CN116780322A - Seed injection type high-energy pulse laser based on double piezoelectric ceramic annular cavity - Google Patents
Seed injection type high-energy pulse laser based on double piezoelectric ceramic annular cavity Download PDFInfo
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Abstract
The invention discloses a seed injection type high-energy pulse laser based on a double piezoelectric ceramic annular cavity, which solves the problem that the output power of the laser is low and the quality of an output beam of laser is affected in the prior art. The invention comprises a light source input cavity and a secondary resonant cavity, wherein the secondary resonant cavity is positioned at the inner side of the light source input cavity and corresponds to the light source input cavity; the light source input cavity is internally provided with a seed source, an optical fiber amplifier, a beam expanding system, an isolation system, a first high-reflection mirror, a first light splitting system and a second high-reflection mirror in sequence, and the outer side of the first light splitting system is provided with a first aspheric lens; a second aspheric lens is arranged on the outer side of the slave resonant cavity; the second high-reflection mirror corresponds to the acousto-optic Q-switch, and the acousto-optic Q-switch, the cavity length control system, the energy supply system, the first aspheric lens and the second aspheric lens are all connected with the control system. The device utilizes the light source input cavity and the slave resonant cavity to be matched for use, so that the utilization efficiency of laser is increased.
Description
Technical Field
The invention relates to the technical field of pulse lasers, in particular to a seed injection type high-energy pulse laser based on a double-piezoelectric ceramic annular cavity.
Background
Currently, a high-repetition-frequency and high-energy single longitudinal mode laser is an ideal laser light source, but due to the single longitudinal mode technology, the film selection technology can increase the intracavity loss so that the output of the single longitudinal mode laser is lower. The advent of seed-injected single longitudinal mode laser technology has addressed this pain. The technology has the characteristics of narrow linewidth, high power, long coherence length and the like. At present, the single longitudinal mode laser of the seed injection technology is mostly applied to laser radars and is transversely applied to a plurality of fields such as aviation, aerospace, wind tunnels and the like. Has wide application value.
The existing seed injection technology laser consists of a resonant cavity mostly consisting of a straight cavity, a U-shaped cavity, an annular cavity and the like. Most seed injection secondary resonant cavities adopt structures other than annular cavities due to high requirements on optical path precision of the annular cavities and great adjustment difficulty. The existing annular cavity is regulated by single-piezoelectric ceramic, so that the output power of the laser is low, and the output beam quality of laser is influenced by a large creep effect.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides a seed injection type high-energy pulse laser based on a double-piezoelectric ceramic annular cavity, which solves the problems that the output power of the laser in the prior art is low, and the quality of the output beam of laser is influenced by a larger creep effect.
The technical scheme of the invention is realized as follows: a seed injection type high-energy pulse laser based on a dual-piezoelectric ceramic annular cavity comprises a control system, a light source input cavity and a secondary resonant cavity, wherein the secondary resonant cavity is positioned at the inner side of the light source input cavity, and a pumping source and an optical fiber coupler which correspond to each other are arranged outside the secondary resonant cavity; the light source input cavity is internally provided with a seed source, an optical fiber amplifier, a beam expanding system, an isolation system, a first high-reflection mirror, a first light splitting system and a second high-reflection mirror in sequence, and the outer side of the first light splitting system is provided with a first aspheric lens; the sound-light Q-switch, the energy increasing system, the cavity length control system and the second light splitting system are sequentially arranged in the resonant cavity along the clockwise direction, a second aspheric lens is arranged on the outer side of the second light splitting system, and the energy supplying system is further arranged at the input end of the energy increasing system; the second high-reflection mirror corresponds to the acousto-optic Q-switch, and the acousto-optic Q-switch, the cavity length control system, the energy supply system, the first aspheric lens and the second aspheric lens are all connected with the control system;
seed light emitted by a seed source sequentially passes through an optical fiber amplifier, a beam expanding system, an isolation system and a first high reflection mirror to reach a first light splitting system, the first light splitting system divides a light beam into two beams of seed light, one beam of seed light enters a first aspheric lens as reference light, and the other beam of seed light is reflected into a slave resonant cavity through a second high reflection mirror; at the moment, the control system controls the acousto-optic Q modulation to be in an on state, seed light enters the energy increasing system through the acousto-optic Q modulation, pumping light emitted by the energy increasing system is increased to become resonance light, and the resonance light emitted by the energy increasing system sequentially passes through the cavity length control system and the second light splitting system and then enters the second aspheric lens to act on the resonance light;
when the frequency of the resonant light received by the control system is the same as that of the reference light, the control system turns off the acousto-optic Q-switch, the resonant light in the second light splitting system is emitted through the acousto-optic Q-switch, sequentially passes through the energizing system and the cavity length control system and then passes through the second light splitting system again, and the resonant light oscillates for a plurality of times from the resonant cavity, so that the resonant light emits target light from an output coupling mirror in the second light splitting system under the state of sufficient energy.
