CN117277033A - Panel gain module based on surface pumping multi-angle gating and high-energy laser device - Google Patents
Panel gain module based on surface pumping multi-angle gating and high-energy laser device Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
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- H—ELECTRICITY
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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Abstract
The invention discloses a panel gain module based on surface pumping multi-angle gating and a high-energy laser device. The device comprises a seed source system, an amplifying link and a green light output system; wherein the seed source system and the amplifying link respectively comprise a first and a second slat gain modules; the fundamental frequency laser output by the seed source system is amplified for multiple times by a second slat gain module in the amplifying link and then is transmitted to the green light output system to output green light. The slab gain module comprises a pump source and a gain medium slab; the pump light generated by the pump source is injected into the gain medium strip in a large-surface pumping mode, and the gain medium strip is in a Zig-Zag strip configuration. The invention obtains uniform pumping gain through large-area pumping of the slab gain, realizes self-compensation and multi-pass extraction of aberration of laser in the thickness direction along a Zig-Zag light path in the slab and the characteristics of whole-course image transmission, greatly improves output energy and efficiency, and finally realizes high-energy green light output with high beam quality and high efficiency.
Description
Technical Field
The invention relates to the technical field of high-energy laser, in particular to a panel gain module based on surface pumping multi-angle gating and a high-energy green laser device.
Background
The high-energy green light source with high beam quality has the advantages of short wavelength, high photon energy, strong focusing capability and the like, and can be widely applied to the fields of semiconductor processing, active beacons, marine surveying, isotope separation and the like. With the increasing demands of the fields of industrial processing, military national defense and the like on the laser, higher demands are put on indexes such as power, beam quality, volume, weight and the like of the laser. YAG rod-shaped lasers obtain 532nm green light output through frequency multiplication, and have the advantages of simple configuration and easy realization of laser output, but the emission angle becomes large and the uniformity is reduced when the laser works due to the thermal lens effect of the rod-shaped gain medium along with the improvement of laser energy and repetition frequency, so that the frequency multiplication efficiency and the far-field beam quality are seriously affected; meanwhile, the beam quality of the rod-shaped laser is greatly influenced by the working point of the module, and the rod-shaped laser can only work at a fixed working point and cannot perform large-scale frequency modulation and energy modulation, so that the application range of the rod-shaped laser is greatly limited. Therefore, there is a need to design new solid green laser configurations, developing new high energy, highly robust green light sources.
The slab laser configuration is a novel two-dimensional laser configuration, has extremely strong heat management capability, and can meet the requirements of high energy and high repetition frequency output. The common slab laser configurations have a straight-through type and a Zig-Zag type, and the straight-through type light-passing configuration is similar to a rod-shaped laser, and a certain thermal lens effect can be generated; the Zig-Zag light-passing mode is that light rays are passed through the strip in a zigzag path, and the light-passing mode can realize self-compensation of thermal aberration of the light beam, so that the quality degradation and thermal defocusing effect of the light beam caused by heat loading are greatly reduced. Meanwhile, the lath can realize that the energy storage of large energy is favorable for realizing the laser output of large energy, and the light-passing area is large, so that the problem of film damage under the condition of large energy output is favorable for being relieved. Green lasers based on slab configurations are therefore an effective way to achieve high energy green light output. In the prior art, for example, patent CN201811508678.5 discloses a high-power slab green laser, which adopts a mode of directly connecting to a slab resonant cavity, the beam quality is difficult to guarantee, and thermal defocus cannot be eliminated; patent CN2012210577575.0 discloses a slat green light configuration based on M-type light transmission, which is still a straight-through light transmission configuration in nature. Although the two green laser configurations have obvious technical progress, the two green laser configurations still have certain defects in the aspects of beam quality control and stability control. Therefore, there is a need to design a thermally stable slab laser configuration that achieves both high beam quality and high energy output.
