical fiber core is wrapped by the crystal cladding, the crystal cladding consists of at least one layer of photonic crystal tubules, the photonic crystal tubules are circumferentially arranged on the outer side of the optical fiber core, every two adjacent photonic crystal tubules are tangentially arranged, the number of layers and the aperture of the photonic crystal tubules are set according to product requirements, the outer cladding is wrapped on the outer side of the crystal cladding, the outer cladding is a fluorine-doped quartz glass outer cladding, and the outer side of the outer cladding is coated with the protective coating.

2. An optically integrated high power optical energy transmission assembly according to claim 1, wherein said optical fiber is a high power optical energy transmission fiber.

3. The optically integrated high-power optical energy transmission assembly as claimed in claim 1, wherein the diameter of the coupling surface of the input end coupling component and the light source is 8-12 times of the diameter of the optical fiber, the outer diameter of the input end coupling component gradually changes to the outer diameter of the optical fiber, and the change of the outer diameter is completed according to the quadratic function equation (1) during the integration process;

Y＝ax²+bx+c (1)。

4. an optically integrated high power optical energy transmission module as claimed in claim 1, wherein the input coupling means is integrated with the optical fiber, both of which have the same composition of raw materials, structure, optical properties and optical waveguide.

5. An optically integrated high power optical energy transmission device according to claim 2, wherein said optical fiber is a total reflection type photonic crystal fiber whose optical conduction is totally reflected by means of the interface between the core and the cladding of the crystal.

6. The photonic integrated high power optical energy transmission assembly according to claim 1, wherein there is a clear interface between the optical fiber core and the gas/vacuum inside and outside the surrounding photonic crystal tubes, all the photonic crystal tubes constituting the optical waveguide cladding are filled with gas/vacuum around and inside the photonic crystal tubes, and the gas/vacuum around and inside the photonic crystal tubes and the walls of the photonic crystal tubes constitute an optical waveguide structure, which is an ultra-high purity silica glass core gas/vacuum cladding waveguide structure.

7. An optically integrated high power optical energy transmission module according to claim 1, wherein the theoretical numerical aperture of the input coupling means is up to 0.8.

8. An optically integrated high power optical energy transmission module as claimed in any one of claims 1 to 7, wherein the core wave of the optical fiber is used as the core of the waveguide and is made of ultra-pure silica glass with a refractive index of 1.456.

Technical Field

The invention relates to the technical field of optical fibers, in particular to an optical integrated high-power optical energy transmission assembly.

Background

Optical fibers used for communication are a great invention of the last century, and applications of optical fibers are rapidly developing to other technical fields. The high-power optical fiber is a new technology in the field of optical fibers, and not only can transmit a strong high-power optical signal, but also can transmit strong light energy and strong laser energy. The development of the high-power optical fiber technology promotes the development of the industrial laser processing technology and the development of laser technologies in multiple fields such as military laser technology, laser medical treatment and the like. The high-power optical fiber product manufactured by the optoskand and the high-power optical fiber with the crystal structure manufactured by the Relierre quantum are high-power optical fiber products with excellent conductive performance in the world at present. However, efficient coupling of input and output in practical application systems is still a great technical difficulty.

The current high-power optical fiber products of optoskand almost monopolize the international and Chinese high-power optical fiber markets. However, high power fiber applications capable of delivering kilowatts or more than kilowatts in the optoskand products must be equipped with circulating water cooling devices. The cooling water device not only increases the investment of the equipment and the weight and the volume of the equipment, but also takes away the energy of input light, thereby obviously reducing the transmission efficiency of the high-power optical fiber.

