A high-energy, ultrashort, pure quaternary soliton fiber laser system based on pulse shaping

Abstract

This invention relates to a high-energy, ultrashort, pure fourth-order soliton fiber laser system based on pulse shaping, belonging to the field of optoelectronic equipment technology. Its structure includes: the output of a seed pulse source (1) connected to the input of a power adjustment module (2); the output of the power adjustment module (2) connected to the input of a polarization pulse segmentation module (3); the output of the polarization pulse segmentation module (3) connected to the input of a polarization pulse synthesis module (4); and the output of the polarization pulse synthesis module (4) connected to the input of a spectral shaping module (5). This invention utilizes a liquid crystal spatial light modulator to design a programmable pulse shaping structure for high-order dispersion management within the fiber laser cavity, achieving pure fourth-order soliton pulse output, which has advantages such as high pulse energy and narrow pulse width.

Description

Technical Field

[0001] This invention belongs to the field of optoelectronic equipment technology, and specifically relates to a high-energy ultrashort pure quaternary soliton fiber laser system based on pulse shaping. Background Technology

[0002] High-energy ultrashort pulses have important applications in nonlinear optics, laser processing, strong-field physics, laser ablation, and laser materials processing. Injecting picosecond or femtosecond pulses into highly nonlinear optical fibers allows for the realization of supercontinuum output through rich nonlinear processes such as Raman scattering, soliton splitting, dispersive wave generation, and four-wave mixing. Optical frequency combs generated by high-energy ultrashort pulses can be used for precise optical frequency measurement. High-energy fiber lasers have become a hot research area in laser technology. Developing ultrashort pulse fiber lasers with even higher energy and narrower pulse widths is a cutting-edge research topic in laser technology and a major driving force in the current global laser application market.

[0003] Traditional soliton pulse energies are typically less than 0.1 nJ, but dispersion management techniques can increase them by an order of magnitude. Self-similar fiber lasers and dissipative soliton fiber lasers can achieve pulse energies of tens of nJ, while Mamyshev fiber oscillators can reach pulse energies as high as 50 nJ. However, the generation of these solitons is a result of the balance between second-order dispersion and nonlinear effects, and the pulse energy is proportional to the negative first power of the pulse width, i.e., the soliton area theory, which limits the improvement of soliton energy. Pure fourth-order solitons, generated by the balance between negative fourth-order dispersion and nonlinear effects, have pulse energies proportional to the negative third power of the pulse width. This means that a narrower pulse width will significantly increase the pulse energy, and this energy-pulse width extension characteristic demonstrates the enormous potential of pure fourth-order solitons in generating high-energy ultrashort pulses. However, research on higher-order dispersion effects in fiber lasers is scarce both domestically and internationally, and the values ​​of higher-order dispersion are often too small to be considered perturbations and are therefore ignored. Realizing higher-order dispersion management in fiber laser cavities and constructing high-energy femtosecond pure fourth-order soliton fiber lasers is urgently needed.

[0004] However, due to chirp caused by dispersion and nonlinear effects, fiber lasers require pulse width compression to generate femtosecond-level pulses. Common pulse width compression methods include dispersion-compensating fibers, photonic crystal bandgap fibers, and grating pairs. Dispersion-compensating fibers introduce power-related nonlinear effects, which are detrimental to the generation of high-power ultrashort pulses. Provided the splicing problem is solved, using photonic crystal bandgap fibers to compress pulse width can achieve an all-fiber system while effectively avoiding the influence of nonlinear effects. However, photonic crystal bandgap fibers are very expensive and difficult to splice with single-mode fibers.

[0005] In summary, current fiber laser systems for obtaining high-energy femtosecond soliton pulses have inherent drawbacks and require further improvement. Summary of the Invention

[0006] To overcome the limitations of traditional systems in generating ultrashort pulses, which are restricted by soliton area theory and have insufficient energy and pulse width, this invention provides a high-energy ultrashort pure fourth soliton fiber laser system based on pulse shaping. The high-energy pure fourth soliton pulse obtained through the seed pulse source module is used to obtain ultrashort pulses through the spectral shaping module, thereby obtaining high-energy ultrashort pulses.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A high-energy ultrashort pure fourth soliton fiber laser system based on pulse shaping has the following structure: the output end of seed pulse source 1 is connected to the input end of power adjustment module 2, the output end of power adjustment module 2 is connected to the input end of polarization pulse segmentation module 3, the output end of polarization pulse segmentation module 3 is connected to the input end of polarization pulse synthesis module 4, and the output end of polarization pulse synthesis module 4 is connected to the input end of spectral shaping module 5.

[0009] The seed pulse source 1 is structured such that the pump source 101 is connected to the 980nm end of the wavelength division multiplexer 102, and the 1550nm end of the wavelength division multiplexer 102 is connected to the input end of the first collimator 104 through the first erbium-doped fiber 103. The optical pulse passes through the first collimator 104, the first quarter-wave plate 105, the first half-wave plate 106, the first polarization beam splitter 107, the first isolator 108, the second quarter-wave plate 109, and the second collimator 1. 10. After the third collimator 111, the light pulse is incident on the first reflecting mirror 112. The first reflecting mirror 112 reflects the light pulse onto the first grating 113. The light pulse output from the first grating 113 passes through the first convex lens 114, the first spatial light modulator 115, and the second convex lens 116, and is then transmitted to the second grating 117. The second grating 117 reflects the light pulse to the second reflecting mirror 118, and then to the fourth collimator 119. The second collimator 119 is connected to the input of the first polarizer 120. The output of the first polarizer 120 is connected to the input of the first polarization controller 121 through a polarization-maintaining fiber. The output of the first polarization controller 121 is connected to the input of the second polarization controller 122 through a polarization-maintaining fiber. The output of the second polarization controller 122 is connected to the input of the second polarizer 123 through a polarization-maintaining fiber. The output of the second polarizer 122 is connected to the common terminal of the wavelength division multiplexer 102. The optical pulse is output from the output end of the first polarizing beam splitter 107, which is perpendicular to the incident direction.

