CN217789033U - Mixed pulse laser - Google Patents

Abstract

The utility model discloses a hybrid pulse laser, including the seed source of coupling in proper order, pulse widening unit, multistage optic fibre unit, the multistage solid amplification unit and the compression unit of enlargiing in advance, wherein multistage optic fibre unit of enlargiing in advance includes at least two-stage optic fibre subassembly of enlargiing in advance, and multistage solid amplification unit includes at least two-stage solid amplification unit, and the compression unit includes that the diffraction grating is right. The utility model particularly adopts a multi-stage optical fiber pre-amplifying unit as a pre-amplifying stage, thereby improving the power of the optical fiber stage as much as possible, and reducing the burden of solid amplification while keeping better light beam quality; and furthermore, a multi-stage solid amplification unit is used as a main amplifier, so that the space structure occupied by the solid part is reduced, the heat load in the solid amplification process is reduced, and the difficulty of solid-stage structural design and heat treatment is reduced.

Description

Mixed pulse laser

Technical Field

The utility model relates to the field of laser technology, especially, relate to a hybrid pulse laser.

Background

The femtosecond laser pulse has important application in the fields of ultrafast micro-nano processing, ultrafast nonlinear optics, terahertz generation, time-resolved spectroscopy and the like. The common technical route for generating high-energy femtosecond laser pulses is the chirped pulse amplification technology, and the laser gain medium of the amplification system can be a rare-earth ion-doped quartz optical fiber or a bulk crystal doped with rare-earth ions.

The fiber femtosecond laser is usually all of a fiber structure except for a compression optical path. The overall structure is stable, but the fiber cannot withstand high peak powers at which the pulse quality degrades due to nonlinear effects. The solid femtosecond laser has several schemes such as bulk crystal, slab amplification and disc amplification. The quality of the light beam amplified by the strip is difficult to achieve, the disc amplification technology is only mastered by a few families such as the Tong Kuai company in Germany, and the bulk crystal amplification technology is the most commonly used technology in solid amplification. The solid-state amplifier can achieve very high average power and peak power, but the thermal load and structural stability of the solid-state femtosecond laser are the difficulty of machine implementation.

Therefore, the existing femtosecond laser can not realize the high stability of the device and the emission of high-quality light beams at the same time.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that current pulse laser can't realize device stability height and emittable high quality light beam simultaneously.

In order to solve the technical problem, the utility model provides a hybrid pulse laser, including seed source, pulse stretching unit, the multistage optic fibre unit of preamplifying, multistage solid amplification unit and the compression unit of coupling in proper order, wherein multistage optic fibre unit of preamplifying includes at least two-stage optic fibre subassembly of preamplifying, multistage solid amplification unit includes at least two-stage solid amplification unit, the compression unit includes that the diffraction grating is right.

Preferably, the pulse stretching unit includes a fiber circulator and a chirped fiber grating, a first end of the fiber circulator is coupled to the input end of the seed source, a second end of the fiber circulator is connected to the chirped fiber grating, and a third end of the fiber circulator is connected to the input end of the multistage fiber pre-amplification unit.

Preferably, the multistage optical fiber pre-amplification unit comprises a primary optical fiber pre-amplification component, a secondary optical fiber pre-amplification component and a tertiary optical fiber pre-amplification component which are connected in sequence.

Preferably, the primary optical fiber pre-amplification assembly includes a first pump element, a first beam combiner, a first active optical fiber, a first isolation element, and an acoustic-optical modulator, where a pump input end of the first beam combiner is connected to an output end of the first pump element, a common input end of the first beam combiner is coupled to an output end of the pulse stretching unit, an output end of the first beam combiner is connected to a first end of the first active optical fiber, a second end of the first active optical fiber is connected to a first end of the first isolation element, and a second end of the first isolation element is connected to an optical fiber input end of the acoustic-optical modulator.

Preferably, the secondary optical fiber pre-amplification assembly comprises a second pumping element, a wavelength division multiplexer, a second active optical fiber and a second isolation element, wherein a pumping input end of the wavelength division multiplexer is connected with an output end of the second pumping element, a common input end of the wavelength division multiplexer is connected with an output end of the primary optical fiber pre-amplification assembly, an output end of the wavelength division multiplexer is connected with a first end of the second active optical fiber, and a second end of the second active optical fiber is connected with a first end of the second isolation element.

