阅读说明：本技术 一种太阳能泵浦和驱动的激光器系统 (Solar pump and driven laser system ) 是由 王旭 于 2020-05-26 设计创作，主要内容包括：本申请公开了一种太阳能泵浦和驱动的激光器系统,所述激光器系统包括光学镜组与太阳能电池复用系统,激光器阵列系统；所述光学镜组与太阳能电池复用系统由多块具有复用功能的拼接部拼接而成,可拼接成汇聚透镜阵列,或反射镜阵列,或拼接成太阳能电池板阵列；所述激光器阵列系统的结构包括增益介质阵列,透明基板,增益介质阵列分布于透明基板上。本发明使用太阳能电池替代了很多现有方案中用反射镜将太阳光反射汇聚二次经过增益介质的方法,将太阳光中无法被增益介质吸收的波段的光能量转换成电能,大幅提高了太阳光利用率。同时利用多激光谐振腔阵列合束方式提高输出激光的功率。(The application discloses a solar pump and driven laser system, which comprises an optical lens group, a solar cell multiplexing system and a laser array system; the optical lens group and the solar cell multiplexing system are formed by splicing a plurality of splicing parts with multiplexing functions and can be spliced into a converging lens array, or a reflector array, or spliced into a solar cell panel array; the structure of the laser array system comprises a gain medium array and a transparent substrate, wherein the gain medium array is distributed on the transparent substrate. The invention uses the solar cell to replace a plurality of methods of reflecting and converging sunlight by using a reflector to pass through the gain medium for the second time in the prior scheme, converts light energy of wave bands which cannot be absorbed by the gain medium in the sunlight into electric energy, and greatly improves the utilization rate of the sunlight. Meanwhile, the power of output laser is improved by utilizing a multi-laser resonant cavity array beam combination mode.)

1. A solar energy pump and driven laser system is characterized in that the laser system comprises an optical lens group, a solar cell multiplexing system and a laser array system; the optical lens group and the solar cell multiplexing system are formed by splicing a plurality of splicing parts with multiplexing functions and can be spliced into a converging lens array, or a reflector array, or spliced into a solar cell panel array; the structure of the laser array system comprises a gain medium array and a transparent substrate, wherein the gain medium array is distributed on the transparent substrate, and the gain medium array and a grating, a coating film or a reflector at the end part of the gain medium array form a laser resonant cavity array.

2. A solar pumped and driven laser system according to claim 1, wherein: the gain medium array adopts a structure beneficial to reducing the laser threshold value, and comprises but is not limited to a thin film waveguide structure, a lath structure, a rod structure, a microchip structure and an optical fiber structure.

3. A solar pumped and driven laser system according to claim 2, wherein: the two end faces of each gain medium in the gain medium array are parallel planes or curved surface structures with the normal direction being the same as the light passing direction;

or two end faces of each gain medium in the gain medium array form a certain angle to form a Brewster window structure;

or, the output end of each gain medium in the gain medium array is of a throat structure, and the shape and size of the tail end of each throat are compatible with the size of the optical fiber;

or, a plurality of gain media in the gain medium array are connected in series to form a laser resonant cavity.

4. A solar pumped and driven laser system according to claim 1, wherein: the transparent substrate is in a shape of a flat plate, a bent plate, a solid cylinder, a solid elliptic cylinder, a cubic column or a parallelogram column, a prism, a solid truncated cone, a hollow or solid polygonal truncated cone, or a combination or an array of a plurality of same or different shapes.

5. A solar pumped and driven laser system according to claim 1, wherein: the transparent substrate is made of a material with a wide spectrum transmission range, a high heat conductivity coefficient and a small thermal expansion coefficient, and the number of the transparent substrates is one or more than one.

6. A solar pumped and driven laser system according to claim 4 or 5, wherein: the laser resonant cavity arrays are distributed on the upper surface and the lower surface or the inner surface and the outer surface of the transparent substrate in a staggered mode in a fence mode, and different three-dimensional array structures are formed according to different shapes and array modes of the transparent substrate.