[0010] The power adjustment module 2 has the following optical path structure: A light pulse is transmitted from the third reflector 201 to the third grating 202. The third grating 202 transmits the light pulse to the fourth reflector 203, which then reflects it to the fifth reflector 204. The fifth reflector 204 reflects the light pulse back to the third grating 202. The pulse output from the third grating 202 is transmitted from the third convex lens 205 to the sixth reflector 206, and then reflected back to the third grating 202 by the third convex lens 205. The light pulse is then transmitted from the third grating 202 to the fourth reflector 203. The fourth reflector 203 reflects the light pulse, which is then reflected by the fifth reflector 204 and incident on the third grating 202. The light pulse output from the third grating 202 is incident on the Pollo prism 207 and reflected back to the third grating 202. After passing through the third grating 202, the light pulse again passes through the fourth reflector 203 along the route described above. The fifth reflector 204, the third grating 202, the third convex lens 205, and the sixth reflector 206 reflect the light pulse multiple times back to the third grating 202. The third grating 202 directs the light pulse to the fourth convex lens 208. The light pulse then passes through the fourth convex lens 208, the acousto-optic modulator 209, the fifth convex lens 210, the second isolator 211, and the second half-wave plate 212 before being directed to the seventh reflector 213. The light pulse is reflected by the seventh reflector 213 to the eighth reflector 214 and then to the sixth convex lens 215. The light pulse passes through the sixth convex lens 215, the fifth collimator 216, the second erbium-doped fiber 217, the sixth collimator 218, and the seventh convex lens 219 before being directed to the ninth reflector 220. The pump light generated by the first photodiode 223 passes through the seventh collimator 222 and the eighth convex lens 221 and then merges with the light pulse previously directed to the ninth reflector 220. The fused light pulse is reflected by the ninth mirror 220 to the tenth mirror 224. The tenth mirror 224 reflects the light pulse to the third half-wave plate 225. The light pulse passes through the third half-wave plate 225, the third quarter-wave plate 226, the bandpass filter 227, and the fourth half-wave plate 228 before being incident on the fourth grating 232. The light pulse is transmitted through the fourth grating 232 to the fifth grating 233, which then transmits it to the eleventh mirror 234. The eleventh mirror 234 reflects the pulse back to the fifth grating 233, which then transmits it to the fourth grating 232. The light pulse output from the fourth grating 232 is transmitted to the twelfth mirror 229 and reflected by it to the fifth half-wave plate 230. Finally, it is output after passing through the second polarization beam splitter 231.

[0011] The polarization pulse splitting module has the following optical path structure: the light pulse is incident on the input end of the third polarization beam splitter 302 via the sixth half-wave plate 301; the light pulse is transmitted from the output end of the third polarization beam splitter 302 perpendicular to the incident direction through the fourth quarter-wave plate 303 to the thirteenth reflector 304; the thirteenth reflector 304 reflects the light pulse back to the fourth quarter-wave plate 303; the fourth quarter-wave plate 303 transmits the light pulse back to the third polarization beam splitter 302; simultaneously, the light pulse is output from another output end of the third polarization beam splitter 302 perpendicular to the incident direction, and after passing through the fifth quarter-wave plate 305, it is transmitted to the fourteenth reflector 306 and the first piezoelectric actuator 307. The light pulse is reflected by the fourteenth mirror 306 back to the fifth quarter-wave plate 305. The fifth quarter-wave plate 305 then transmits the light pulse back to the third polarization beam splitter 302. The light pulse is output from the port of the third polarization beam splitter 302 parallel to the incident direction and transmitted through the seventh half-wave plate 308 to the fourth polarization beam splitter 309. The light pulse is then transmitted from the port of the fourth polarization beam splitter 309 perpendicular to the incident direction through the sixth quarter-wave plate 310 to the fifteenth mirror 311. The fifteenth mirror 311 reflects the light pulse back to the sixth quarter-wave plate 310, which then transmits the light pulse back to the fourth polarization beam splitter 309. Simultaneously, the light pulse is transmitted from the fourth polarization beam splitter... The light pulse from the port of beam splitter 309, perpendicular to the incident direction, is transmitted through the seventh quarter-wave plate 312 to the sixteenth mirror 313 and the second piezoelectric driver 314. The light pulse is then reflected back to the seventh quarter-wave plate 312 by the fifteenth mirror 313. The seventh quarter-wave plate 312 then transmits the light pulse to the fourth polarization beam splitter 309. The light pulse is output from the output end of the fourth polarization beam splitter 309, parallel to the incident direction, and passes through the ninth convex lens 315 and the tenth convex lens 316 before being incident on the tilted chirped Bragg grating 324. The long-wavelength component of the light pulse is transmitted from the back of the tilted chirped Bragg grating 324 to the seventeenth mirror 322, and after reflection by the seventeenth mirror 322... The light pulse is transmitted to the second spatial light modulator 323 and incident from the second spatial light modulator 323 to the seventeenth reflector 322. The seventeenth reflector 322 reflects the light pulse back to the tilted chirped Bragg grating 324. The light pulse is fused with the short-wave component that was previously incident on the tilted chirped Bragg grating 324 and reflected from its front surface. The light pulse is transmitted through the eighth half-wave plate 320 to the first thin-film polarizer 319. The light pulse is split into a main light pulse and a rejection light pulse by the first thin-film polarizer 319. The rejection light pulse is transmitted through the first thin-film polarizer 319 to the beam cutoff 318. The main light pulse is reflected by the first thin-film polarizer 319 to the wedge beam splitter 325 and then output by the wedge beam splitter 325.