Disclosure of Invention
The invention aims at: aiming at the defects and shortcomings in the prior art, the invention provides a compact high-energy green laser device based on a large-surface pumping Zig-Zag lath configuration, and uniform pumping gain is obtained by pumping the lath on the large surface, so that the compact design of the high-energy green laser device is possible; then utilizing laser to realize self-compensation of aberration along the thickness direction in a Zig-Zag light path in the strip; the quality of the laser beam is improved by matching with the whole image transmission characteristic; and most importantly, the multi-pass extraction is realized by utilizing the multi-gate angle characteristic of the strip, the output energy and efficiency are greatly improved, and finally, the high-energy green light output with high beam quality and high efficiency is realized.
In one aspect, the present invention provides a slab gain module comprising a pump source and a slab of gain medium; the gain medium plate strip is characterized in that pump light generated by the pump source is injected into the gain medium plate strip in a large-surface pumping mode; the gain medium panel is in a Zig-Zag panel configuration. The large surface is a surface with the largest projection or larger projection of the gain medium sheet bar, and the surface with the smallest length, width and height is referred to as a thickness, i.e., a surface perpendicular to the thickness direction.
Preferably, the gain medium strip is connected with a heat sink cooler in a sealing way.
Preferably, at least one laser light passing surface of the gain medium strip is plated with a polarization selection film.
In another aspect, the present invention also provides a high-energy laser apparatus, including a seed source system, an amplifying link, and a green light output system; the amplifying link comprises the slat gain module; and the fundamental frequency laser output by the seed source system is amplified for multiple times by a slat gain module in the amplifying link and then is transmitted to the green light output system to output green light.
Preferably, the amplifying link includes at least one stage of image transfer system, each stage of image transfer system imaging the fundamental laser to the green light output system step by step along the optical path; and the image transmission system is arranged in the light path of each path of laser among the laser incident to the slab gain module and the laser emitted by the slab gain module.
Preferably, the image transmission system comprises an imaging module, the imaging module comprises an X-direction imaging cylindrical lens and a Y-direction imaging cylindrical lens, imaging multiplying powers of the two imaging cylindrical lenses are different, focusing positions of the two imaging cylindrical lenses are different, and focal lines are perpendicular to the light path.
Preferably, the amplifying link comprises at least one magneto-optical isolation system, and the magneto-optical isolation system isolates reverse return light; at least one magneto-optical isolation system is connected to the output end of the seed source system for outputting the fundamental frequency laser.
Preferably, the seed source system comprises a resonant cavity, wherein the resonant cavity is internally provided with the strip gain module without coating, a Q-switched crystal and a wedge mirror pair; the resonant cavity, the lath gain module, the Q-switched crystal and the wedge mirror pair are arranged on the same optical path; the Q-switched crystal and the wedge mirror are respectively positioned at two sides of the lath gain module, and the wedge mirror is opposite to one side of the resonant cavity, which is close to the emergent direction; and a gain medium plate strip of the plate gain module is plated with the polarization selection film by a laser light transmission surface at the side of the Q-switched crystal.
Preferably, the green light output system multiplies the input fundamental frequency laser by a frequency multiplication module to output green light.
Preferably, the frequency doubling module comprises a nonlinear frequency doubling crystal and a frequency doubling crystal temperature control piece, and the frequency doubling crystal temperature control piece is connected to the periphery of the nonlinear frequency doubling crystal.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. compared with the prior art, the invention mainly adopts a multi-angle gating lath configuration based on large-surface pumping as a main amplification gain module, the relatively uniform pumping light injection can be realized by carrying out large-surface pumping on the lath, and pumping light coupling can be completed by only one waveguide, so that a gain system is simplified.
2. The panel gain module based on the surface pumping multi-angle gating and the high-energy laser device provided by the invention utilize the characteristic that the Zig-Zag light path in the panel has a plurality of gating angles, and the seed light passes through the main amplifying panel for multi-stage amplification for multiple times, so that the extraction efficiency of laser is improved, and the factors such as complex system caused by multi-stage amplification are avoided.