Further, the beam expanding system comprises a plano-concave lens and a plano-convex lens, wherein the input end of the plano-concave lens corresponds to the output end of the optical fiber amplifier, the output end of the plano-concave lens corresponds to the input end of the plano-convex lens, and the output end of the plano-convex lens corresponds to the input end of the isolation system.
Further, the isolation system comprises a P polaroid, an F-P optical rotator, a half wave plate I and an S polaroid which are sequentially arranged, wherein the input end of the P polaroid corresponds to the output end of the plano-concave lens, and the output end of the S polaroid corresponds to the input end of the first high-reflection mirror.
Further, the first light splitting system comprises a half-wave plate II and a first polarization light splitting piece which are arranged at one time, the input end of the half-wave plate II corresponds to the output end of the first high-reflection mirror, the linear output end of the first polarization light splitting piece corresponds to the input end of the second high-reflection mirror, and the polarization output end of the first polarization light splitting piece corresponds to the input end of the first aspheric lens.
Further, the energy supply system comprises a pumping source, the pumping source is connected with the control system, an optical fiber coupler I is arranged at the output end of the pumping source, and the output end of the optical fiber coupler I corresponds to the input end of the energy increasing system.
Further, the energy-reducing system comprises a first antireflection film mirror, a first pump end amplifier and a second antireflection film mirror which are sequentially and correspondingly arranged, wherein the input end of the first antireflection film mirror is respectively corresponding to the output end of the first optical fiber coupler and the output end of the acousto-optic Q-switch, the output end of the second antireflection film mirror is corresponding to the input end of the cavity length control system, and the first optical fiber coupler, the first antireflection film mirror, the first pump end amplifier and the second antireflection film mirror are all positioned in the same vertical light path.
Further, the cavity length control system comprises a first piezoelectric ceramic and a second piezoelectric ceramic, the first piezoelectric ceramic and the second piezoelectric ceramic are connected with the control system, the first piezoelectric ceramic and the second piezoelectric ceramic are respectively provided with a third high-reflection mirror, the third high-reflection mirror on the first piezoelectric ceramic and the third high-reflection mirror on the second piezoelectric ceramic are arranged in parallel, the input end of the third high-reflection mirror on the first piezoelectric ceramic corresponds to the output end of the second antireflection film mirror, the output end of the third high-reflection mirror on the first piezoelectric ceramic corresponds to the input end of the third high-reflection mirror on the second piezoelectric ceramic, and the output end of the third high-reflection mirror on the second piezoelectric ceramic corresponds to the second beam splitting system. The first piezoelectric ceramic, the second piezoelectric ceramic and the third high-reflection mirror connected to the first piezoelectric ceramic and the second piezoelectric ceramic are all inclined at 45 degrees.