[0012] The polarization pulse combining module has the following optical path structure: a light pulse is incident on the input end of the first beam splitter 4001, and transmitted from the output end of the first beam splitter 4001 to the eighteenth reflector 4002. The light pulse is reflected by the eighteenth reflector 4002 to the nineteenth reflector 4003, and then reflected by the nineteenth reflector 4003 to the twentieth reflector 4004. The twentieth reflector 4004 reflects the light pulse to the twenty-first reflector 4005. The light pulse is reflected by the twenty-first reflector 4005 to the eleventh convex lens 4006. After passing through the eleventh convex lens 4006, the twelfth convex lens 4007, and the first dichroic mirror 4008, the light pulse is transmitted and output through the first dichroic mirror 4008. The light pulse is then reflected by the fifty-fifth reflector 4105 to... The light pulses reflected from the first dichroic mirror 4008 are fused, and the fused light pulses are transmitted through the first dichroic mirror 4008 to the first KTiAsO4 crystal 4009. The light pulses are then transmitted through the first KTiAsO4 crystal 4009 to the second dichroic mirror 4010. The short-wavelength light pulses reflected from the second dichroic mirror 4010 are transmitted to the twenty-second reflector 4101, and the long-wavelength light pulses transmitted from the second dichroic mirror 4010 are transmitted to the third dichroic mirror 4011. The light pulses reflected from the third dichroic mirror 4011 are transmitted to the twenty-third reflector 4102, and the light pulses transmitted from the third dichroic mirror 4011 are incident on the twenty-fourth reflector 4012. The light pulses are reflected by the twenty-fourth reflector 4012 to the twenty-fifth reflector 4013, and then... The light pulse is reflected by the fifteenth reflector 4013 to the thirteenth convex lens 4014, then transmitted to the fourteenth convex lens 4015, and finally incident on the twenty-sixth reflector 4016. The light pulse is reflected by the twenty-sixth reflector 4016 to the twenty-seventh reflector 4017, then to the twenty-eighth reflector 4018, then to the twenty-ninth reflector 4019, and finally transmitted to the fourth dichroic mirror 4020. The light pulse is then transmitted to the second KTiAsO4 crystal 4021, and finally to the fifth dichroic mirror 4022. The light pulse reflected by the color mirror 4022 is transmitted to the thirtieth reflecting mirror 4103. The light pulse transmitted from the fifth dichroic mirror 4022 is transmitted to the sixth dichroic mirror 4023. The light pulse reflected by the sixth dichroic mirror 4023 is transmitted to the thirty-first reflecting mirror 4104. The light pulse transmitted from the sixth dichroic mirror 4023 is incident on the fifteenth convex lens 4024. After passing through the fifteenth convex lens 4024, it is transmitted to the sixteenth convex lens 4025. After passing through the sixteenth convex lens 4025, it is incident on the sixth grating 4027. The sixth grating 4027 reflects the light pulse to the seventh grating 4028. The seventh grating 4028 reflects the light pulse to the first roof mirror 4029. After reaching the first roof mirror 4029, the light pulse is reflected back to the sixth grating 4027 along the input path.The sixth grating 4027 transmits the light pulse to the thirty-second reflector 4026. The light pulse is reflected by the thirty-second reflector 4026 to the thirty-third reflector 4030, then to the thirty-fourth reflector 4031, then to the thirty-fifth reflector 4032, then to the thirty-sixth reflector 4033, and finally to the knife-edge prism 4084. From the other output of the first beam splitter 4001, the light pulse is transmitted to the thirty-seventh reflector 4034. The light pulse is reflected by the thirty-seventh reflector 4034 to the thirty-eighth reflector 4035, and then to the thirty-ninth reflector 4036. 6. The light pulse is reflected by the 39th reflector 4036 to the 40th reflector 4037, then by the 40th reflector 4037 to the 41st reflector 4038. The light pulse is then reflected by the 41st reflector 4038 to the 17th convex lens 4039. After passing through the 17th convex lens 4039 and the 18th convex lens 4040, the light pulse is reflected by the 18th convex lens 4040 to the 7th dichroic mirror 4041. After being transmitted through the 7th dichroic mirror 4041, the light pulse merges with the light pulse reflected from the 58th reflector 4106 after being incident on the 7th dichroic mirror 4041. The merged light pulse is then incident on the 7th dichroic mirror 4041 to the 3rd KTiAsO4 crystal 4042. The light pulse is then transmitted through the 3rd KTiAsO4 crystal 4042 to the 8th dichroic mirror. The light pulse reflected from the eighth dichroic mirror 4043 is reflected to the forty-second mirror 4044. The light pulse transmitted from the eighth dichroic mirror 4043 is transmitted to the ninth dichroic mirror 4045. The light pulse reflected by the ninth dichroic mirror 4045 is transmitted to the forty-third mirror 4046. The light pulse output from the ninth dichroic mirror 4045 is incident on the forty-third mirror 4046. The light pulse transmitted by the ninth dichroic mirror 4045 is incident on the forty-fourth mirror 4047. The light pulse reflected by the forty-fourth mirror 4047 is incident on the forty-fifth mirror 4048. The light pulse reflected by the forty-fifth mirror 4048 is incident on the nineteenth convex lens 4049. After passing through the nineteenth convex lens 4049 and the twentieth convex lens 4050, the light pulse is incident on the forty-sixth mirror. 4051. The light pulse is reflected by the forty-sixth mirror 4051 to the forty-seventh mirror 4052, then by the forty-seventh mirror 4052 to the forty-eighth mirror 4053, then by the forty-eighth mirror 4053 to the forty-nineth mirror 4054, and finally by the forty-ninth mirror 4054 to the tenth dichroic mirror 4055. The light pulse is then transmitted through the tenth dichroic mirror 4055 and output. This light pulse merges with the light pulse reflected by the fifty-ninth mirror 4083 to the tenth dichroic mirror 4055 and then incident on the fourth KTiAsO4 crystal 4055. The light pulse is then transmitted through the fourth KTiAsO4 crystal 4056 to the eleventh dichroic mirror 4057, and the light pulse reflected from the eleventh dichroic mirror 4057 is transmitted to the fiftieth mirror 4058.The light pulse transmitted from the eleventh dichroic mirror 4057 is transmitted to the twelfth dichroic mirror 4059. The light pulse reflected by the twelfth dichroic mirror 4059 is transmitted to the fifty-first reflecting mirror 4060. The light pulse transmitted from the twelfth dichroic mirror 4059 is incident on the twenty-first convex lens 4061, and then transmitted to the twenty-second convex lens 4062. The light pulse is then incident on the eighth grating 4063, which reflects it to the ninth grating 4064. The ninth grating 4064 reflects the light pulse to the second roof mirror 4065. After reaching the second roof mirror 4066, the light pulse is reflected back to the eighth grating 4063 along the input path. 3. The light pulse is transmitted to the 52nd reflector 4066, reflected by the 52nd reflector 4066 to the 53rd reflector 4067, then reflected by the 53rd reflector 4067 to the 54th reflector 4068, and then reflected by the 54th reflector 4068 to the knife-edge prism 4084. The light pulse pumped by the laser 4069 is transmitted to the 13th dichroic mirror 4070. The light pulse reflected from the 13th dichroic mirror 4070 passes through the 9th half-wave plate 4071 and is incident on the second thin-film polarizer 4072. The parallel polarized light pulse transmitted through the second thin-film polarizer 4072 is incident on the 55th reflector 4105, and then reflected by the 55th reflector 4105 to the first dichroic mirror 4068. After 08, the vertically polarized light pulse reflected by the second thin-film polarizer 4072 is incident on the third thin-film polarizer 4073. After being reflected by the third thin-film polarizer 4072, the light pulse is transmitted through the tenth half-wave plate 4074 and the third erbium-doped fiber 4075 to the fifty-sixth reflector 4076. The light pulse is reflected by the fifty-sixth reflector 4076 to the fourth dichroic mirror 4020. The light pulse reflected by the fourth dichroic mirror 4020 merges with the light pulse that was incident on the fourth dichroic mirror 4020 through the twenty-ninth reflector 4019 and then transmitted out through the fourth dichroic mirror 4020. The merged light pulse is incident on the second KTiAsO4 crystal 4021. The light pulse output from the thirteenth dichroic mirror 4070 is then transmitted through the fifty-seventh reflector 4076 to the fifth dichroic mirror 4020. The light pulse is transmitted from mirror 4077 to the eleventh half-wave plate 4078. The light pulse, after passing through the eleventh half-wave plate 4078, is incident on the fourth thin-film polarizer 4079. The parallel-polarized light pulse transmitted through the fourth thin-film polarizer 4079 is incident on the fifty-eighth mirror 4106. The light pulse is reflected by the fifty-eighth mirror 4106 to the seventh dichroic mirror 4041. The vertically polarized light pulse, reflected by the fourth thin-film polarizer 4079, is incident on the fifth thin-film polarizer 4080. After being reflected by the fifth thin-film polarizer 4080, the light pulse passes through the twelfth half-wave plate 4081 and the fourth erbium-doped fiber 4082 to the fifty-ninth mirror 4083. The light pulse is reflected by the fifty-ninth mirror 4083 to the tenth dichroic mirror 4055.Finally, two light pulses with the same energy and pulse duration, incident on the knife-edge prism 4084, are transmitted to the sixtieth reflecting mirror 4085. The light pulses are then reflected by the sixtieth reflecting mirror 4085 to the sixty-first reflecting mirror 4086, and finally to the CaF2 lens 4087. The two light pulses are merged by the CaF2 lens 4087, and the merged light pulse is incident on the fifth polarization beam splitter 4088. The light pulse is output from the output end of the fifth polarization beam splitter 4088 perpendicular to the incident direction. The light pulse is reflected by the sixty-second reflecting mirror 4089 to the sixty-third reflecting mirror 4090, then to the sixty-fourth reflecting mirror 4091, then to the sixty-fifth reflecting mirror 4092, and finally back to the fifth polarization beam splitter 4088. After passing through the fifth polarization beam splitter 4088 parallel to the incident direction... The light pulse is output from the output end of the beam splitter. After being output by the fifth polarization beam splitter 4088, it is transmitted through the thirteenth half-wave plate 4093 to the sixth polarization beam splitter 4094. The light pulse is then transmitted along the output end of the sixth polarization beam splitter 4094 perpendicular to the incident direction to the sixty-sixth reflector 495. The light pulse is reflected by the sixty-sixth reflector 495 to the sixty-seventh reflector 4096, then to the sixty-eighth reflector 4097, then to the sixty-ninth reflector 4098, and finally back to the sixth polarization beam splitter 4094. The light pulse is then output from another output end parallel to the incident direction of the sixth polarization beam splitter 4094. The light pulse is then transmitted through the sixth polarization beam splitter to the fourteenth half-wave plate 499, then to the seventh polarization beam splitter 4100, and finally output from the seventh polarization beam splitter 4100.