Optoskand high power optical fiber products and other high power optical fiber products in the international market must be equipped with cooling water devices for the following reasons:

1. the numerical aperture is not large enough, and its NA is 0.2. The numerical aperture of the optical fiber determines the bending loss, the numerical aperture is large, the loss caused by the bending of the optical fiber is small, and the bending loss caused by the larger numerical aperture is smaller; conversely, the smaller the numerical aperture, the greater the bending loss caused when the optical fiber is bent. Bending-induced losses must be taken into account due to the insufficient numerical aperture. It is not essential that the bend-induced losses reduce the transmission efficiency, and it is important that the portion of the energy lost by the bend-induced losses escapes entirely from the core of the optical fiber into the protective coating of the optical fiber, where it is absorbed by the coating and converted into heat that accumulates in the coating. The loss caused by bending of the high-power optical fiber transmission system cannot be ignored. The method transmits strong power of thousands of watts or even thousands of watts, even if only one thousandth of bending loss is generated, several watts of energy enter the protective coating of the optical fiber instantly, and several watts of energy are accumulated to reach hundreds of watts, so that the protective coating of the optical fiber and all protective structures and measures are burnt.

Of course, the loss induced by fiber bending is mainly due to higher order modes. High-order mode stripping devices are additionally arranged at input ends of high-power optical fiber products of the optoskand companies and other international companies, and energy of the stripped high-order modes is converted into heat which is taken away by circulating cooling water. The loss caused by bending the fiber after the higher mode is rejected can be ignored.

2. The coupling efficiency between the optical waveguide and the injected light is low. At present, the laser with output power of several kilowatts to ten thousand watts is selected internationally and mainly is a solid laser. The light spot output by the solid laser is about 6mm, and the nominal diameter of high-power optical fiber products such as optoskand is 1 mm. A6 mm light spot is injected into a 1mm optical fiber, which is difficult and low in efficiency. In order to improve the coupling efficiency as much as possible, a quartz glass block which is polished into a cone shape is fused on the top end of the optical fiber, the coupling efficiency of the injected light is obviously improved after the quartz glass block is fused, but the fused connection has a certain interface, the material property and the glass structure of the quartz glass block cannot be completely the same, and the refractive index difference exists. Accordingly, birefringence, reflection and various scattering, sharpness, raman, brillouin, fresnel, etc., occur at the interface where the high power fiber is fused with the quartz glass block. When strong high-power light energy is transmitted, a large amount of heat and rapid accumulation of heat are generated at the fused part by refraction, reflection and all scattering, so that cooling water is required to be arranged at the input and output coupling parts of the high-power optical fiber application system popular in the international market at present to remove the heat generated by refraction, reflection and scattering.

Disclosure of Invention

In view of the above technical shortcomings, the present invention provides an optical integrated high-power optical energy transmission assembly to solve the problems in the prior art.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention provides an optical integrated high-power optical energy transmission assembly, which consists of three parts, namely an input end coupling part, an optical fiber and an output end coupling part, wherein the input end coupling part, the optical fiber and the output end coupling part are integrated together through an optical integration technology to form an optical part;

the optical fiber adopts a photonic crystal structure component, the optical fiber comprises an optical fiber core, a crystal cladding, an outer cladding and a protective coating, the outer side of the optical fiber core is wrapped by the crystal cladding, the crystal cladding consists of at least one layer of photonic crystal tubules, the photonic crystal tubules are circumferentially arranged on the outer side of the optical fiber core, every two adjacent photonic crystal tubules are tangentially arranged, the number and the size of the photonic crystal tubules are set according to product requirements, the outer side of the crystal cladding is wrapped by the outer cladding, the outer cladding is a fluorine-doped quartz glass outer cladding, and the outer side of the outer cladding is coated by the protective coating.

The outer diameter of the input end coupling part is gradually reduced from the opening end to the end close to the optical fiber, and the outline of the outer edge of the input end coupling part is in a quadratic function curve shape, so that the injected light is promoted to be converged into the optical fiber core.

Preferably, the optical fiber is a high power optical energy transmission fiber.