3. The panel gain module based on the surface pumping multi-angle gating and the high-energy laser device provided by the invention adopt a mixed image transmission system, so that not only is the uncontrolled quality of a light beam caused by free transmission avoided through laser image transmission, but also the focus air breakdown effect is avoided through the separate imaging in the X and Y directions.
4. The invention not only can realize large energy output, but also ensures the compactness and stability of the system and ensures that the output laser has better beam quality for the design of a seed source system, an amplifying link and a green light output system.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is one embodiment of a high energy laser device optical path design based on surface pumped multi-angle gating.
Fig. 2 is one embodiment of a structure of a gain medium slab.
Fig. 3 is one embodiment of a slat gain module structure.
Fig. 4 is one embodiment of an imaging module.
Fig. 5 is an embodiment of a frequency doubling module.
In the figure: 1. the system comprises a reflector, 2, a Q-switched crystal, 3, a diaphragm, 4, a wedge lens pair, 5, an output lens, 6, fundamental frequency laser, 7, a primary magneto-optical isolation system, 8, a first reflector, 9, a second reflector, 10, a third reflector, 11, a fourth reflector, 12, a fifth reflector, 14, a sixth reflector, 15, a seventh reflector, 13, a secondary magneto-optical isolation system, 16, a first X-direction imaging cylindrical lens, 17, a first Y-direction imaging cylindrical lens, 18, a frequency doubling module, 19, green light, 20, a pump source, 21, a homogenizing waveguide, 22, pump light, 23, a gain medium strip, 24, a heat sink cooler, 25, an X-direction imaging cylindrical lens, 26, a Y-direction imaging cylindrical lens, 27, light, 28, a frequency doubling crystal temperature control element, 29, a nonlinear frequency doubling crystal, 30, a beam splitting reflector, G1, a first strip gain module, G2, a second strip gain module, A, a polarization selection film, L1, a fourth imaging module, L2, a third imaging cylindrical lens, L3, a sixth imaging module, a seventh imaging module, a fourth imaging module, a fifth imaging module, a sixth imaging module, a third imaging module, a fourth imaging module, a fifth imaging module, a fourth imaging module, a sixth imaging module, and a fourth imaging module, and a fifth imaging module, and a fourth imaging module.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings, and based on the embodiments in the present application, other similar embodiments obtained by those skilled in the art without making creative efforts should fall within the scope of protection of the present application.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; the device can be mechanically connected, electrically connected, physically connected or wirelessly connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1
The embodiment provides a large-energy laser device based on surface pumping multi-angle gating, which generates fundamental frequency laser with small energy through a seed source system as seed light, then amplifies the fundamental frequency laser for multiple times by using an amplifying link, and finally converts the amplified fundamental frequency laser into green light with large energy by using a green light output system for outputting. Thus, the device can be described in three parts.
The seed source system includes a resonant cavity that is a large mode volume positive-branch confocal unstable cavity, which may be formed by a laser mirror 1 and an output mirror 5 in some embodiments, as shown in fig. 1, with seed light being output by the output mirror 5. On the optical path in the resonant cavity, a Q-switched crystal 2, a diaphragm 3, a first slab gain module G1 and a wedge lens pair 4 are arranged, the directions from the laser reflector 1 to the output lens 5 are respectively positioned at two sides of the first slab gain module G1, and the wedge lens pair 4 is close to one side of the exit direction of the resonant cavity.
The Q-switched crystal 2 is used for switching off or switching on a resonant cavity, an active Q-switched mode and a passive Q-switched mode can be selected, and the Q-switched crystal 2 can be selected from LN, RTP, cr, YAG and the like.
The first slab gain module G1 performs gain control on the laser by adopting a large-area pumping mode, and the design principle is that pump light 22 generated by a pump source 20 is injected into a gain medium slab 23 in a large-area pumping mode, and the gain medium slab 23 is in a Zig-Zag slab configuration with a multi-gating angle characteristic so as to perform multi-pass pumping gain on the laser.