[0013] The spectral shaping module 5 has the following optical path structure: a light pulse is incident on a third beam splitter 502 after passing through a second beam splitter 501. The light pulse is then transmitted to the 70th reflector 503 via the output of the third beam splitter 502. After being reflected by the 70th reflector 503, the light pulse is reflected sequentially by the 71st reflector 504, the 72nd reflector 505, and the 73rd reflector 506. The light pulse reflected by the 73rd reflector 506 is incident on the 10th grating 512. The 10th grating 512 reflects the light pulse to the 11th grating 513. The 11th grating 513 reflects the light pulse to the 74th reflector 514. After reaching the 74th reflector 514, the light pulse is reflected back to the 10th grating 512 along the input path. The 10th grating 512 then... The light pulse is transmitted to the seventy-fifth reflector 515, reflected by the seventy-fifth reflector 515 to the seventy-sixth reflector 517, and then incident on the twenty-third convex lens 535. The light pulse output from the other output end of the third beam splitter 502 is transmitted to the seventy-seventh reflector 507. After being reflected by the seventy-seventh reflector 507, the light pulse passes sequentially through the seventy-eighth reflector 508, the seventy-ninth reflector 509, the eightieth reflector 510, and the eighty-first reflector 511. The light pulse reflected by the eighty-first reflector 511 and the light pulse reflected by the seventieth reflector 506 enter the tenth grating 512 in parallel, and then follow the incident path of the light pulse incident from the fortieth reflector 506 to the tenth grating 512 as described above. After passing through the tenth grating 512, the eleventh grating 513, and the seventy-fourth reflector 514, the light pulse returns to the tenth grating 512 along the input path. The light pulse is then transmitted from the tenth grating 512 to the seventy-fifth reflector 515, reflected by the seventy-fifth reflector 515 to the seventy-ninth reflector 516, and incident on the twenty-third convex lens 535 via the seventy-ninth reflector 516. The light pulse output from the other output end of the second beam splitter 501 is transmitted to the eightieth reflector 518, and then to the fourth beam splitter 519. The light pulse output from the fourth beam splitter 519 is transmitted to the eighty-first reflector 520, and after being reflected by the eighty-first reflector 520, it sequentially passes through the eighty-second reflector 521, the... The light pulse is reflected by the 83rd reflector 522 and the 84th reflector 523. The light pulse reflected by the 84th reflector 523 is incident on the 12th grating 529. The 12th grating 529 reflects the light pulse to the 13th grating 530. The 13th grating 530 reflects the light pulse to the 85th reflector 531. After reaching the 85th reflector 531, the light pulse is reflected back to the 12th grating 529 along the input path. The 12th grating 529 transmits the light pulse to the 86th reflector 532. The light pulse is reflected by the 86th reflector 532 to the 87th reflector 534. The light pulse is incident on the 23rd convex lens 535. The light pulse output from the other output end of the fourth beam splitter 519 is transmitted to the 88th reflector 524.After being reflected by the 88th reflector 524, the light pulse passes sequentially through the 89th reflector 525, the 90th reflector 526, the 91st reflector 527, and the 92nd reflector 528. The light pulse reflected by the 92nd reflector 528 enters the 12th grating 529 in parallel with the light pulse reflected by the 84th reflector 523. As described above, the incident path of the light pulse from the 84th reflector 523 to the 12th grating 529 passes sequentially through the 12th grating 529, the 13th grating 530, and the 85th reflector 531, and returns to the 12th grating 529 along the input path. The light pulse is then transmitted from the 12th grating 529 to the 86th reflector 532, and reflected by the 86th reflector 532 to the 93rd reflector 528. 33. Four light pulses, incident on the twenty-third convex lens 535 via the ninety-third reflecting mirror 533, and passing through the seventy-ninth reflecting mirror 516, the seventy-sixth reflecting mirror 517, the ninety-third reflecting mirror 533, and the eighty-seventh reflecting mirror 534 respectively, enter the twenty-third convex lens 535 in parallel. The light pulses are focused and fused by the twenty-third convex lens 535. The fused light pulse is reflected by the ninety-fourth reflecting mirror 536 to the fifth beam splitter 537. The light pulse after passing through the fifth beam splitter 537 is output to the sixth beam splitter 538. The light pulse after passing through the sixth beam splitter 538 is output to the first adjustable aperture 539. The light pulse passes through the first adjustable aperture 539, the variable optical density adjuster 540, the twenty-fourth convex lens 541, the sapphire crystal 542, and the twenty-fifth convex lens 535. The light pulse is incident on the ninety-fifth reflecting mirror 544 after passing through the convex lens 543. The light pulse is reflected by the ninety-fifth reflecting mirror 544 to the fourteenth dichroic mirror 552, and then transmitted through the fourteenth dichroic mirror 552 to the first filter 553. The light pulse output from the other end of the sixth beam splitter 538 is incident on the second adjustable aperture 545. After passing through the second adjustable aperture 545, the light pulse is incident on the ninety-sixth reflecting mirror 546. After being reflected sequentially by the ninety-sixth reflecting mirror 546, the ninety-seventh reflecting mirror 5047, and the ninety-eighth reflecting mirror 548, the light pulse is reflected to the twenty-fifth convex lens 549. After passing through the twenty-fifth convex lens 549, the light pulse passes sequentially through the first BBO crystal 550 and the SF11 glass 551 before being incident on the fourteenth dichroic mirror 552. The light pulse is reflected by the fourteenth dichroic mirror 552 and merged with the light beam that has been reflected by the ninety-fifth reflector 544 and then transmitted through the fourteenth dichroic mirror 552. The merged light beam then passes sequentially through the first filter 553, the second BBO crystal 554, the twenty-sixth convex lens 555, and the second filter 556. After passing through the second filter 556, it is transmitted to the fifteenth dichroic mirror 557. The light pulse is then transmitted through the fifteenth dichroic mirror 557 to the third BBO crystal 564. The light pulse output from the other output end of the fifth beam splitter 537 is incident on the ninety-ninth reflector 559 through the third adjustable aperture 558. The light pulse is reflected by the ninety-ninth reflector 559 to the one hundredth reflector 560, and then reflected by the one hundredth reflector 560 to the one hundred and first reflector 561.The light pulse, after being reflected by the 101st reflecting mirror 561, passes sequentially through the 27th convex lens 562 and the 15th half-wave plate 563. The light pulse is then transmitted through the 15th half-wave plate 563 to the 15th dichroic mirror 557, where it is reflected and merged with the light pulse transmitted through the 15th dichroic mirror 557. The merged light pulse is then transmitted to the third BBO crystal 564, and finally to the 102nd reflecting mirror 565, where it is output.