7. A solar pumped and driven laser system according to claim 1, wherein: the splicing part comprises an optical lens group surface and an opposite surface, a solar cell integrated plate surface and an opposite surface and two end surfaces, wherein the two end surfaces are respectively connected with the two telescopic supporting rods through rotating shafts; the optical lens group surface and the opposite surface form a converging lens to converge sunlight to the gain medium array, and the two adjacent opposite surfaces are double-sided solar cell integrated plate surfaces, or one surface is a solar cell integrated plate surface and the other surface is a sunlight reflector.

8. A solar pumped and driven laser system according to claim 7, wherein: the telescopic supporting rod is arranged on the annular track and can move along the track.

9. A solar pumped and driven laser system according to claim 1, wherein: the transparent substrate is in a hollow column shape, and all laser resonant cavity arrays on the transparent substrate share one set of total reflection mirror, half reflection mirror and focusing mirror.

10. A solar pumped and driven laser system according to claim 9, wherein: the total reflection mirror, the semi-reflection mirror and the focusing mirror are annular lenses with hollow middle parts.

11. A solar pumped and driven laser system according to claim 1, wherein: the transparent substrate is a hollow round table or a plurality of hollow round tables which are coaxially connected in series and have different convergence angles, and the light convergence focuses of the laser resonant cavity arrays on the round tables are superposed to realize the self-focusing function.

12. A solar pumped and driven laser system according to any of claims 9-11, wherein: the laser output by the laser resonant cavity array is used as a pumping light source with the same pump and then injected into another gain medium to obtain higher-quality laser output.

Technical Field

The invention relates to the technical field of lasers, and particularly provides a solar pump and a driven laser system.

Background

The solid laser is the laser with the widest application range and the most mature technology at present, and the principle is that laser power amplification under the pumping condition is realized based on stimulated radiation light amplification of light. The basic structure is that a pumping source is used for exciting a gain medium in a laser resonant cavity, and generated excited radiation light is continuously amplified by the resonant cavity and finally output as laser. The conventional laser pumping source generally converts electric energy into light energy with a specific wavelength, and then uses the light energy to excite and generate laser. The sunlight has an extremely wide spectrum range and comprises a spectrum which can be used as a laser pumping light source, so the sunlight can be directly used as the pumping light source of the laser, multiple energy conversion is not needed, the application range of the laser technology is convenient to realize and expand, and the sunlight has objective prospect and economic value.

Environmental issues and energy crisis issues have become apparent and research into how to utilize clean renewable resources such as solar energy has become increasingly important. The traditional solar energy collection method mainly comprises the technologies of photo-thermal conversion, photoelectric conversion, solar energy-hydrogen energy conversion and the like. Among them, the solar cell technology is a mature technology with a relatively high energy utilization rate.

The general idea of the existing technology for generating laser by solar energy pumping is as follows: the sunlight is converged by the lens to improve the energy density, and the converged light spots are injected from the side surface or the end surface of the gain medium to be used as a pumping light source. In order to collect more solar energy, the size of the focusing lens is very large, and the large-size lens made of conventional materials is difficult to process, high in cost and easy to damage, so that a Fresnel lens is frequently adopted. The focused light spot of the sunlight injection point on the laser gain medium is generally the focus of the convergent lens, the converged light spot is in a superfine circle shape, the power density of the focused point is high, heat is easy to accumulate when the laser gain medium works for a long time, and various heat effects which are unfavorable for the gain medium are generated. In addition, in order to improve the utilization rate of sunlight, a set of reflection converging lens is designed on the back surface of the gain medium, the sunlight is reflected and converged and then passes through the gain medium again, but the lens is generally an elliptical or parabolic mirror, the processing difficulty is high, the waveband of the sunlight which can be used as pump light after passing through the gain medium once is absorbed, and even if the emergent sunlight is reflected back to the gain medium, the rest sunlight waveband components have almost no utilization value for the gain medium. Therefore, the laser light generated by solar light excitation actually uses only a very small part of the spectral energy in the solar light spectrum, and the light energy utilization rate is still low.

Disclosure of Invention

The technical task of the present invention is to provide a solar pump and a driven laser system for solving the above problems

In order to achieve the purpose, the invention provides the following technical scheme:

a solar energy pump and driven laser system, the said laser system includes the optical lens group and solar cell multiplexing system, laser array system; the optical lens group and the solar cell multiplexing system are formed by splicing a plurality of splicing parts with multiplexing functions and can be spliced into a converging lens array or a reflector array or spliced into a solar cell panel array; the structure of the laser array system comprises a gain medium array and a transparent substrate, wherein the gain medium array is distributed on the transparent substrate, and the gain medium array and a grating, a coating film or a reflector at the end part of the gain medium array form a laser resonant cavity array. The laser resonant cavity can be formed by arranging corresponding total reflection mirrors and half reflection mirrors at two ends of each gain medium, or formed by respectively plating total reflection films and half reflection films at two ends of each gain medium, or formed by respectively photoetching gratings with different reflectivities at two ends of each gain medium.