As shown in fig. 2, assuming that the refractive index of the gain medium stripe 23 is n, the first pass uses an incident angle parallel to the large surface during the multiple passes selection, the angle of the end surface of the gain medium stripe 23 is θ, the length is l, the thickness is d, and m represents the number of turn-back cycles of the laser light in the gain medium stripe 23 (the number of cycles is 3 in the figure). The structural design for the gain medium strip 23 satisfies the following relationship:
l=d*ctgθ+(2m+1)*d*tg(θ+arcsin((sinθ)/n))，
assuming that three gating angles are used in design, namely three times of pumping gain is carried out on laser, the gain medium strip 23 has large energy storage and gating angles in practical application to meet the requirement of total reflection angles, the deviation between the minimum angle and the maximum angle is 20-40 degrees, and the m value is 3-6. Considering the problem of normal laser foldback in the gain medium slab 23 and suppressing the hidden trouble of self-oscillation caused by natural polarization selection, in order to avoid or mitigate the hidden trouble, the gain medium slab 23 is designed to use 35 ° < θ <55 °. With the above relation, in the case of material determination (i.e., refractive index determination), the relation among the length l, thickness d, and number of turn-back cycles of the gain medium slat 23 is defined accordingly. Typically, the length l and thickness d of the gain medium strip 23 will be limited by the size of the various parts of the device, i.e. typically the length l and thickness d are known, in which case the design for the gain medium strip 23 falls on an optimum design for the θ part, typically by solving for θ through the above relationship to ultimately determine the structure of the gain medium strip 23.
In one embodiment, as shown in fig. 3, the first slab gain module G1 includes a pump source 20, a gain medium slab 23 and a heat sink cooler 24, where the pump source 20 generates pump light 22 and uniformly injects the pump light into the gain medium slab 23 through a large surface, and a homogenizing waveguide 21 may be connected to the pump source 20 to homogenize the pump light 22 generated by the pump source 20, and then inject the formed uniform pump light 22 into the gain medium slab to generate laser gain. The gain medium strips 23 and the heat sink cooler 24 are connected by brazing or other sealing modes to achieve the purpose of heat dissipation.
In addition, a polarization selection film a is plated on the laser light passing surface of the gain medium strip 23 near the laser mirror 1 for polarization selection in the Q-switching process (especially, active Q-switching). The design of the film layer directly reduces the insertion of the polarizer in the cavity, and simplifies the configuration of the resonant cavity and the laser path. Meanwhile, it is preferable to plate the polarization selection film a on the end of the gain medium plate 23 near the laser mirror 1 (i.e., on the side of the Q-switched crystal 2), which serves to reduce the possibility of forming self-oscillation.
The working principle of the seed source system is as follows: the pump light 22 generated by the pump source 20 (homogenized by the homogenizing waveguide 21) irradiates the gain medium strip 23 to generate gain, the laser reflector 1 and the output mirror 5 form a resonant cavity, the optical axis in the cavity is adjusted by the wedge mirror 4 to enable the laser in the cavity to reach the output condition, meanwhile, the Q-switched crystal 2 is used for switching off and switching on the output in the cavity to reach the condition of outputting short pulse laser, and the short pulse seed light is output as the fundamental frequency laser 6.