[0014] Beneficial effects:

[0015] 1. This invention utilizes a liquid crystal spatial light modulator to design a programmable pulse shaping structure for high-order dispersion management within the cavity of a fiber laser, thereby achieving pure fourth-order soliton pulse output.

[0016] 2. This invention utilizes single-mode fiber, polarization-maintaining fiber, and a three-loop polarization controller to design a multi-peak high-order tunable filter, thereby achieving ultra-short pulse output.

[0017] 3. This invention utilizes a lens-based dual-path dispersion delay line to compress the pulse width, thereby achieving femtosecond-level ultrashort pulse output.

[0018] 4. This invention utilizes a reflective liquid crystal spatial light modulator and a chirped Bragg grating to design a two-stage pulse shaping structure, which compensates for the accumulated nonlinear phase shift, further compresses the pulse width, and effectively improves the pulse energy. Attached Figure Description

[0019] Figure 1 This is a block diagram of the overall structure of the present invention.

[0020] Figure 2 This is the optical path diagram of the seed pulse source module used in this invention.

[0021] Figure 3 This is the optical path diagram of the power adjustment module used in this invention.

[0022] Figure 4 This is the optical path diagram of the polarization pulse segmentation module used in this invention.

[0023] Figure 5 This is the optical path diagram of the polarization pulse synthesis module used in this invention.

[0024] Figure 6 This is the optical path diagram of the spectral shaping module used in this invention. Detailed Implementation

[0025] The working principle of the present invention will be further explained below with reference to the accompanying drawings. It should be understood that the component parameters marked in the embodiments are preferred parameters used in each embodiment, rather than limitations on the scope of protection.

[0026] Example 1: Overall Structure of the Invention

[0027] like Figure 1 As shown, the overall structure of the present invention includes: the output end of the seed pulse source 1 is connected to the input end of the power adjustment module 2; the output end of the power adjustment module 2 is connected to the input end of the polarization pulse segmentation module 3; the output end of the polarization pulse segmentation module 3 is connected to the input end of the polarization pulse synthesis module 4; and the output end of the polarization pulse synthesis module 4 is connected to the input end of the spectrum shaping module 5.