The lens spliced by the plurality of converging lens groups converges sunlight onto a gain medium array of the laser array system, and the gain medium absorbs a specific spectrum in the sunlight and generates laser; after the absorption of the multilayer gain medium array, the residual unabsorbed sunlight penetrates through the laser array system, irradiates on a solar cell panel array formed by splicing a plurality of solar cells, is converted into electric energy to be stored, and provides energy for a sunlight positioning and tracking system, a control and power system and an additional laser pump in the laser array system.

The gain medium array adopts a structure beneficial to reducing the laser threshold value, and comprises but is not limited to a thin film waveguide structure, a lath structure, a rod structure, a microchip structure and an optical fiber structure. The length of the pumping light receiving surface of the gain medium is larger than the thickness of the gain medium, so that the diffraction phenomenon of laser in internal reflection is eliminated.

The two end faces of each gain medium in the gain medium array are parallel planes or curved surface structures with the normal direction being the same as the light passing direction;

or two end faces of each gain medium in the gain medium array form a certain angle to form a Brewster window structure;

or, one end face of each gain medium in the gain medium array is in a reduced structure, and the shape and the size of the end of the reduced structure are compatible with the size of the optical fiber.

Or, a plurality of gain media in the gain medium array are connected in series to form a laser resonant cavity, such as: the gain medium is directly connected in series by arranging a Paul prism, arranging two 45-degree reflectors, using optical fiber for conduction or aligning gain media at corresponding positions of different transparent substrates.

The transparent substrate is in a shape of a flat plate, a bent plate, a solid cylinder, a solid elliptic cylinder, a cubic column or a parallelogram column, a prism, a solid truncated cone, a hollow or solid polygonal truncated cone, or a combination or an array of a plurality of same or different shapes.

The transparent substrate is made of materials with wide spectrum transmission range, high heat conductivity coefficient and small thermal expansion coefficient, including but not limited to optical-grade quartz glass, lithium niobate crystal, YAG, sapphire and the like, and the number of the transparent substrates is one or more than one array arrangement.

The laser resonant cavity arrays are distributed on the upper surface and the lower surface or the inner surface and the outer surface of the transparent substrate in a staggered mode in a fence mode, and different three-dimensional array structures are formed according to different shapes and array modes of the transparent substrate, so that the sunlight irradiation area is increased, and meanwhile, the negative influence of the heat effect on the laser when the volume of the gain medium is larger is reduced.

The splicing part comprises an optical lens group surface and an opposite surface, a solar cell integrated plate surface and an opposite surface and two end surfaces, wherein the two end surfaces are respectively connected with the two telescopic supporting rods through rotating shafts, so that the splicing part can rotate around a shaft; the optical lens group surface and the opposite surface form a converging lens to converge sunlight to the gain medium array, and the two adjacent opposite surfaces are double-sided solar cell integrated plate surfaces or one solar cell integrated plate surface and the other solar reflector.

The optical lens group surface and the opposite surface of each splicing part are strip-shaped lenses spliced by a plurality of converging lenses, sunlight is converged into strip-shaped light spots, the strip-shaped light spots irradiate on the gain medium array of the laser array system, and the shape and the size of the light spots can cover all the gain medium arrays.

The telescopic supporting rods are mounted on the annular rail and can move along the annular rail, and the plurality of splicing parts are spliced into a circular mirror, an elliptic mirror, a paraboloidal mirror or other required shapes by adjusting the length of the telescopic supporting rods and matching with the annular rail.

The transparent substrate is in a hollow column shape, and all laser resonant cavity arrays on the transparent substrate share one set of total reflection mirror, half reflection mirror and focusing mirror.

The total reflection mirror, the semi-reflection mirror and the focusing mirror are annular lenses with hollow middle parts.