One of the most important parts of the whole device is an amplifying link part, which performs multi-pass amplification and image transmission on the fundamental laser 6. The amplification link includes a second slat gain module G2, and a multi-stage image transfer system. The second panel gain module G2 is substantially identical in structure to the first panel gain module G1, except that: the gain medium slab 23 (main discharge slab for short), the heat sink cooler 24, the pump source 20, and the homogenizing waveguide 21 of the second slab gain module G2 have larger gauge, and at the same time, the polarization selection film a is not plated on the end face of the gain medium slab 23. The fundamental laser 6 is amplified through the main amplifying slat multiple times (more than two times) at different gating angles in the amplifying link according to the characteristics of the multiple gating angles of the main amplifying slat. Compared with a straight-through structure (the maximum two-pass amplification can be realized), the multi-pass amplification of the main amplification strip can extract the laser energy in the strip to the maximum extent on one hand, and can reduce the amplification stage number on the other hand, for example, the pre-amplification stage is reduced, the ideal amplification effect can be realized only by amplifying the primary gain medium strip 23, and the compactness of the system is greatly improved. The various stages of image transmission systems strictly image the phase at the seed light outlet inside the gain medium lath 23 of the second lath gain module G2 through a geometric imaging system and image the phase to a green light output system step by step, so that uncontrollable degradation of the quality of a light beam caused by complex evolution of aberration in the free transmission process of laser is reduced. The fundamental frequency laser 6 transmitted to the second slab gain module G2 by the seed source system, the laser of each pass input to the second slab gain module G2, and the laser transmitted to the green light output module by the second slab gain module G2 (i.e. the laser incident to the second slab gain module G2 and the laser emitted by the second slab gain module G2), at least one path of laser has an image transmission system disposed in its optical path. As shown in fig. 1, an image transfer system is generally provided in each of these optical paths.
In some embodiments, the image delivery system belongs to a hybrid image delivery system, which includes an imaging module L, as shown in fig. 4, which includes an X-direction imaging cylindrical lens 25 and a Y-direction imaging cylindrical lens 26 (the order of laser light passing through the two is exchangeable), and the imaging modules L typically appear in pairs. In Zig-Zag lath angle gating, the spot size of different gating angles in the X direction is changed, and the imaging multiplying power of two imaging cylindrical lenses is designed to be different, so that the distance difference between the two lenses is realized; in addition, the focusing positions of the two imaging cylindrical lenses are designed to be different, and the focal lines are perpendicular to the light path (namely the laser transmission direction). Compared with single ball lens imaging, the advantages of the design are: (1) 4f imaging with different multiplying powers can be respectively realized in two directions of the light spot, and the two directions can be respectively shaped; (2) The two imaging cylindrical lenses are different in focusing positions and focus lines are formed at the focusing positions (the spherical lenses are the same focus), so that the energy density of the focusing positions is reduced, and the system instability caused by high laser power density breakdown air is prevented.
As shown in fig. 1, the second slab gain module G2 is designed to amplify the fundamental laser light 6 three times, and it is obvious that other amplification pass numbers can be designed, which is only an example for illustrating the design principle of the amplification link. In fig. 1, the first imaging module L1 and the second imaging module L2 form a first-stage image transmission system, which cooperates with the first mirror 8 and the second mirror 9 to transmit an image of seed light (fundamental frequency laser 6) emitted from the seed source system to the entrance of the main discharge slat, and to shape a small light spot of the seed light to a large light spot with the cross-sectional size of the main discharge slat. The third imaging module L3 and the fourth imaging module L4 form a second-stage image transmission system (i.e. the laser light paths of the outgoing and the returning-in main placing laths are respectively provided with an imaging module L), which is matched with the third reflecting mirror 10 and the fourth reflecting mirror 11 to transmit the laser image of the primary placing lath outgoing for one pass to the main placing lath for two-pass amplification, and in the process, the parameters and the positions of the imaging elements in the X and Y directions are different by utilizing the dimensional changes of the X directions of different passes. The fifth imaging module L5 and the sixth imaging module L6 form a third-stage image transmission system, which cooperates with the fifth reflecting mirror 12 and the sixth reflecting mirror 14 to transmit the laser image of the two-pass outgoing main-placement slat to the main-placement slat for three-pass amplification, and the process variation is similar to that of the second-stage imaging system. Finally, the seventh imaging module L7, the first X-direction imaging cylindrical lens 16, and the first Y-direction imaging cylindrical lens 17 form a fourth-stage image transmission system, which cooperates with the seventh reflecting mirror 15 to transmit the fundamental frequency laser 6 image amplified three times to the green light output system, and simultaneously, reshape the amplified light spot into a light spot size required by laser conversion (frequency multiplication). In addition, the positions of the first X-direction imaging cylindrical lens 16 and the first Y-direction imaging cylindrical lens 17 can be adjusted, respectively, and defocus compensation for the amplified output laser light can be realized.