Further, the second light splitting system further comprises a half-wave plate III, a fourth high-reflection mirror and a second polarization light splitting sheet which are sequentially arranged, the input end of the half-wave plate III corresponds to the output end of the output coupling mirror, the half-wave plate III and the fourth high-reflection mirror are arranged on the same horizontal light path, the output end of the fourth high-reflection mirror corresponds to the input end of the second polarization light splitting sheet, the linear output end of the second polarization light splitting sheet corresponds to the acousto-optic Q-switch, and the polarization output end of the second polarization light splitting sheet corresponds to the second aspheric lens.
Further, the control system comprises a control module, an acquisition module, a detection module and an optical fiber coupler, wherein the input end of the optical fiber coupler is connected with the second aspheric lens and the second aspheric lens, the output end of the optical fiber coupler is connected with the acquisition module, the acquisition module transmits signals to the control module through the detection module, and the control module is further connected with the first piezoelectric ceramic, the second piezoelectric ceramic, the acousto-optic Q-switching device and the pumping power supply.
The beneficial effects of the invention are as follows: the device utilizes the light source input cavity and the secondary resonant cavity to be matched for use, increases the energy utilization efficiency of laser, reduces the creep effect, and the control system utilizes the reference light in the light source input cavity and the resonant light in the secondary resonant cavity to complete the control of the acousto-optic Q-switching and energy supply system, thereby achieving the conversion from continuous light to pulse light. The seed light emitted by the seed source is amplified by the optical fiber amplifier and then enters the beam expanding system to be expanded, the seed light after beam expansion enters the isolation system, so that the interference of an on-site light path is avoided, the seed light emitted from the isolation system is changed in the direction of the light path by the first high-reflection mirror, the seed light after the light path is changed enters the first light splitting system, the first light splitting system splits the seed light, one beam of the seed light is taken as reference light to enter the first aspheric lens, the other beam of the seed light is reflected by the second high-reflection mirror to enter the secondary resonant cavity, the direction of the light path is changed by the first high-reflection mirror and the second high-reflection mirror, the distance between the light source input cavity and the secondary resonant cavity is shortened, the light loss is reduced, and the energy utilization rate is improved. The energy supply system provides energy for the energy increasing system, and then provides energy for the resonance light that is penetrated from the acousto-optic Q-switching, and then the energy of the resonance light of increase through the energy increasing system, control system control first piezoceramics and second piezoceramics, conveniently change the chamber length, and then be convenient for adjust the frequency of reference light and resonance light, realize the quick conversion of continuous light to pulsed light, make its frequency output more stable and less creep effect, realize the laser output that average power is higher, the frequency is more stable, can avoid space hole burning effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required for the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic view of the optical path of the present invention;
FIG. 2 is a control schematic diagram of the present invention;
fig. 3 is a schematic diagram of a control signal.
In the figure: 1. the optical fiber comprises a seed source, 2, an optical fiber amplifier, 3, a plano-concave lens, 4, a plano-convex lens, 5, a P polaroid, 6, an F-P optical rotatory device, 7, a half-wave plate I, 8, an S polaroid, 9, a first high reflection mirror, 10, a seed light source, 11, a first polarization beam splitter, 12, a first aspheric lens, 13, an acousto-optic Q-switch, 14, an antireflection film mirror I, 15, an end-pump end amplifier, 16, a first piezoelectric ceramic, 17, a second piezoelectric ceramic, 18, an output coupling mirror, 19, an optical fiber coupler I, 20, a half-wave plate II, 21, a second high reflection mirror, 22, an antireflection film II, 23, a second aspheric lens, 24, a third high reflection mirror, 25, a half-wave plate III, 26, a fourth high reflection mirror and 27 and a second polarization beam splitter.