Preferably, the diameter of the coupling surface of the input end coupling component and the light source is 8-12 times of the diameter of the optical fiber, the outer diameter of the input end coupling component gradually changes to the outer diameter of the optical fiber, and the change of the outer diameter is completed according to a quadratic function equation (1) in the integration process.

Y＝ax²+bx+c (1)

Preferably, the input end coupling component is integrated with the optical fiber, the raw material composition, the structure, the optical performance and the optical waveguide of the input end coupling component and the optical fiber are the same, no boundary line exists between the input end coupling component and the optical fiber, no interface exists, no refractive index change exists, and no optical waveguide structural defect exists. The light transmitted from the input end coupling component to the optical fiber path does not generate reflection, refraction and various scattering, and does not generate larger energy loss. Therefore, the high-power light energy of the light integrated high-power light energy transmission assembly does not need to be provided with a circulating water device.

Preferably, in the optical integrated high-power optical energy transmission component, the optical fiber of the invention is a total reflection type photonic crystal fiber. The principle of light transmission is the same as that of the traditional optical fiber, and the light transmission still depends on the total reflection generated by the interface between the optical fiber core and the crystal cladding.

Preferably, the crystal cladding constituting the waveguide is composed of a plurality of photonic crystal tubes, the refractive index of the crystal cladding is determined by the space ratio of the walls of the photonic crystal tubes to the gas/vacuum inside and outside the tubes, the larger the space ratio occupied by the tube walls is, the higher the relative refractive index of the crystal cladding is, and conversely, the larger the space ratio occupied by the gas/vacuum inside and outside the tubes is, the lower the relative refractive index of the crystal cladding is, and the theoretical numerical aperture of the input end and the energy transmission part of the optical integrated high-power optical energy transmission assembly reaches 0.8.

Preferably, the photonic crystal structure has clear interfaces between the fiber core and the gas/vacuum inside and outside the surrounding photonic crystal tubule, and transmitted light is totally reflected back into the fiber core once reaching the interfaces, so that the transmitted light is ensured not to leak. The periphery and the interior of all the photonic crystal small tubes forming the waveguide optical cladding are filled with gas/vacuum, and the gas/vacuum at the periphery and the interior of the photonic crystal small tubes and the tube walls of the photonic crystal small tubes form an optical waveguide structure which is an ultrahigh-purity quartz glass core gas/vacuum cladding waveguide structure.

Preferably, the light penetrates the interface between the fiber core and the crystal cladding and travels a very short distance in the crystal cladding, however, the transmitted light is always transmitted in a gas/vacuum, and at each instant, a large number of light rays travel in the crystal cladding for a short time, and the energy of the large number of short travels is also very considerable. A considerable part of energy of the transmitted light at each moment is transmitted in gas/vacuum, so that the energy density of the transmitted light of the optical fiber core is effectively dispersed, and the saturation density of the transmitted energy is greatly improved.

Preferably, the theoretical numerical aperture of the input end coupling component can reach 0.8, so that the input end coupling component has the lowest bending attenuation and the highest transmission efficiency for the optimal input coupling and the optical waveguide. However, a larger numerical output numerical aperture results in a substantial reduction in spot quality at the output.

Preferably, the optical fiber core wave is used as a waveguide core, the material of the optical fiber core wave is ultra-pure quartz glass, and the refractive index of the optical fiber core wave is 1.456.

The invention has the beneficial effects that:

1. the invention successfully integrates the high-power optical fiber and the coupling parts of the input end and the output end into a whole through an optical integration technology, eliminates the interface and the boundary between the high-power optical fiber and the coupling parts at the two ends, eliminates the reflection and the scattering of light energy on the interface between the high-power optical fiber and the coupling parts at the two ends, effectively prevents high-order modes from escaping to an external organic strength protection structure, greatly improves the transmission efficiency of high-power light energy, and does not need to use a circulating water cooling system which is necessary to be equipped in each high-power optical fiber product application system in the international markets such as optoskand the like.