In addition, the amplifying link is also provided with a magneto-optical isolation system for isolating the reverse return light, and in theory, the magneto-optical isolation system can be arranged in the amplifying link wherever the position where the reverse return light needs to be isolated is related in the optical path. In the present embodiment, a two-stage magneto-optical isolation system, a primary magneto-optical isolation system 7 and a secondary magneto-optical isolation system 13 are provided in the amplification link. The device has the advantages that reverse return light (caused by residual reflection of certain normal incidence mirror surfaces) cannot pass through the isolator through the magneto-optical polarization selection characteristic of the isolator, unidirectional transmission of laser is guaranteed, and damage and energy loss to a seed source system and other devices caused by the amplified return light are avoided. Specifically, the primary magneto-optical isolation system 7 is disposed behind the fundamental frequency laser 6 (i.e., before the first primary image transmission system) output by the seed source system, and the secondary magneto-optical isolation system 13 is disposed in an optical path of the laser (i.e., the optical path where the third primary image transmission system is located) of the laser that exits the main slab for the second pass (i.e., the laser that is input to the slab gain module again for the last pass); the primary magneto-optical isolation system 7 plays a role in preventing return light from reversely returning to the seed source, which is a magneto-optical isolation system which is required to be designed, and the secondary magneto-optical isolation system 13 plays a role in preventing reverse transmission of three-way amplified return light and frequency multiplier return light (continuous), and is an optional magneto-optical isolation system. In addition, for three-pass amplification (other passes are the same), at least one magneto-optical isolation system may be provided between one pass and two pass, between two pass and three pass, or after three pass. For the case of designing other amplification pass numbers, the number and positions of the other stages of magneto-optical isolation systems may be adjusted based on the same purpose (anti-return light) except that the stage of magneto-optical isolation system 7 may be unchanged. As a preferred design, except that the positions of the primary magneto-optical isolation systems 7 are fixed, the number and positions of all the magneto-optical isolation systems are determined according to the principle of balancing the return light pressure, that is, the return light pressure expected to be born by each magneto-optical isolation system is approximately the same, for example, in the embodiment shown in fig. 1, the primary magneto-optical isolation system 7 bears the return light pressure of one pass and two pass, the secondary magneto-optical isolation system 13 bears the return light pressure of three-way and green light output systems, and if the secondary magneto-optical isolation system 13 is arranged between the third reflector 10 and the fourth reflector 11, the return light pressure of two passes born by the primary magneto-optical isolation system 7 is born by the secondary magneto-optical isolation system 13 instead, which leads to unbalance of the return light pressures born by the two-stage magneto-optical isolation systems.
The working principle of the amplifying link is as follows: in the second slab gain module G2, the pump light 22 generated by the pump source 20 irradiates the gain medium slab 23 to generate gain, the low-energy fundamental frequency laser 6 output by the seed source system is injected into the main amplifying slab through the first-stage image transmission system (including the first imaging module L1 and the second imaging module L2), the first reflecting mirror 8 and the second reflecting mirror 9, namely, the light spots matched with the main amplifying slab are amplified in a one-pass manner, amplified in the one-pass manner, then is injected into the main amplifying slab through the second-stage image transmission system (including the third imaging module L3 and the fourth imaging module L4), the third reflecting mirror 10 and the fourth reflecting mirror 11 again to be amplified in a two-pass manner, then is injected into the main amplifying slab through the third-stage image transmission system (including the fifth imaging module L5 and the sixth imaging module L6), the fifth reflecting mirror 12 and the sixth reflecting mirror 14 again to be amplified in a three-pass manner, amplified in the three-pass manner, and finally is amplified in the four-pass manner through the fourth-stage image transmission system (including the seventh imaging module L7, the first X-direction imaging column 16 and the first Y-direction lens 17) and the seventh imaging column 17, and the output the light beam is amplified in the seven-direction and the light beam is amplified in the seven-energy fundamental frequency and the light beam is amplified in the seventh direction and is matched with the light beam system with the beam 1064 nm. The two-stage magneto-optical isolation system (namely the primary magneto-optical isolation system 7 and the secondary magneto-optical isolation system 13) plays a role in isolating return light.