Preferably, the tertiary optical fiber pre-amplification assembly includes a third pumping element, a second beam combiner and a third active optical fiber, wherein a pumping input end of the second beam combiner is connected to an output end of the third pumping element, a common input end of the second beam combiner is connected to an output end of the secondary optical fiber pre-amplification assembly, and an output end of the second beam combiner is connected to a first end of the third active optical fiber.

Preferably, the multi-stage solid amplifying unit comprises a first-stage solid amplifying component, a second-stage solid amplifying component and a third-stage solid amplifying component which are connected in sequence.

Preferably, the hybrid pulse laser as claimed in claim 7, wherein the primary solid-state amplifying assembly includes a third isolation element, a polarization splitting prism, a fourth pump element, a first laser crystal, a first 45 ° laser high-reflection pump light high lens, a 1/4 wave plate, and a 0 ° laser high mirror, wherein the signal light output by the multistage optical fiber pre-amplifying unit passes through the third isolation element and the polarization splitting prism in sequence, and coaxially enters the first laser crystal, and the pump light emitted by the fourth pump element is transmitted to the first laser crystal through the first 45 ° laser high-reflection pump light high lens, thereby completing the first-stage single-pass amplification; the signal light amplified by the first laser crystal is transmitted to the 0-degree laser high reflection mirror through the first 45-degree laser high reflection pump light high lens and the 1/4 wave plate, the signal light amplified by the first laser crystal is returned to the polarization beam splitter prism by the original path and is reflected by the polarization beam splitter prism, so that the signal light is separated from the initial signal light beam, and the signal light passes through the first laser crystal for the second time in the return path of the original path, so that the double-pass amplification is completed.

Preferably, the secondary solid-state amplification component includes a fifth pump element, a second laser crystal, and a second 45 ° laser high-back pump light high lens, where the signal light output by the primary solid-state amplification component coaxially enters the second laser crystal, the pump light emitted by the fifth pump element is transmitted to the second laser crystal through the second 45 ° laser high-back pump light high lens, and the signal light is amplified in a single pass.

Preferably, the third-stage solid amplifying component and the second-stage solid amplifying component have the same structure.

Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:

the mixed pulse laser provided by the embodiment of the utility model adopts the mixed amplification mode of the optical fiber solid laser, and simultaneously uses the chirped fiber grating as the stretcher; specifically, a multi-stage optical fiber pre-amplification unit is adopted as a pre-amplification stage, so that the power of the optical fiber stage is improved as much as possible, and the burden of solid amplification is reduced while better light beam quality is kept; and a multi-stage solid amplifying unit is further adopted as a main amplifier, so that the space structure occupied by the solid part is reduced, the heat load in the solid amplifying process is reduced, and the difficulty of solid-stage structural design and heat treatment is reduced.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, together with the description of embodiments of the invention, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic diagram illustrating an overall structure of a hybrid pulse laser according to an embodiment of the present invention;

fig. 2 shows a schematic structural diagram of a multi-stage optical fiber pre-amplifying unit according to a first embodiment of the present invention;

fig. 3 shows a schematic structural diagram of a multi-stage solid amplifying unit in the first embodiment of the present invention;

the optical fiber laser amplifier comprises a seed source 1, a pulse stretching unit 2, a multistage optical fiber pre-amplifying unit 3, a multistage solid amplifying unit 4, a compression unit 5, a wavelength division multiplexer 6, a polarization beam splitter prism 7, a 1/4 wave plate 8, a 0-degree laser high-reflection mirror 9, an acoustic-optical modulator 10, first to fifth pumping elements 11 to 15, first to third active optical fibers 21 to 23, first to second beam combiners 31 to 32, first to sixth isolation elements 41 to 46, first to second laser crystals 51 to 52, first to second 45-degree laser high-reflection pump optical high lenses 61 to 62, first to sixth 45-degree laser high-reflection mirrors 71 to 76, first to third half wave plates 81 to 83 and first to tenth wave plates 91 to 910.

Detailed Description

The following detailed description will be made with reference to the accompanying drawings and examples, so as to solve the technical problems by applying technical means to the present invention, and to fully understand and implement the technical effects of the present invention. It should be noted that, as long as no conflict is formed, the embodiments and the features in the embodiments of the present invention may be combined with each other, and the technical solutions formed are all within the scope of the present invention.