2. The high-power optical energy transmission part of the invention adopts an optical waveguide TIR-PCF with a photonic crystal structure. The photonic crystal structure optical waveguide does not rely solely on total reflection at the interface between the fiber core and the crystal cladding. Clear interfaces exist between the optical fiber core and gas/vacuum inside and outside the surrounding photonic crystal tubule, and once the transmitted light touches the interfaces, the transmitted light is totally reflected back to the core of the optical fiber, so that the transmitted light is ensured not to leak. The gas/vacuum is filled around and in all the crystal tubules forming the waveguide optical cladding, and the gas/vacuum around and in the tubules and the pipe walls of the crystal tubules also form an optical waveguide structure, which is a waveguide structure of the ultra-pure quartz glass core gas/vacuum cladding in the true sense and is an optical waveguide with low transmission attenuation. Therefore, the higher order modes (cladding modes) injected from the input end can keep transmitting in the optical waveguide composed of the tube wall of the transistor and the surrounding gas/vacuum with ultra-low loss. In the energy transmission system, the energy of the high-order mode in the cladding is also the effective light energy emitted from the light source, and accounts for about 12-20% of the total energy. The transmission of higher-order modes in the crystal cladding does not rely solely on total reflection at the interface between the tubule wall and the surrounding gas/vacuum, but also exploits another property of light: light always selects a substance with higher optical density as a path during propagation. When light strikes the interface between the tubelet wall and the surrounding gas/vacuum, a substantial portion of the light is not immediately reflected at the interface, but instead passes through the interface a short distance into the gas/vacuum cladding before the optically dense material is selected to re-enter the fiber core. The distance that the light travels in the cladding through the interface between the core and the cladding is very short, however, the transmitted light is always transmitted in gas/vacuum, and a lot of light travels in the cladding for a short time at each moment, and the energy for gathering the much short travel is also very considerable. A considerable part of energy of the transmitted light at each moment is transmitted in gas/vacuum, so that the energy density of the transmitted light of the optical fiber core is effectively dispersed, and the saturation density of the transmitted energy is greatly improved.

3. The invention is characterized in that a fluorine-doped quartz glass outer cladding layer barrier is arranged between the wall of the photonic crystal tubule and the organic protective coating. The refractive index of the fluorine-doped quartz glass outer cladding layer is lower than that of the material of the photonic crystal tubule, so that light entering the wall of the photonic crystal tubule cannot escape from the wall of the tubule and enter the organic protective coating, the optical characteristics of the material of the wall of the photonic crystal tubule are completely the same as those of the material of the optical fiber core, a high-order mode cannot leave the wall of the tubule and gather in the core of the waveguide, the high-order mode stably occupies a mode field of the high-order mode, mode conversion and disturbance in the transmission process are inhibited, the interference of nonlinearity and transmission noise is greatly reduced, and the transmission efficiency is greatly improved.

4. The refractive index of the crystal cladding of the invention is determined by the ratio of the wall of the photonic crystal tubule to the space occupied by the gas/vacuum inside and outside the tubule. The space ratio between the wall of the photonic crystal tubule and the occupied space of the internal and external gas/vacuum can be flexibly adjusted in a distance close to the tail end in the integration process. Therefore, the optical integrated high-power optical energy transmission assembly has the highest input coupling efficiency and an extremely high-quality output light spot.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an optical integrated high-power optical energy transmission assembly according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an input-side coupling unit according to the present invention;

FIG. 3 is a cross-sectional view of an optical fiber according to the present invention;

fig. 4 is a schematic diagram of total reflection transmission of an optical fiber.

Fig. 5 is a schematic view of light penetrating the interface between the fiber core and the crystal cladding.

Fig. 6 is a graph of the proportion of the duty cycle of the wall of a photonic crystal tubule as a function of the proximal end distance during integration.