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, embodiment 1, a seed injection type high-energy pulse laser based on a dual piezoelectric ceramic ring cavity comprises a light source input cavity and a secondary resonant cavity, wherein the secondary resonant cavity is positioned at the inner side of the light source input cavity, and a pumping source 10 and an optical fiber coupler are correspondingly arranged outside the secondary resonant cavity; a seed source 1, an optical fiber amplifier 2, a beam expanding system, an isolation system, a first high-reflection mirror 9, a first light splitting system and a second high-reflection mirror 21 are sequentially arranged in the light source input cavity, and a first aspheric lens is arranged on the outer side of the first light splitting system; the sound-light Q13, the energy increasing system, the cavity length control system and the second light splitting system are sequentially arranged in the resonant cavity along the clockwise direction, a second aspheric lens is arranged on the outer side of the second light splitting system, and an energy supplying system is further arranged at the input end of the energy increasing system; the second high-reflection mirror 21 corresponds to the acousto-optic Q13, and the acousto-optic Q13, the cavity length control system, the energy supply system, the first aspheric lens and the second aspheric lens are all connected with the control system; the seed light emitted by the seed source 1 sequentially passes through the optical fiber amplifier 2, the beam expanding system, the isolation system and the first high-reflection mirror 9 to reach the first light splitting system, the first light splitting system divides the light beam into two beams of seed light, one beam of seed light enters the first aspheric lens as reference light, and the other beam of seed light is emitted into the resonant cavity through the second high-reflection mirror 21; at the moment, the control system controls the acousto-optic Q13 to be in an on state, seed light enters the energy increasing system through the acousto-optic Q13, pumping light emitted by the energy increasing system is increased to become resonance light, and the resonance light emitted by the energy increasing system sequentially passes through the cavity length control system and the second light splitting system and then enters the second aspheric lens to act on the resonance light; when the frequency of the resonant light received by the control system is the same as that of the reference light, the control system turns off the acousto-optic Q13, the resonant light in the second light splitting system is emitted through the acousto-optic Q13, sequentially passes through the energy increasing system and the cavity length control system, enters the second light splitting system, and emits the target light from the output coupling mirror 18 in the second light splitting system. The acousto-optic Q-switched off time is tens of ns, and the resonance light can travel a plurality of circles inside
The device utilizes the light source input cavity and the secondary resonant cavity to cooperate, so that the utilization efficiency of laser is increased, and the control system utilizes the reference light in the light source input cavity and the resonant light in the secondary resonant cavity to complete the control of the acousto-optic Q13 adjustment and the energy supply system, so as to achieve the conversion from continuous light to pulse light. The seed light emitted by the seed source 1 enters the beam expanding system to expand the beam after being amplified by the optical fiber amplifier 2, the seed light after the beam expansion enters the isolation system, so that the interference of a site light path is avoided, the seed light emitted from the isolation system is changed in the light path direction by the first high-reflection mirror 9, the seed light after the light path is changed enters the first light splitting system, the first light splitting system splits the seed light, one beam of the seed light is taken as reference light to enter the first aspheric lens 12, the other beam of the seed light is reflected by the second high-reflection mirror 21 to enter the slave resonant cavity, the light path direction is changed by the first high-reflection mirror 9 and the second high-reflection mirror 21, the distance between the light source input cavity and the slave resonant cavity is shortened, the light loss is reduced, and the energy utilization rate is improved.
In this embodiment, the beam expanding system includes a plano-concave lens 3 and a plano-convex lens 4, the input end of the plano-concave lens 3 corresponds to the optical fiber amplifier 2, the output end of the plano-concave lens 3 corresponds to the plano-convex lens 4, and the output end of the plano-convex lens 4 corresponds to the isolation system. The isolation system comprises a P polaroid 5, an F-P optical rotatory plate 6, a half wave plate 7 and an S polaroid 8 which are sequentially arranged, wherein the input end of the P polaroid 5 corresponds to the plano-concave lens 3, and the output end of the S polaroid 8 corresponds to the first high-reflection mirror 9. The seed light amplifies the laser through the optical fiber amplifier 2, and then the laser is subjected to beam expansion shaping through a beam expansion system formed by the plano-concave lens 3 and the plano-convex lens 4.