The fiber femtosecond laser is generally all of a fiber structure except for a compression optical path. The overall structure is stable, but the fiber cannot withstand high peak powers where the pulse quality degrades due to nonlinear effects. The solid femtosecond laser has several schemes such as bulk crystal, slab amplification and disc amplification. The quality of the light beam amplified by the strip is difficult to achieve, the disc amplification technology is only mastered by a few families such as German Tokuai company, and the bulk crystal amplification technology is the most commonly used technology in solid amplification. The solid-state amplifier can achieve very high average power and peak power, but the thermal load and structural stability of the solid-state femtosecond laser are difficult points of machine completion. Therefore, the existing femtosecond laser can not realize the good improvement of the beam quality.

Example one

For solving the technical problem who exists among the prior art, the embodiment of the utility model provides a mixed pulse laser is provided.

Fig. 1 is a schematic diagram illustrating an overall structure of a hybrid pulse laser according to an embodiment of the present invention; referring to fig. 1, the embodiment of the utility model provides a hybrid pulse laser includes seed source 1, pulse stretching unit 2, multistage optic fibre preamplification unit 3, multistage solid amplification unit 4 and compression unit 5, wherein pulse stretching unit 2's input and seed source 1's output coupling, multistage optic fibre preamplification unit 3's input and pulse stretching unit 2's output coupling, multistage solid amplification unit 4's input and multistage optic fibre preamplification unit 3's output coupling, compression unit 5's input and multistage fixed amplification unit's output coupling.

The mixed pulse laser of the embodiment integrally adopts a chirp amplification technology, the oscillation cavity of the seed source 1 is a femtosecond oscillation cavity, and the output is a pulse with chirp. The pulse stretching unit 2 is mainly used for stretching the pulse output by the seed source 1; the pulse stretching unit 2 specifically comprises an optical fiber circulator and a chirped fiber grating, wherein a first end of the optical fiber circulator is coupled with an input end of the seed source 1, a second end of the optical fiber circulator is connected with the chirped fiber grating, and a third end of the optical fiber circulator is connected with an input end of the multistage optical fiber pre-amplifying unit 3.

The multi-stage fiber pre-amplification unit 3 includes at least two stages of fiber pre-amplification assemblies. Fig. 2 shows a schematic structural diagram of a multi-stage optical fiber pre-amplifying unit according to a first embodiment of the present invention; referring to fig. 2, the multistage optical fiber pre-amplifying unit 3 according to the embodiment of the present invention may include a first-stage optical fiber pre-amplifying module, a second-stage optical fiber pre-amplifying module, and a third-stage optical fiber pre-amplifying module, which are connected in sequence.

The primary optical fiber pre-amplification assembly comprises a first pumping element 11, a first beam combiner 31, a first active optical fiber 21, a first isolation element 41 and an acousto-optic modulator 10, wherein a pumping input end of the first beam combiner 31 is connected with an output end of the first pumping element 11, a common input end of the first beam combiner 31 is coupled with an output end of the pulse widening unit 2, an output end of the first beam combiner 31 is connected with a first end of the first active optical fiber 21, a second end of the first active optical fiber 21 is connected with a first end of the first isolation element 41, and a second end of the first isolation element 41 is connected with an optical fiber input end of the acousto-optic modulator 10. The stage pre-amplification introduces a small nonlinear phase shift and the acousto-optic modulator 10 is mainly used to reduce noise in the output beam.

For example, the signal power of the primary fiber pre-amplifier assembly may be set to a few milliwatts, the amplified output power may be about 500mW, the single pulse energy may be about 16nJ, the peak power after pulse broadening may be about 15W, and the nonlinear coefficient of the 10/125 fiber may be about 1.9 × 10 ^-3 m ^-1 W ^-1 . The frequency is reduced by the acousto-optic modulator 10, the acousto-optic loss is generally 50%, and the single pulse energy is also reduced to about 8 nJ. It should be noted that the parameters of the primary optical fiber pre-amplification module and the components thereof may also be set to other reasonable values, which are not limited too much here.