[0028] Example 2 Seed Pulse Source Module

[0029] The seed pulse source module 1 has the following structure: a pump source 101 (OCLARO LC962U pump source, center wavelength 980nm, maximum single-mode output optical power 750mW) is connected to the 980nm end of a wavelength division multiplexer 102 (COMCORE 980 / 1060nm single-mode fiber wavelength division multiplexer); the 1550nm end of the wavelength division multiplexer 102 is connected to a first collimator 104 (WT&T M011 collimator) via a first erbium-doped fiber 103 (Thorlabs Er80-4 / 125 erbium-doped fiber). The input terminals are connected, and the optical pulse passes through the first collimator 104, the first quarter-wave plate 105 (Hengyang Optics WPZ4310-248 quarter-wave plate), the first half-wave plate 106 (Hengyang Optics WPZ2310-248 half-wave plate), the first polarization beam splitter 107 (Kongtum QTFBC-1216 fiber polarization beam splitter), the first isolator 108 (Hengyang Optics HOI-005-532 isolator), the second quarter-wave plate 109 (Hengyang Optics WPZ4310-248 quarter-wave plate), and the second collimator. After collimator 110 (WT&T M011 collimator) and third collimator 111 (WT&T M011 collimator), the light pulse is incident on the first reflecting mirror 112 (Hengyang Optics GMH12-005-AU reflecting mirror) via the third collimator 111. The first reflecting mirror 112 reflects the light pulse onto the first grating 113 (LightSmyth LSFSG-1000-3225-94). The light pulse output from the first grating 113 passes through the first convex lens 114 (Hengyang Optics GLH12-002-002-NIR). After passing through a convex lens, a first spatial light modulator 115 (CRI SLM-256-NIR spatial light modulator), a second convex lens 116 (Hengyang Optics GLH12-002-002-NIR convex lens), the light is transmitted to a second grating 117 (LightSmyth LSFSG-1000-3225-94). The second grating 117 reflects the light pulse to a second reflector 118 (Hengyang Optics GMH12-005-AU reflector), and then to a fourth collimator 119 (WT&T M011 collimator).The fourth collimator 119 is connected to the input of the first polarizer 120 (Thorlabs ILP1550SM-APC). The output of the first polarizer 120 is connected to the input of the first polarization controller 121 (Thorlabs FPC562) via a polarization-maintaining fiber. The output of the first polarization controller 121 is connected to the input of the second polarization controller 122 (Thorlabs FPC562) via a polarization-maintaining fiber. The output of the second polarization controller 122 is connected to the input of the second polarizer 123 (Thorlabs ILP1550SM-APC) via a polarization-maintaining fiber. The output of the second polarizer 122 is connected to the common terminal of the wavelength division multiplexer 102. An optical pulse is output from the output terminal of the first polarization beamsplitter 107, perpendicular to the incident direction. The seed source pulse module 1 outputs a high-energy pure fourth-order soliton pulse.

[0030] Example 3: Power Adjustment Module

[0031] The power adjustment module 2 has the following optical path structure: the light pulse is transmitted through the third reflector 201 (GMH12-005-AU reflector from Hengyang Optics Co., Ltd.) to the third grating 202 (130mm×20mm grating from LightSmyth Technologies Co., Ltd.). The third grating 202 transmits the light pulse to the fourth reflector 203 (GMH12-005-AU reflector from Hengyang Optics Co., Ltd.), and then reflects it to the fifth reflector 204 (GMH12-005-AU reflector from Hengyang Optics Co., Ltd.). The fifth reflector 204 reflects the light pulse back to the third grating 202. The pulse output from the third grating 202 is then transmitted through the third convex lens (GLH12-002 from Hengyang Optics Co., Ltd.). The light pulse transmitted from the -002-NIR convex lens 205 to the sixth reflecting mirror 206 (Hengyang Optics GMH12-005-AU reflecting mirror) is then reflected back to the third grating 202 by the third convex lens 205. The light pulse is then transmitted to the fourth reflecting mirror 203 via the third grating 202. The fourth reflecting mirror 203 reflects the light pulse, which is then reflected by the fifth reflecting mirror 204 and incident on the third grating 202. The light pulse output from the third grating 202 is incident on the Polonaise prism 207 and then transmitted through the Polonaise prism 207 (Union The light pulse is reflected back to the third grating 202 by an Optic POP0012-5 Porro prism. After passing through the third grating 202, the light pulse travels again along the route described above, passing through the fourth mirror 203, the fifth mirror 204, the third grating 202, the third convex lens 205, and the sixth mirror 206. After multiple reflections, it returns to the third grating 202, which directs the light pulse to the fourth convex lens 208 (Hengyang Optics GLH12-002-002-NIR convex lens). The light pulse then passes through the fourth convex lens 208, the acousto-optic modulator 209 (Gooch & Housego Fiber-Q acousto-optic modulator), the fifth mirror 206, and the sixth mirror 206. The light pulse is incident on the seventh reflecting mirror 213 (Hengyang Optics Co., Ltd. GMH12-002-002-NIR convex lens) after passing through the convex lens 210 (Hengyang Optics Co., Ltd. HOI-005-532 isolator) and the second half-wave plate 212 (Hengyang Optics Co., Ltd. WPZ2310-248 half-wave plate). The light pulse is then reflected by the seventh reflecting mirror 213 to the eighth reflecting mirror 214 (Hengyang Optics Co., Ltd. GMH12-005-AU reflecting mirror) and then incident on the sixth convex lens 215 (Hengyang Optics Co., Ltd. GLH12-002-002-NIR convex lens).The light pulse passes through the sixth convex lens 215, the fifth collimator 216 (WT&T M011 collimator), the second erbium-doped fiber 217 (Thorlabs Er80-4 / 125 erbium-doped fiber), the sixth collimator 218 (WT&T M011 collimator), and the seventh convex lens 219 (Hengyang Optics GLH12-002-002-NIR convex lens) before being incident on the ninth reflector 220 (Hengyang Optics GMH12-005-AU reflector). The pump light generated by the first photodiode 223 (DILAS D4F2P22-976 photodiode) passes through the seventh collimator 222 (WT&T M011 collimator) and the eighth convex lens 221 (Hengyang Optics GLH12-002-002-NIR convex lens) and is then merged with the light pulse previously incident on the ninth reflector 220. The fused light pulse is reflected by the ninth reflector 220 to the tenth reflector 224 (Hengyang Optics GMH12-005-AU reflector). The tenth reflector 224 reflects the light pulse to the third half-wave plate 225 (Hengyang Optics WPZ2310-248 half-wave plate). The light pulse passes through the third half-wave plate 225, the third quarter-wave plate 226 (Hengyang Optics WPZ4310-248 quarter-wave plate), the bandpass filter 227 (YUNSANDA CW4L2 filter), and the fourth half-wave plate 228 (Hengyang Optics WPZ2310-248 half-wave plate) before being incident on the fourth grating 232 (LightSmyth T-940L-2710-92 grating). The light pulse is transmitted via the fourth grating 232 to the fifth grating 233 (LightSmyth LSFSG-1000-3225-94 pre-processed grating). The fifth grating 233 then transmits the light pulse to the eleventh reflector 234 (Hengyang Optics GMH12-005-AU reflector). The eleventh reflector 234 reflects the pulse back to the fifth grating 233, which then transmits it back to the fourth grating 232. The light pulse output from the fourth grating 232 is transmitted to the twelfth reflector 229 and reflected by it into the fifth half-wave plate 230, finally being output through the second polarization beam splitter 231. The power adjustment module 2 compresses the spectral width of the pulse, reduces the pulse repetition frequency, increases the pulse energy, and performs pre-shaping to compensate for losses caused by the placement of the acousto-optic modulator in the configuration.