In this embodiment, the first light splitting system includes a half-wave plate two 20 and a first polarization beam splitter 11, which are sequentially arranged, the input end of the half-wave plate two 20 corresponds to the first high reflection mirror 9, the linear output end of the first polarization beam splitter 11 corresponds to the second high reflection mirror 21, and the polarization output end of the first polarization beam splitter 11 corresponds to the first aspheric lens 12. The energy supply system comprises a pump source 10, the pump source 10 is connected with the control system, an optical fiber coupler I19 is arranged at the output end of the pump source 10, and the output end of the optical fiber coupler I19 corresponds to the energy increasing system. The energy increasing system comprises an antireflection film mirror I14, a pump end amplifier and an antireflection film mirror II 22 which are sequentially and correspondingly arranged, wherein the input end of the antireflection film mirror I14 corresponds to an optical fiber coupler I19 and an acousto-optic Q-switch Q13 respectively, the output end of the antireflection film mirror II 22 corresponds to a cavity length control system, the optical fiber coupler, the antireflection film mirror I14, the pump end amplifier and the antireflection film mirror II 22 are all positioned in the same vertical optical path, and a pumping source emits energy into the antireflection film mirror I14, the pump end amplifier 15 and the antireflection film mirror II 22 through the optical fiber coupler I19 and enters seed light absorbed by the acousto-optic Q-switch, so that the energy of the seed light is increased to be resonant light, and redundant energy is emitted from the antireflection film II 22 in a straight line, so that the influence of the energy on the resonant light is avoided.
In this embodiment, the cavity length control system includes a first piezoelectric ceramic 16 and a second piezoelectric ceramic 17, where the first piezoelectric ceramic 16 and the second piezoelectric ceramic 17 are both connected to the control system, the first piezoelectric ceramic 16 and the second piezoelectric ceramic 17 are both provided with a third high reflection mirror 24, the third high reflection mirror 24 on the first piezoelectric ceramic 16 is parallel to the third high reflection mirror 24 on the second piezoelectric ceramic 17, and the input end of the third high reflection mirror 24 on the first piezoelectric ceramic 16 corresponds to the output end of the second antireflection film mirror 22, the output end of the third high reflection mirror 24 on the first piezoelectric ceramic 16 corresponds to the input end of the third high reflection mirror 24 on the second piezoelectric ceramic 17, and the output end of the third high reflection mirror 24 on the second piezoelectric ceramic 17 corresponds to the second spectroscopic system. The first piezoelectric ceramic 16, the second piezoelectric ceramic 17 and the third high-reflection mirror 24 connected to the first piezoelectric ceramic 16 and the second piezoelectric ceramic 17 are all inclined by 45 degrees, so that the change of the direction of the light path can be avoided while the cavity length is regulated, and further the output of target light is facilitated, and the first piezoelectric ceramic 16 and the second piezoelectric ceramic 17 are zirconium-titanium lead-acid piezoelectric ceramics.
In this embodiment, the second light splitting system further includes a half-wave plate three 25, a fourth high reflection mirror 26 and a second polarization beam splitter 27 that are sequentially disposed, where an input end of the half-wave plate three 25 corresponds to an output end of the output coupling mirror 18, the half-wave plate three 25 and the fourth high reflection mirror 26 are disposed on the same horizontal optical path, an output end of the fourth high reflection mirror 26 corresponds to an input end of the second polarization beam splitter 27, a linear output end of the second polarization beam splitter 27 corresponds to the acousto-optic Q13, and a polarization output end of the second polarization beam splitter 27 corresponds to the second aspheric lens 23.