Description of reference numerals:

1-input end coupling component, 2-optical fiber, 3-output end coupling component, 21-optical fiber core, 22-crystal cladding, 23-outer cladding and 24-protective coating.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Example (b):

as shown in fig. 1-3, the present invention provides an optical integrated high-power optical energy transmission assembly, which is composed of three parts, i.e. an input end coupling component 1, an optical fiber 2 and an output end coupling component 3, wherein the input end coupling component 1, the optical fiber 2 and the output end coupling component 3 are integrated together by optical integration technology to form an optical component.

The optical fiber 2 is a high-power optical energy transmission fiber.

The outer diameter of the input end coupling part 1 is gradually reduced from the opening end to the end close to the optical fiber, and the outline of the outer edge is in a quadratic function curve shape, so that the injected light is promoted to be converged into the optical fiber core. Not a simple cone.

The diameter of the coupling surface of the input end coupling part 1 and the light source is 8-12 times of the diameter of the optical fiber 2, the input end coupling part 1 and the optical fiber 2 are integrated into a whole, the large outer diameter of the input end coupling part 2 is gradually changed to the set outer diameter of the optical fiber 2, and in the integration process, the outer diameter change is completed according to a quadratic function equation (1).

Y＝ax²+bx+c (1)

The input end coupling component 1 is integrated with the optical fiber 2, the raw material composition, the structure, the optical performance and the optical waveguide of the input end coupling component and the optical fiber are completely the same, no boundary line exists between the input end coupling component and the optical fiber, no interface exists, no refractive index change exists, and no structural defect of the optical waveguide exists. The light transmitted from the input end coupling component 1 to the optical fiber 2 does not generate reflection, refraction and various scattering, and does not generate large energy loss. Therefore, the high-power optical energy (including powerful laser energy) of the optical integrated high-power optical energy transmission assembly does not need to be equipped with a water circulating device.

In the optical integrated high-power optical energy transmission assembly, the optical fiber 2 adopts an optical crystal structure assembly, as shown in fig. 3. The optical fiber 2 comprises an optical fiber core 21, a crystal cladding 22, an outer cladding 23 and a protective coating 24, the crystal cladding 22 wraps the outer side of the optical fiber core 21, the crystal cladding 22 consists of at least one layer of photonic crystal tubules, the photonic crystal tubules are circumferentially arranged on the outer side of the optical fiber core 21, every two adjacent photonic crystal tubules are tangentially arranged, the number of layers and the aperture of the photonic crystal tubules are set according to product requirements, the outer cladding 23 wraps the outer side of the crystal cladding 22, the outer cladding 23 is a fluorine-doped quartz glass outer cladding, and the outer side of the outer cladding 23 is coated with the protective coating 24.

The optical fiber 2 of the present invention is a total reflection type photonic crystal fiber. The principle of light transmission is the same as that of the conventional optical fiber, and the light transmission still depends on the interface between the optical fiber core and the crystal cladding to generate total reflection, as shown in fig. 4.

The crystal cladding 22 forming the waveguide is composed of a plurality of photonic crystal tubes, the numerical value of the refractive index of the crystal cladding 22 is determined by the space ratio of the walls of the photonic crystal tubes to the gas/vacuum inside and outside the tubes, the larger the space ratio occupied by the tube walls is, the higher the relative refractive index of the crystal cladding 22 is, on the contrary, the larger the space ratio occupied by the gas/vacuum inside and outside the tubes is, the lower the relative refractive index of the crystal cladding 22 is, and the theoretical numerical aperture of the input end and the energy transmission part of the optical integrated high-power optical energy transmission assembly reaches 0.8.