The second-stage optical fiber amplification design scheme adopts a fiber core pumping amplification mode, namely, the second-stage optical fiber pre-amplification assembly comprises a second pumping element 12, a wavelength division multiplexer 6, a second active optical fiber 22 and a second isolation element 42, wherein a pumping input end of the wavelength division multiplexer 6 is connected with an output end of the second pumping element 12, a public input end of the wavelength division multiplexer 6 is connected with an output end of the first-stage optical fiber pre-amplification assembly, an output end of the wavelength division multiplexer 6 is connected with a first end of the second active optical fiber 22, and a second end of the second active optical fiber 22 is connected with a first end of the second isolation element 42. Wherein the second active fiber 22 is a Yb 6/125 doped single clad polarization maintaining fiber.

For example, the nonlinear coefficient of the 6/125 polarization-maintaining passive optical fiber in the two-stage optical fiber pre-amplification component can be set to be about 5 x 10 ^{- 3} m ^-1 W ^-1 And the peak power comes to about 0.117kW, so the lengths of the passive fibers of the beam combiner used by the isolator and the three-stage amplification need to be controlled. It should be noted that the parameters of the secondary optical fiber pre-amplification module and its components may also be set to other reasonable values, which are not limited too much here.

The three-stage optical fiber pre-amplification assembly comprises a third pumping element 13, a second beam combiner 32 and a third active optical fiber 23, wherein a pumping input end of the second beam combiner 32 is connected with an output end of the third pumping element 13, a common input end of the second beam combiner 32 is connected with an output end of the second-stage optical fiber pre-amplification assembly, an output end of the second beam combiner 32 is connected with a first end of the third active optical fiber 23, and a second end of the third active optical fiber 23 is used as an output of the multi-stage optical fiber pre-amplification unit 3. The three-stage optical fiber pre-amplification component is a main amplifier, and the generated nonlinear effect is the most. Therefore, in order to reduce the non-linear effects generated during the amplification process: on the one hand, the length of the gain fiber needs to be shortened at the expense of the efficiency of the amplifier, and the absorption coefficient of a normal amplifier for a pump with the wavelength of 976nm is 15-18db. On the other hand, an optical fiber with a large mode field area is needed to reduce the nonlinear effect in the amplifier, the third active optical fiber 23 of this embodiment adopts a multimode optical fiber, the mode is unstable due to stress and other factors, and in order to maintain the directivity of the light spot and the stability of the mode in the input solid amplification, the second combiner 32 of this embodiment adopts a 10/125 combiner to combine the signal and the pump.

For example, the third-stage optical fiber pre-amplification assembly can be set to amplify to about 500mW, the pump light entering the optical fiber is about 5-8 w, the heat dissipation of the optical fiber needs to be considered, and the heat dissipation of the optical fiber can be attached to a heat dissipation plate. The optical fiber three-stage amplifier uses double-clad optical fiber, the mode field diameter and the numerical aperture of the optical fiber are calculated to obtain the optical fiber which is not a single-mode optical fiber, and the optical fiber needs to be coiled to a certain degree, so that the multimode mode loss is relatively high, the fundamental mode loss is low, and good light beam quality is obtained. It should be noted that the parameters of the three-stage fiber pre-amplification module and the components thereof may also be set to other reasonable values, which are not limited too much here.

The multi-stage solid amplifying unit 4 comprises at least two stages of solid amplifying groups, and fig. 3 shows a schematic structural diagram of the multi-stage solid amplifying unit in the first embodiment of the present invention (the three-stage solid amplifying component is not shown); referring to fig. 3, the multi-stage solid amplifying unit 4 in the embodiment of the present invention may include a first-stage solid amplifying component, a second-stage solid amplifying component, and a third-stage solid amplifying component connected in sequence. The multistage solid amplification unit 4 adopts an end-pumped traveling wave amplification mode, the signal light of the first-stage solid amplification component is weaker, and a bi-pass or multi-pass structure is usually used for improving the energy extraction efficiency. The signal light power of the second-stage solid amplification component and the signal light power of the third-stage solid amplification component are both in the magnitude of more than 10 watts, and only single traveling wave amplification is needed.