The number of passes of the amplifying link is not limited to three, and more passes may be selected according to the number of main discharge slat gating angles. Preferably, the four times are generally not exceeded, taking into account the complexity of the device and the benefits of energy extraction.
The last part is the green light output system. The laser output by the amplifying link is still fundamental frequency laser, and a green light output system is required to perform frequency conversion to obtain green light.
The green light output system multiplies the input fundamental frequency light 27 by the frequency multiplication module 18 to green light output. Specifically, as shown in fig. 5, the frequency doubling module 18 is composed of a nonlinear frequency doubling crystal 29 and a frequency doubling crystal temperature controlling member 28, and the frequency doubling crystal temperature controlling member 28 is connected to the periphery (circumference) of the nonlinear frequency doubling crystal 29, and is used for keeping the temperature of the nonlinear frequency doubling crystal 29 constant. The frequency doubling crystal may be: LBO, BBO, KTP, etc. The frequency doubling module 18 is used for enabling 1064nm fundamental frequency light 27 to pass through the nonlinear frequency doubling crystal 29, and utilizing nonlinear effect to double frequency of the 1064nm fundamental frequency light 27 into high-energy 532nm green light 19 to be output.
The green light output system further comprises a light splitting mirror 30 which acts to transmit the un-doubled 1064nm fundamental light and to reflect the 532nm green light 19 out.
So far, the design principle of three major parts of the device is introduced, and the working principle of the device is as follows: the first slab gain module G1 and the second slab gain module G2 are injected into a gain medium slab 23 through pump light 22 to generate laser gain, a resonant cavity is formed by a laser reflector 1 and an output mirror 5 in a seed source system, and short pulse seed 1064nm fundamental frequency laser 6 is output by the aid of the Q-switched crystal 2, a diaphragm 3 and a wedge mirror pair 4; the seed 1064nm fundamental frequency laser 6 passes through the second slat gain module G2 three times and is amplified to obtain high-energy 1064nm fundamental frequency light 27; thereafter, the high-energy 1064nm fundamental light 27 is subjected to nonlinear action of the frequency doubling module 18 to obtain high-energy 532nm green light 19, and is led out through the spectroscope 30.
Example 2
This embodiment provides another high-energy laser device based on surface-pumped multi-angle gating, which is substantially identical to the structure of the device in embodiment 1, with the only difference that in the device of this embodiment, the fundamental laser light 6 output by the seed source system is directly input into the main amplifying slat parallel to the main amplifying slat without passing through the first mirror 8 and the second mirror 9.
Alternatively, in another embodiment, the fundamental laser light 6 is incident into the main discharge strip via a first mirror 8.
The above-described modification concept is equally applicable to the fourth-stage image transfer system section, i.e., the seventh mirror 15 is omitted, and the positions of the first X-direction imaging cylindrical lens 16, the first Y-direction imaging cylindrical lens 17, and the green light output system are correspondingly adjusted.
The idea of an embodiment is that part of the optics in the optical path may be omitted and modified according to the adjustment of the positional relationship between the three parts of the device.