The transparent substrate is a hollow round table or a plurality of hollow round tables which are coaxially connected in series and have different convergence angles, and the light convergence focuses of the laser resonant cavity arrays on the round tables are superposed to realize the self-focusing function.

The laser output by the laser resonant cavity array can also be used as a pumping light source with the same pump and then injected into another gain medium to obtain higher-quality laser output.

The laser system also comprises a sunlight positioning and tracking system, a control and power system, a laser beam combining unit and an additional laser pump.

The solar cell panel array can provide power for additional laser pumping and provide additional pumping light for the laser resonant cavity array, so that the laser output power is further improved.

Compared with the prior art, the solar pump and the driven laser system have the following outstanding beneficial effects:

the invention uses the structure of the miniature laser resonant cavity, has reduced the laser threshold, make it still can produce the laser while pumping the solar energy lower, the gain medium array structure is favorable to dispelling the heat, can reduce the influence on laser of various thermal effects well, facilitate obtaining the laser output of the greater energy at the same time; the use of solar cells replaces many of the prior art approaches of re-reflectively focusing solar energy back into the gain medium with a mirror, because the spectrum contributing to lasing is already absorbed out of the sunlight transmitted through the laser gain medium, and even the re-reflection back-off effect is not significant. According to the analysis of fig. 17 and 18, the light wave bands which can be absorbed by the gain medium and used for generating laser in the sunlight are only a few absorption peaks in the ranges of 350 nm-400 nm, 500 nm-600 nm and 700 nm-900 nm, most of the sunlight energy can not be effectively utilized, the solar cell is used for replacing a reflector in the scheme, the absorption range of the solar cell on the solar spectrum is very wide, the spectrum range which does not contribute to generating the laser in the sunlight can be utilized and converted into electric energy, and the sunlight utilization rate is really and greatly improved. The generated electric energy can be supplied to the whole system for operation, redundant electric energy can drive the additional laser pump to provide extra pump light for the laser resonant cavity array, and therefore laser output power is further improved. The system can independently operate in an outer space environment, does not need to get electricity from an artificial satellite or a space station, is compatible with a ground use environment, has a technical prospect of obtaining high-power laser, and has a wide application prospect in the fields of space laser communication, laser radars, atmosphere and earth surface structure detection, laser navigation, laser weapons, laser remote power transmission and the like.

Drawings

FIG. 1 is a schematic diagram of a laser system architecture for solar optical pumping and driving of the present invention;

FIG. 2 is a schematic view of the structure of the optical lens assembly and the solar cell multiplexing system of the present invention;

FIG. 3 is a schematic view of a splice;

FIG. 4 is a schematic view of the structure of a laser resonator in accordance with example 1;

FIG. 5 is a schematic view of the structure of a laser resonator in accordance with example 2;

FIG. 6 is a schematic view showing a modified structure of a laser resonator in accordance with embodiment 2;

FIG. 7 is a schematic view of the structure of a laser resonator in accordance with embodiment 3;

FIG. 8 is a schematic front view of a planar grating gain medium array in accordance with example 1;

FIG. 9 is a schematic view of a gain medium series connection perspective;

FIG. 10 is a schematic diagram of the structure of a hollow cylindrical gain medium array in example 4;

FIG. 11 is a schematic diagram of the three-dimensional structure of the hollow cylindrical gain medium array in example 4

FIG. 12 is a schematic diagram showing a modified structure of the hollow cylindrical gain medium array of example 4;

FIG. 13 is a schematic structural view of another modification of the hollow cylindrical gain medium array of example 4;

FIG. 14 is a schematic diagram showing the structure of a hollow truncated cone-shaped gain medium array according to example 5;

FIG. 15 is a schematic diagram of the structure of a plurality of hollow truncated cone-shaped gain medium arrays connected in series according to example 5;

FIG. 16 is a schematic structural view of a laser beam combining unit;

FIG. 17 is a graph of solar spectrum;

FIG. 18 is a graph showing a room-temperature absorption spectrum of a Nd: YAG crystal.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

It will be understood that terms like "first," "second," "further," and the like, used in the specification to refer to a sequence, and terms like "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and the like, which refer to an orientation or a positional relationship, are used for convenience of description only and do not indicate or imply that the referenced device or element must have a particular orientation, configuration, and operation in a particular orientation; unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and thus should not be construed as limiting the invention.