The photonic crystal structure, as shown in fig. 5, has clear interfaces between the optical fiber core 21 and the gas/vacuum inside and outside the surrounding photonic crystal tubule, and once the transmitted light touches the interfaces, the transmitted light is totally reflected back into the optical fiber core 21, thereby ensuring that the transmitted light does not leak. The periphery and the interior of all the photonic crystal small tubes forming the waveguide optical cladding are filled with gas/vacuum, the gas/vacuum around and in the photonic crystal small tubes and the tube walls of the photonic crystal small tubes form an optical waveguide structure which is a waveguide structure of the ultra-pure quartz glass core gas/vacuum cladding in the true sense, so that a high-order mode (cladding mode) injected from an input end can be kept in the optical waveguide formed by the tube walls of the photonic crystal small tubes and the surrounding gas/vacuum for ultra-low loss transmission. The intermixing of higher order modes in a communication system can substantially reduce the transmission rate of the communication system in the transmitted optical signal. In the energy transfer system, the energy of the higher-order modes in the crystal cladding 22 is also the effective light energy emitted from the light source, accounting for 12-20% of the total energy. The transmission of higher order modes in the crystal cladding 22 does not rely solely on total reflection at the interface between the wall of the photonic crystal tubule and the surrounding gas/vacuum. However, the optically integrated high power optical energy transmission assembly also takes advantage of another property of light: light always selects a substance with higher optical density as a path during propagation. When the light hits the interface between the tubelet wall and the surrounding gas/vacuum, a significant portion of the light is not immediately reflected at the interface, but instead re-enters the fiber core 21 after traveling a short distance through the interface in the gas/vacuum cladding.

The light penetrates the interface between the fiber core 21 and the crystal cladding 22 and travels a very short distance in the crystal cladding 22, however, the transmitted light is always transmitted in a gas/vacuum, and at each instant, a lot of light travels in the crystal cladding 22 for a short time, and the energy of the many short travels is also very considerable. At each moment, a considerable part of energy of the transmitted light is transmitted in gas/vacuum, so that the energy density of the transmitted light of the optical fiber core 21 is effectively dispersed, and the saturation density of the transmitted energy is greatly improved.

A fluorine-doped quartz glass outer cladding layer is arranged between the crystal cladding layer 22 and the protective coating layer 24 for blocking. The refractive index of the fluorine-doped quartz glass outer cladding layer is lower than that of the photonic crystal tubule, so light entering the wall of the photonic crystal tubule cannot enter the organic protective coating 24, the optical characteristics of the material of the wall of the photonic crystal tubule are the same as that of the material of the optical fiber core 21, a high-order mode cannot leave the wall of the photonic crystal tubule and gather towards the core of the waveguide, the high-order mode stably occupies a mode field, mode conversion and disturbance in the transmission process are inhibited, the interference of nonlinearity and noise is greatly reduced, the saturation power density of light energy transmitted by the light integrated high-power light energy transmission assembly is more than 20% higher than that of optoskand other products which transmit high-power light energy currently and internationally popular. Input end coupling part 1, optical fiber 2 and output end coupling part 3

The numerical aperture of the coupling component 3 at the output end of the optical integrated high-power optical energy transmission assembly can select the optimal numerical value according to the technical requirements of an application system. The theoretical numerical aperture of the input end coupling part 1 can reach 0.8, and the input end coupling part is used for achieving the best input coupling, the lowest bending attenuation of the optical waveguide and the highest transmission efficiency. However, a larger numerical output numerical aperture results in a substantial reduction in spot quality at the output.

The numerical aperture of the waveguide is determined by the refractive index difference between the waveguide core and the cladding,

the waveguide core is an optical fiber core, and the material of the waveguide core is ultra-pure quartz glass with the refractive index of 1.456; the refractive index of the crystal cladding 22 is determined by the ratio of the wall of the photonic crystal tubule to the space occupied by the gas/vacuum inside and outside the tubule.

The ratio of the space occupied by the walls of the photonic crystal tubules and the internal and external gas/vacuum can be adjusted during integration within a distance close to the output coupling component 3. As shown in fig. 6, the proportion of the occupied space of the wall of the photonic crystal tubule in the integration process is larger as the distance from the end of the output end coupling part 3 is larger. The input and output of an optical integrated assembly can be selected to have numerical apertures of widely different values. The optical fiber laser has the highest input coupling efficiency and extremely high-quality output light spots, and is an international innovation achievement of the modern powerful power optical energy transmission technology.