The primary solid amplifying assembly adopts a design of a double-pass amplifier, and specifically comprises a third isolating element 43, a fourth isolating element 44, a polarization splitting prism 7, a fourth pumping element 14, a first laser crystal 51, a first 45-degree laser high-reflection pumping lens 61, a 1/4 wave plate 8, a 0-degree laser high-reflection mirror 9 and a plurality of light path adjusting elements. After signal light output by the multistage optical fiber pre-amplification unit 3 sequentially passes through the first lens 91, the first quarter wave plate 81, the third isolation element 43, the second lens 92 and the fifth isolation element 44, the signal light is reflected by the first 45-degree laser high reflector 71, passes through the polarization splitting prism 7, is reflected by the second 45-degree laser high reflector 72, coaxially enters the first laser crystal 51, and pump light emitted by the fourth pump element 14 sequentially passes through the fourth lens 94, the fifth lens 95 and the first 45-degree laser high reverse pump light high lens 61 and is transmitted to the first laser crystal 51, so that first-stage one-way amplification is completed; the light amplified by the first laser crystal 51 is reflected by the first 45-degree laser high-back pump light high lens 61 and the third 45-degree laser high reflector 73, and then is transmitted to the 0-degree laser high reflector 9 through the 1/4 wave plate 8 and the third lens 93 in sequence, because the signal light passes through the 1/4 wave plate 8 twice, the polarization direction rotates 90 degrees relative to the original light, the light amplified by the first laser crystal 51 is returned to the polarization beam splitter prism 7 by the original path and is reflected by the polarization beam splitter prism 7, so that the signal light is separated from the original signal light beam, and in the original path, the signal light passes through the first laser crystal 51 for the second time, and the double-pass amplification is completed. The signal light after the double-pass amplification passes through the sixth lens 96, is reflected by the fourth 45-degree laser high-reflection mirror 74, sequentially passes through the second half-wave plate 82 and the fourth isolation unit 44, and is transmitted to the secondary solid amplification assembly.

The secondary solid amplifying assembly is designed by a single-pass amplifier, and specifically comprises a fifth pumping element 15, a second laser crystal 52, a second 45-degree laser high-back pumping optical lens 62 and a plurality of optical path adjusting elements, wherein signal light output by the primary solid amplifying assembly is reflected by a fifth 45-degree laser high-reflection mirror 75 and coaxially enters the second laser crystal 52, the pumping light emitted by the fifth pumping element 15 is sequentially transmitted to the second laser crystal 52 through a seventh lens 97, an eighth lens 98 and the second 45-degree laser high-back pumping optical lens 62, and the signal light completes single-pass amplification. The signal light after single-pass amplification is reflected by the sixth 45 ° laser high-reflection mirror 76 and passes through the ninth lens 99, the tenth lens 910, the third half-wave plate 83, and the sixth isolation element 46 in sequence. The third-stage solid pre-amplifying assembly has the same structure as the second-stage solid pre-amplifying assembly, and the structure thereof is not described herein again. Nor is it shown in fig. 3.

Preferably, all of the above laser crystals are ytterbium-doped yttrium aluminum garnet crystals. And for the arrangement of the solid amplifying component, attention needs to be paid to the matching of the signal light and the pump light and the processing of the crystal thermal effect to improve the roundness of the light spot and the quality of the light beam.

The compression unit 5 includes a diffraction grating pair. The distance between the grating pairs is controlled using a motor to adjust the output pulse width. Therefore, the transmission type grating is adopted, so that the grating pair works at a Littrow angle, and the diffraction and compression efficiency is improved. And through the design to the light path, can only use a grating to compress, reduce cost.

It should be noted that the pulse width output by the seed source 1 is ps magnitude, and is broadened to ns magnitude by the pulse broadening unit 2, amplified by the multistage optical fiber pre-amplifying unit 3 and the multistage solid amplifying unit 4, and finally compressed back to femtosecond magnitude by the diffraction grating of the compression unit 5 to be finally output.

It is to be understood that the "coupling" described in this embodiment may be coupled by means of optical fiber connection, may also be coupled by using free space coupling or using other optical devices, may also be directly connected or disconnected, and may be designed according to practical situations in specific implementations. In other embodiments, the number of the optical fiber amplifying units and the solid amplifying units is not limited to one, and the multi-stage amplifying structure can be designed according to actual situations.