[0032] Example 4: Polarization Pulse Segmentation Module

[0033] The polarization pulse splitting module has the following optical path structure: the light pulse is incident on the input end of the third polarization beam splitter 302 (Kongtum QTFBC-1216 polarization beam splitter) via the sixth half-wave plate 301 (Hengyang Optics WPZ2310-248 half-wave plate), and then transmitted from the output end of the third polarization beam splitter 302 perpendicular to the incident direction through the fourth quarter-wave plate 303 (Hengyang Optics WPZ4310-248 quarter-wave plate) to the thirteenth reflector 304 (Hengyang Optics GMH12-005). The thirteenth reflector 304 reflects the light pulse back to the fourth quarter-wave plate 303, which then transmits the light pulse to the third polarization beam splitter 302. Simultaneously, the light pulse is output from another output end of the third polarization beam splitter 302 perpendicular to the incident direction. It then passes through the fifth quarter-wave plate 305 (Hengyang Optics WPZ4310-248 quarter-wave plate) and is transmitted to the fourteenth reflector 306 (Hengyang Optics GMH12-005-AU reflector) and the first piezoelectric actuator 307 (GO STAGE). After passing through the LLS4545, the light pulse is reflected back to the fifth quarter-wave plate 305 by the fourteenth mirror 306. The fifth quarter-wave plate 305 then transmits the light pulse back to the third polarization beam splitter 302. The light pulse is output from the port of the third polarization beam splitter 302 parallel to the incident direction and transmitted through the seventh half-wave plate 308 (Hengyang Optics WPZ2310-248 half-wave plate) to the fourth polarization beam splitter 309 (Kongtum QTFBC-1216 polarization beam splitter). The light pulse then passes from the port of the fourth polarization beam splitter 309 perpendicular to the incident direction through the sixth quarter-wave plate 310 (Kongtum QTFBC- The light pulse is transmitted from the 1216 polarization beam splitter to the fifteenth mirror 311 (Hengyang Optics GMH12-005-AU mirror). The fifteenth mirror 311 reflects the light pulse back to the sixth quarter-wave plate 310. The sixth quarter-wave plate 310 then transmits the light pulse back to the fourth polarization beam splitter 309. Simultaneously, the light pulse travels from the port of the fourth polarization beam splitter 309 perpendicular to the incident direction through the seventh quarter-wave plate 312 (Hengyang Optics WPZ4310-248 quarter-wave plate) to the sixteenth mirror 313 (Hengyang Optics GMH12-005-AU mirror) and the second piezoelectric driver 314 (GO STAGE LLS4545). The light pulse is then reflected back to the seventh quarter-wave plate 312 by the fifteenth mirror 313. The seventh quarter-wave plate 312 then transmits the light pulse back to the fourth polarization beam splitter 309.The light pulse is output from the output end of the fourth polarization beam splitter 309, which is parallel to the incident direction. It passes through the ninth convex lens 315 (Hengyang Optics GLH12-002-002-NIR convex lens) and the tenth convex lens 316 (Hengyang Optics GLH12-002-002-NIR convex lens) and is incident on the tilted chirped Bragg grating 324 (Teraxion DMR). The long-wavelength component of the light pulse is transmitted from the back of the tilted chirped Bragg grating 324 to the seventeenth reflector 322, and then reflected by the seventeenth reflector 322. The light pulse is then transmitted to the second spatial light modulator 323 (FSLM-4K70-P combined with liquid crystal on silicon reflective spatial light modulator), and incident from the second spatial light modulator 323 to the seventeenth reflector 322 (Hengyang Optics GMH12-005-AU reflector). The seventeenth reflector 322 reflects the light pulse back to the tilted chirped Bragg grating 324. The light pulse is then fused with the short-wave component that was previously incident on the tilted chirped Bragg grating 324 and reflected from its front surface. The light pulse then passes through the eighth half-wave plate 320 (Hengyang Optics WPZ2310). The light pulse (-248 half-wave plate) is transmitted to the first thin-film polarizer 319. The light pulse is split into a main light pulse and a rejection light pulse by the first thin-film polarizer 319. The rejection light pulse is transmitted through the first thin-film polarizer 319 to the beam cutoff 318 (Ophir Optronics Solutions Ltd. PD300-IR). The main light pulse is reflected by the first thin-film polarizer 319 (Thorlabs LPNIRE11S) to the wedge beam splitter 325 (Thorlabs BSF2550) and then output. The polarization pulse splitting module 3 realizes time-division replication of the pulse, pre-compensates for the nonlinear phase shift accumulated during pulse transmission, and compresses the pulse width.