As shown in fig. 2 and fig. 3, in embodiment 2, a control system of a seed injection type high-energy pulse laser based on a dual piezoelectric ceramic ring cavity includes a control module, an acquisition module, a detection module and an optical fiber coupler, wherein an input end of the optical fiber coupler is connected with a second aspheric lens and a second aspheric lens, an output end of the optical fiber coupler is connected with the acquisition module, the acquisition module transmits signals to the control module through the detection module, and the control module is further connected with a first piezoelectric ceramic, a second piezoelectric ceramic, an acousto-optic Q-switching device 13 and a pumping source. The control module is an FPGA, the FPGA is a field programmable gate array, the detection module is a balance detector, the acquisition module is a receiving Analog Digital (AD) card, the reference light and laser output after oscillation in the cavity are coupled by an aspheric lens and enter an optical fiber, the optical fiber coupler couples two beams of light and transmits the two beams of light to the balance detector for interference discrimination, and an interference signal is transmitted to the Analog Digital (AD) card for deriving the interference signal and converted into rectangular waves for transmission to the FPGA. The FPGA will typically trigger 13 the acousto-optic modulation Q13 on the rising or falling edge in the second scan cycle. The continuous resonance light is changed into pulse light after triggering and is output by the 18 output coupling mirror 18 after oscillation in the cavity. And an interface A in the FPGA controls a piezoelectric ceramic II 17, an interface B controls an acousto-optic Q13, a rectangular wave signal transmitted by an interface C controls a piezoelectric ceramic 16, and an interface D controls a piezoelectric ceramic 16. The energy supply system provides energy for the energy increasing system, and then provides energy for the resonance light that jets into from the acousto-optic Q13 that transfers, increase the energy of the resonance light that passes through the energy increasing system, control system control first piezoceramics 16 and second piezoceramics 17, conveniently change the chamber length, and then be convenient for adjust the frequency of reference light and resonance light, realize the quick transition of continuous light to pulsed light, make its frequency output more stable and less creep effect, realize the laser output that average power is higher, the frequency is more stable, can avoid space hole burning effect.
The device consists of the light path part of fig. 1 and the circuit part of fig. 2. As shown in fig. 1, the resonance light is generated by a seed source 1, the resonance light is the seed light at this time, the seed light amplifies laser light through an optical fiber amplifier 2, then the laser light is subjected to beam expansion shaping through a beam expansion system formed by a plano-concave lens 3 and a plano-convex lens 4, then the laser light is subjected to an isolation system formed by a P-polarizer 5, an F-P optical rotator 6, a half wave plate and an S-polarizer 8, and then the laser light reaches a beam splitting system formed by the half wave plate and a PBS through a high-reflection mirror, and part of the resonance light is split into an aspherical lens as reference light. The rest of the laser is injected from the resonant cavity by the high-reflection mirror and the acousto-optic Q-switch 13. The injected resonance light comes out from the acousto-optic Q-switch 13, enters an end pump end amplifier 15 for amplification through a seed light antireflection film mirror plated with the resonance light high reflection film, and then enters a cavity length control system composed of piezoelectric ceramics, piezoelectric ceramics and a high reflection mirror through another seed light antireflection film mirror plated with the resonance light high reflection film. The two high-reflection mirrors are respectively fixed on the two piezoelectric ceramics and are parallel to each other, and the mirror surface is 45 degrees with the horizontal direction. Subsequently, the laser light is reflected by the output coupling mirror 18 to the half wave plate, and the output coupling mirror 18 is the plano-concave lens 3 coated with a partial transmittance film for the wavelength of the resonance light. The half wave plate and the PBS form an intra-cavity beam splitting system, and the laser part which oscillates once in the cavity is output to reach the aspheric lens to interfere with the reference light output before. The light reaches the high-reflection mirror from the half wave plate, and finally reaches the acousto-optic Q13 to complete one-time oscillation in the cavity. The pump source 10 outputs energy required by crystal particle inversion through the optical fiber coupler, passes through the seed light antireflection film mirror coated with the resonance light high reflection film and reaches the end pump end amplifier 15, and finally the surplus energy is output from the other side mirror.