Example 3
The present embodiment provides another high-energy laser device based on surface-pumped multi-angle gating, which is substantially identical to the structure of the device in embodiment 1, and the only difference is that in this embodiment, the amplifying link amplifies the laser light 4 times, and correspondingly, on the basis of fig. 1, on the optical path, a fifth-stage image transmission system is further provided on the side of the second slat gain module G2 close to the second-stage image transmission system, where the structure of the fifth-stage image transmission system is identical to that of the third-stage image transmission system in embodiment 1 (excluding the second-stage magneto-optical isolation system 13), and meanwhile, the original fourth-stage image transmission system needs to be adjusted to the other side of the second slat gain module G2 (close to the third-stage image transmission system). The secondary magneto-optical isolation system 13 originally arranged in the third-stage image transmission system can be omitted, and is designed in the light path of the fifth-stage image transmission system (the primary magneto-optical isolation system 7 increases the return light pressure of the tee joint), and can also keep the current situation, and is continuously arranged in the light path of the third-stage image transmission system (the secondary magneto-optical isolation system 13 increases the return light pressure of the four-way joint). Of course, a first-stage magneto-optical isolation system 7 may be added, and the latter two-stage magneto-optical isolation system may be respectively disposed in the second-stage image transmission system and the fifth-stage image transmission system. The transmission sequence of the optical path becomes: the seed source system-the first-stage image transmission system-the second-stage image transmission system-the third-stage image transmission system-the second-stage image transmission system-the fifth-stage image transmission system-the second-stage image transmission system-the fourth-stage image transmission system-the green light output system.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Claims (10)
1. A panel gain module based on surface pumping multi-angle gating, comprising a pump source (20) and a gain medium panel (23); the gain medium plate strip (23) is characterized in that pump light (22) generated by the pump source (20) is injected into the gain medium plate strip in a large-area pumping mode; the gain medium strip (23) is in the form of a Zig-Zag strip.
2. The panel gain module based on surface pumped multi-angle gating according to claim 1, characterized in that the gain medium panel (23) is sealingly connected with a heat sink cooler (24).
3. Panel gain module based on surface-pumped multi-angle gating according to claim 1 or 2, characterized in that at least one laser light-passing surface of the gain medium panel (23) is coated with a polarization-selective film.
4. A high-energy laser device, which is characterized by comprising a seed source system, an amplifying link and a green light output system; the amplification link comprising the slat gain module of claim 1 or 2; and the fundamental frequency laser output by the seed source system is amplified for multiple times by a slat gain module in the amplifying link and then is transmitted to the green light output system to output green light.
5. The high energy laser device of claim 4, wherein said amplifying link includes at least one stage of image delivery system, each stage of said image delivery system imaging fundamental laser light stepwise along an optical path to said green light output system; and the image transmission system is arranged in the light path of each path of laser among the laser incident to the slab gain module and the laser emitted by the slab gain module.
6. The high-energy laser device of claim 5, wherein the image transfer system comprises an imaging module comprising an X-direction imaging cylindrical lens (25) and a Y-direction imaging cylindrical lens (26), the imaging magnification of the two imaging cylindrical lenses being different, the focal positions of the two imaging cylindrical lenses being different and the focal lines being perpendicular to the optical path.
7. The high energy laser device of claim 4, wherein said amplification link includes at least one magneto-optical isolation system that isolates reverse return light; at least one magneto-optical isolation system is connected to the output end of the seed source system for outputting the fundamental frequency laser.
8. The high energy laser device of claim 4, wherein said seed source system comprises a resonant cavity having disposed therein a slab gain module as defined in claim 3, and a Q-switched crystal (2) and wedge mirror pair (4); the resonant cavity, the lath gain module, the Q-switched crystal (2) and the wedge mirror pair (4) are arranged on the same optical path; the Q-switched crystal (2) and the wedge lens pair (4) are respectively positioned at two sides of the lath gain module, and the wedge lens pair (4) is close to one side of the emergent direction of the resonant cavity; and a gain medium plate strip (23) of the plate gain module is plated with the polarization selection film by a laser light transmission surface at the side of the Q-switched crystal (2).
9. The high energy laser device of claim 4, wherein the green light output system multiplies the input fundamental frequency laser light into a green light output using a frequency multiplication module (18).
10. The high energy laser device of claim 9, wherein the frequency doubling module (18) comprises a non-linear frequency doubling crystal (29) and a frequency doubling crystal temperature controlling element (28), the frequency doubling crystal temperature controlling element (28) being connected around the non-linear frequency doubling crystal (29).
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Application publication date: 20231222 |