Fifth, embodiment:

1. the invention integrates the input end coupling part 1, the high-power optical fiber 2 and the output end coupling part 3 of the high-power optical energy transmission into a high-power optical energy transmission assembly by adopting an optical integration technology, eliminates the refraction, birefringence, reflection and various scattering generated by the transmission light on the connection or fusion interface of the input end and the output end coupling devices of the high-power optical fiber and the high-power optical fiber, and greatly reduces the energy loss of the transmission light.

2. The high-power optical energy transmission part adopts an optical waveguide TIR-PCF with a photonic crystal structure. The photonic crystal structure optical waveguide does not rely solely on total reflection at the interface between the fiber core and the crystal cladding. Clear interfaces exist between the optical fiber core and gas/vacuum inside and outside the surrounding photonic crystal tubule, and once the transmitted light touches the interfaces, the transmitted light is totally reflected back to the core of the optical fiber, so that the transmitted light is ensured not to leak. The gas/vacuum is filled around and in all the crystal tubules forming the waveguide optical cladding, and the gas/vacuum around and in the tubules and the pipe walls of the crystal tubules also form an optical waveguide structure, which is a waveguide structure of the ultra-pure quartz glass core gas/vacuum cladding in the true sense and is an optical waveguide with low transmission attenuation. Therefore, the higher order modes (cladding modes) injected from the input end can keep transmitting in the optical waveguide composed of the tube wall of the transistor and the surrounding gas/vacuum with ultra-low loss. In the energy transmission system, the energy of the high-order mode in the cladding is also the effective light energy emitted from the light source, and accounts for about 12-20% of the total energy. The transmission of higher-order modes in the crystal cladding does not rely solely on total reflection at the interface between the tubule wall and the surrounding gas/vacuum, but also exploits another property of light: light always selects a substance with higher optical density as a path during propagation. When the light hits the interface between the tubelet wall and the surrounding gas/vacuum, a significant portion of the light is not immediately reflected at the interface, but instead re-enters the fiber core after traveling a short distance through the interface in the gas/vacuum cladding. The distance that the light travels in the cladding through the interface between the core and the cladding is very short, however, the transmitted light is always transmitted in gas/vacuum, and a lot of light travels in the cladding for a short time at each moment, and the energy for gathering the much short travel is also very considerable. A considerable part of energy of the transmitted light at each moment is transmitted in gas/vacuum, so that the energy density of the transmitted light of the optical fiber core is effectively dispersed, and the saturation density of the transmitted energy is greatly improved.

A quartz glass outer cladding layer doped with fluorine is arranged between the tube wall of the small crystal tube and the organic coating layer for blocking. The refractive index of the fluorine-doped quartz glass outer cladding layer is lower than that of the material of the crystal tubule, so that light entering the pipe wall of the crystal tubule cannot escape from the pipe wall of the tubule to enter the organic protective coating, the optical characteristics of the material of the pipe wall of the tubule are completely the same as that of the material of the optical fiber core, a high-order mode cannot leave the pipe wall of the tubule and gather in the core of the waveguide, the high-order mode stably occupies the mode field of the high-order mode, mode conversion and disturbance in the transmission process are inhibited, the interference of nonlinearity and transmission noise is greatly reduced, and the transmission efficiency is.

3. The refractive index of the crystal cladding is determined by the ratio of the wall of the photonic crystal tubule to the space occupied by the gas/vacuum inside and outside the tubule. The space ratio between the wall of the photonic crystal tubule and the occupied space of the internal and external gas/vacuum can be flexibly adjusted in a distance close to the tail end in the integration process. Therefore, the optical integrated high-power optical energy transmission assembly has the highest input coupling efficiency and an extremely high-quality output light spot.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.