As shown in fig. 2, the reference light and the laser output after the oscillation in the cavity are coupled by the aspheric lens and enter the optical fiber, the optical fiber coupler couples the two beams of light and transmits the two beams of light to the balance detector for interference discrimination, and transmits the interference signal to the analog-digital AD card for deriving the interference signal, and the interference signal is converted into rectangular wave and transmitted to the FPGA. The FPGA will typically trigger 13 the acousto-optic modulation Q13 on the rising or falling edge in the second scan cycle. The continuous resonance light is changed into pulse light after triggering and is output by the 18 output coupling mirror 18 after oscillation in the cavity. An interface A in the FPGA controls the 17 piezoelectric ceramic 2, an interface B controls the 13 acousto-optic Q13, an interface C receives a rectangular wave signal transmitted by an analog digital AD card, an interface D controls the 16 piezoelectric ceramic 1, and an interface E controls the 10 pumping power supply. Fig. 3 is a schematic diagram of a control signal, where tq is the time for triggering the acousto-optic modulation Q in each period.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. A seed injection type high-energy pulse laser based on a dual-piezoelectric ceramic annular cavity comprises a control system, a light source input cavity and a secondary resonant cavity, wherein the secondary resonant cavity is positioned at the inner side of the light source input cavity; the method is characterized in that: a seed source (1), an optical fiber amplifier (2), a beam expanding system, an isolation system, a first high-reflection mirror (9), a first light-splitting system and a second high-reflection mirror (21) are sequentially arranged in the light source input cavity, and a first aspheric lens (12) is arranged on the outer side of the first light-splitting system; the sound-light Q (13), the energy increasing system, the cavity length control system and the second light splitting system are sequentially arranged in the resonant cavity along the clockwise direction, a second aspheric lens (23) is arranged on the outer side of the second light splitting system, and an energy supplying system is further arranged at the input end of the energy increasing system; the second high-reflection mirror (21) corresponds to the acousto-optic Q-switch (13), and the acousto-optic Q-switch (13), the cavity length control system, the energy supply system, the first aspheric lens (12) and the second aspheric lens (23) are all connected with the control system;
seed light emitted by the seed source (1) sequentially passes through the optical fiber amplifier (2), the beam expanding system, the isolation system and the first high-reflection mirror (9) to reach the first light splitting system, the first light splitting system divides a light beam into two beams of seed light, one beam of seed light enters the first aspheric lens (12) as reference light, and the other beam of seed light is emitted into the resonant cavity through the second high-reflection mirror (21); at the moment, the control system controls the acousto-optic Q (13) to be in an on state, seed light enters the energy-increasing system through the acousto-optic Q (13), pumping light emitted by the energy-increasing system is increased to become resonance light, and the resonance light emitted by the energy-increasing system sequentially passes through the cavity length control system and the second light splitting system and then enters the second aspheric lens (23);
when the frequency of the resonant light received by the control system is the same as that of the reference light, the control system closes the acousto-optic Q (13), the resonant light in the second light splitting system is emitted through the acousto-optic Q (13), sequentially passes through the energizing system and the cavity length control system and then passes through the second light splitting system again, and the resonant light oscillates for multiple times in the resonant cavity, so that the resonant light emits target light from an output coupling mirror (18) in the second light splitting system in an energy sufficient state.
2. The dual piezoelectric ceramic annular cavity based seed injection high energy pulse laser of claim 1, wherein: the beam expanding system comprises a plano-concave lens (3) and a plano-convex lens (4), wherein the input end of the plano-concave lens (3) corresponds to the output end of the optical fiber amplifier (2), the output end of the plano-concave lens (3) corresponds to the input end of the plano-convex lens (4), and the output end of the plano-convex lens (4) corresponds to the input end of the isolation system.
3. The dual piezoelectric ceramic annular cavity based seed injection high energy pulse laser of claim 2, wherein: the isolation system comprises a P polaroid (5), an F-P optical rotatory device (6), a half wave plate I (7) and an S polaroid (8) which are sequentially arranged, wherein the input end of the P polaroid (5) corresponds to the output end of the plano-concave lens (3), and the output end of the S polaroid (8) corresponds to the input end of the first high-reflection mirror (9).
4. A dual piezoelectric ceramic ring cavity based seed injection high energy pulse laser as defined in claim 3, wherein: the first light splitting system comprises a half-wave plate II (20) and a first polarization light splitting piece (11) which are sequentially arranged, the input end of the half-wave plate II (20) corresponds to the output end of the first high-reflection mirror (9), the linear output end of the first polarization light splitting piece (11) corresponds to the input end of the second high-reflection mirror (21), and the polarization output end of the first polarization light splitting piece (11) corresponds to the input end of the first aspheric lens (12).