Although the embodiments of the present invention have been disclosed, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be apparent to persons skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. The utility model provides a hybrid pulse laser which characterized in that, includes seed source, pulse stretching unit, multistage optic fibre preamplification unit, multistage solid amplification unit and the compression unit of coupling in proper order, wherein multistage optic fibre preamplification unit includes at least two-stage optic fibre preamplification subassembly, multistage solid amplification unit includes at least two-stage solid amplification subassembly, the compression unit includes the diffraction grating pair.

2. The hybrid pulse laser as claimed in claim 1, wherein the pulse stretching unit comprises a fiber circulator and a chirped fiber grating, a first end of the fiber circulator is coupled to an input end of the seed source, a second end of the fiber circulator is connected to the chirped fiber grating, and a third end of the fiber circulator is connected to an input end of the multi-stage fiber pre-amplifying unit.

3. The hybrid pulse laser of claim 1, wherein the multi-stage fiber pre-amplification unit comprises a primary fiber pre-amplification assembly, a secondary fiber pre-amplification assembly and a tertiary fiber pre-amplification assembly, which are connected in sequence.

4. The hybrid pulsed laser of claim 3, wherein the primary fiber pre-amplification assembly comprises a first pump element, a first beam combiner, a first active fiber, a first isolation element, and an acousto-optic modulator, wherein a pump input of the first beam combiner is connected to an output of the first pump element, a common input of the first beam combiner is coupled to an output of the pulse stretching unit, an output of the first beam combiner is connected to a first end of the first active fiber, a second end of the first active fiber is connected to a first end of the first isolation element, and a second end of the first isolation element is connected to a fiber input of the acousto-optic modulator.

5. The hybrid pulsed laser of claim 3, wherein the secondary fiber pre-amplification assembly comprises a second pump element, a wavelength division multiplexer, a second active fiber, and a second isolation element, wherein a pump input of the wavelength division multiplexer is connected to an output of the second pump element, a common input of the wavelength division multiplexer is connected to an output of the primary fiber pre-amplification assembly, an output of the wavelength division multiplexer is connected to a first end of the second active fiber, and a second end of the second active fiber is connected to a first end of the second isolation element.

6. The hybrid pulsed laser of claim 3, wherein the tertiary fiber pre-amplification assembly comprises a third pump element, a second combiner and a third active fiber, wherein the pump input of the second combiner is connected to the output of the third pump element, the common input of the second combiner is connected to the output of the secondary fiber pre-amplification assembly, and the output of the second combiner is connected to the first end of the third active fiber.

7. The hybrid pulsed laser of claim 1, wherein said multi-stage solid-state amplification unit comprises a primary solid-state amplification component, a secondary solid-state amplification component and a tertiary solid-state amplification component connected in series.

8. The hybrid pulse laser as claimed in claim 7, wherein the primary solid-state amplifying assembly includes a third isolation element, a polarization splitting prism, a fourth pumping element, a first laser crystal, a first 45 ° laser high-reflectivity pump high lens, a 1/4 wave plate and a 0 ° laser high reflector, wherein the signal light output from the multistage fiber pre-amplifying unit passes through the third isolation element and the polarization splitting prism in sequence and coaxially enters the first laser crystal, and the pump light emitted from the fourth pumping element passes through the first 45 ° laser high-reflectivity pump high lens and is transmitted to the first laser crystal to complete the first-stage single-pass amplification; the signal light amplified by the first laser crystal is transmitted to the 0-degree laser high-reflection mirror through the first 45-degree laser high-reflection pump light high lens and the 1/4 wave plate, the signal light amplified by the first laser crystal returns to the polarization beam splitter prism by an original path and is reflected by the polarization beam splitter prism, so that the signal light is separated from the original signal light beam, the signal light passes through the first laser crystal in the original path returning light path for the second time, and double-pass amplification is completed.

9. The hybrid pulsed laser of claim 7, wherein the secondary solid state amplifier module comprises a fifth pump element, a second laser crystal and a second 45 ° laser high-back pump optical lens, wherein the signal light output from the primary solid state amplifier module coaxially enters the second laser crystal, the pump light emitted from the fifth pump element is transmitted to the second laser crystal through the second 45 ° laser high-back pump optical lens, and the signal light is amplified in a single pass.

10. The hybrid pulsed laser of claim 9, wherein the tertiary solid state amplification component is structurally identical to the secondary solid state amplification component.

Images