5. The dual piezoelectric ceramic annular cavity based seed injection high energy pulse laser of claim 4, wherein: the energy supply system comprises a pumping source (10), the pumping source (10) is connected with the control system, an optical fiber coupler I (19) is arranged at the output end of the pumping source (10), and the output end of the optical fiber coupler I (19) corresponds to the input end of the energy increasing system.
6. The dual piezoelectric ceramic annular cavity based seed injection high energy pulse laser of claim 5, wherein: the energy-reducing system comprises an antireflection film mirror I (14), a pump end amplifier (15) and an antireflection film mirror II (22) which are sequentially and correspondingly arranged, wherein the input end of the antireflection film mirror I (14) is respectively corresponding to the output end of an optical fiber coupler I (19) and the output end of an acousto-optic Q (13), the output end of the antireflection film mirror II (22) is corresponding to the input end of the cavity length control system, and the optical fiber coupler, the antireflection film mirror I (14), the pump end amplifier (15) and the antireflection film mirror II (22) are all positioned in the same vertical optical path.
7. The dual piezoelectric ceramic annular cavity based seed injection high energy pulse laser of claim 6, wherein: the cavity length control system comprises a first piezoelectric ceramic (16) and a second piezoelectric ceramic (17), wherein the first piezoelectric ceramic (16) and the second piezoelectric ceramic (17) are connected with the control system, the first piezoelectric ceramic (16) and the second piezoelectric ceramic (17) are provided with a third high-reflection mirror (24), the third high-reflection mirror (24) on the first piezoelectric ceramic (16) and the third high-reflection mirror (24) on the second piezoelectric ceramic (17) are arranged in parallel, the input end of the third high-reflection mirror (24) on the first piezoelectric ceramic (16) corresponds to the output end of the antireflection film II (22), the output end of the third high-reflection mirror (24) on the first piezoelectric ceramic (16) corresponds to the input end of the third high-reflection mirror (24) on the second piezoelectric ceramic (17), and the output end of the third high-reflection mirror (24) on the second piezoelectric ceramic (17) corresponds to the input end of the second spectroscopic system.
8. The dual piezoelectric ceramic annular cavity based seed injection high energy pulse laser of claim 7, wherein: the first piezoelectric ceramic (16), the second piezoelectric ceramic (17) and the third high-reflection mirror (24) connected to the first piezoelectric ceramic (16) and the second piezoelectric ceramic (17) are all inclined at 45 degrees.
9. The dual piezoelectric ceramic annular cavity based seed injection high energy pulse laser of claim 7 or 8, wherein: the second light splitting system further comprises a half-wave plate three (25), a fourth high-reflection mirror (26) and a second polarization light splitting sheet (27) which are sequentially arranged, the input end of the half-wave plate three (25) corresponds to the output end of the output coupling mirror (18), the half-wave plate three (25) and the fourth high-reflection mirror (26) are arranged on the same horizontal light path, the output end of the fourth high-reflection mirror (26) corresponds to the input end of the second polarization light splitting sheet (27), the linear output end of the second polarization light splitting sheet (27) corresponds to the acousto-optic Q-switching (13), and the polarization output end of the second polarization light splitting sheet (27) corresponds to the second aspheric lens (23).
10. The dual piezoelectric ceramic annular cavity based seed injection high energy pulse laser of claim 9, wherein: the control system comprises a control module, an acquisition module, a detection module and an optical fiber coupler, wherein the input end of the optical fiber coupler is connected with the second aspheric lens (12) and the second aspheric lens (23), the output end of the optical fiber coupler is connected with the acquisition module, the acquisition module transmits signals to the control module through the detection module, and the control module is further connected with the first piezoelectric ceramic (16), the second piezoelectric ceramic (17), the acousto-optic Q-switch (13) and the pumping source (10) in a control manner.
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