[0034] Example 5: Polarization Pulse Synthesis Module

[0035] The polarization pulse synthesis module has the following optical path structure: A light pulse is incident on the input of the first beam splitter 4001 (SIGMA OBCL20-1064-R5), and transmitted from the output of the first beam splitter 4001 to the eighteenth reflector 4002. The light pulse is reflected by the eighteenth reflector 4002 (Hengyang Optics GMH12-005-AU reflector) to the nineteenth reflector 4003 (Hengyang Optics GMH12-005-AU reflector), and then reflected by the nineteenth reflector 4003 to the twentieth reflector 4004 (Hengyang Optics GMH12-005-AU reflector). The twentieth reflector 4004 reflects the light pulse to the twenty-first reflector 4005 (Hengyang Optics GMH12-005-AU reflector), and then reflected by the twenty-first reflector 4005 to the eleventh convex lens 4006. The light pulse, after passing through the eleventh convex lens 4006, the twelfth convex lens 4007 (Hengyang Optics GLH12-002-002-NIR convex lens), and the first dichroic mirror 4008 (Thorlabs DMSP1180 dichroic mirror), is transmitted and output through the first dichroic mirror 4008. This light pulse merges with the light pulse reflected from the fifty-fifth reflecting mirror 4105 (Hengyang Optics GMH12-005-AU reflecting mirror) to the first dichroic mirror 4008. The merged light pulse is then transmitted through the first dichroic mirror 4008 to the first KTiAsO4 crystal 4009 (DIENTECH density 3.454 g / cm³). 3The light pulse is transmitted through the first KTiAsO4 crystal 4009 to the second dichroic mirror 4010 (Thorlabs DMSP1180 dichroic mirror). The short-wavelength light pulse reflected from the second dichroic mirror 4010 is transmitted to the twenty-second mirror 4101 (Hengyang Optics GMH12-005-AU mirror). The long-wavelength light pulse transmitted from the second dichroic mirror 4010 is transmitted to the third dichroic mirror 4011 (Thorlabs DMSP1180 dichroic mirror). The light pulse reflected by the dichroic mirror 4011 is transmitted to the twenty-third reflecting mirror 4102 (Hengyang Optics GMH12-005-AU reflecting mirror). The light pulse transmitted from the third dichroic mirror 4011 is incident on the twenty-fourth reflecting mirror 4012. The light pulse is reflected by the twenty-fourth reflecting mirror 4012 to the twenty-fifth reflecting mirror 4013 (Hengyang Optics GMH12-005-AU reflecting mirror). The light pulse is then reflected by the twenty-fifth reflecting mirror 4013 to the thirteenth convex lens 4014 (Hengyang Optics GLH12-002-002-). The light pulse is transmitted through the thirteenth convex lens 4014 to the fourteenth convex lens 4015 (Hengyang Optics GLH12-002-002-NIR convex lens). After passing through the fourteenth convex lens 4015, it enters the twenty-sixth reflecting mirror 4016 (Hengyang Optics GMH12-005-AU reflecting mirror). The light pulse is reflected by the twenty-sixth reflecting mirror 4016 to the twenty-seventh reflecting mirror 4017 (Hengyang Optics GMH12-005-AU reflecting mirror), and then reflected by the twenty-seventh reflecting mirror 4017 to the... The 28th reflector 4018 (Hengyang Optics GMH12-005-AU reflector) reflects the light to the 29th reflector 4019 (Hengyang Optics GMH12-005-AU reflector), then to the 4th dichroic mirror 4020 (Thorlabs DMSP1180 dichroic mirror), and finally to the 2nd KTiAsO4 crystal 4021 (DIENTECH, density 3.454 g / cm³). 3The light pulse is transmitted through the second KTiAsO4 crystal 4021 to the fifth dichroic mirror 4022 (Thorlabs DMSP1180 dichroic mirror). The light pulse reflected from the fifth dichroic mirror 4022 is transmitted to the thirtieth mirror 4103 (Purshee Experiments BK-7 dichroic mirror). The light pulse transmitted from the fifth dichroic mirror 4022 is transmitted to the sixth dichroic mirror 4023. The light pulse reflected from the sixth dichroic mirror 4023 (Thorlabs DMSP1180 dichroic mirror) is transmitted to the thirty-first mirror 4104 (Purshee...). The light pulse transmitted from the sixth dichroic mirror 4023 (Experiment BK-7 reflector) is incident on the fifteenth convex lens 4024 (Hengyang Optics GLH12-002-002-NIR convex lens), then transmitted to the sixteenth convex lens 4025 (Hengyang Optics GLH12-002-002-NIR convex lens), and finally incident on the sixth grating 4027 (LightSmyth LFSSG-1000-3225-94 grating). The sixth grating 4027 reflects the light pulse to the seventh grating 4028 (LightSmyth LSFSG-1000-3225-94 grating). The seventh grating 4028 reflects the light pulse to the first roof mirror 4029 (Hongsheng Optoelectronics HS-002103). After reaching the first roof mirror 4029, the light pulse is reflected back to the sixth grating 4027 along the input path. The sixth grating 4027 transmits the light pulse to the thirty-second reflector 4026 (Hengyang Optics GMH12-005-AU reflector). The light pulse then passes through the thirty-second reflector... The light is reflected by mirror 4026 to mirror 4030 (Hengyang Optics GMH12-005-AU mirror), then by mirror 4030 to mirror 4031 (Hengyang Optics GMH12-005-AU mirror), then by mirror 4031 to mirror 4032 (Hengyang Optics GMH12-005-AU mirror), then by mirror 4032 to mirror 4033 (Hengyang Optics GMH12-005-AU mirror), and finally by mirror 4032 to mirror 4033 (Hengyang Optics GMH12-005-AU mirror). The light pulse is reflected by the thirty-sixth reflector 4033 to the knife-edge prism 4084 (Hongsheng Optoelectronics HS-002103), and then transmitted from the other output end of the first beam splitter 4001 to the thirty-seventh reflector 4034 (Hengyang Optics GMH12-005-AU reflector). The light pulse is then reflected by the thirty-seventh reflector 4034 to the thirty-eighth reflector 4035 (Hengyang Optics GMH12-005-AU reflector), and then reflected by the thirty-eighth reflector 4035 to the thirty-ninth reflector 4036 (Hengyang Optics GMH12-005-AU reflector).The light pulse is reflected by the 39th reflector 4036 to the 40th reflector 4037 (Hengyang Optics GMH12-005-AU reflector), then by the 40th reflector 4037 to the 41st reflector 4038 (Hengyang Optics GMH12-005-AU reflector). The light pulse is then reflected by the 41st reflector 4038 to the 17th convex lens 4039 (Hengyang Optics GLH16-8x4-004-NIR concave lens). Finally, the light pulse passes through the 17th convex lens 4039 and the 18th convex lens 4040 (Hengyang Optics GLH16-8x4-004). After passing through a NIR concave lens, the light pulse is reflected by the eighteenth convex lens 4040 to the seventh dichroic mirror 4041 (Thorlabs DMSP1180 dichroic mirror). The light pulse is then transmitted through the seventh dichroic mirror 4041 and merges with the light pulse reflected from the fifty-eighth reflecting mirror 4106 (Purshee Experiment BK-7 reflecting mirror). The merged light pulse is then incident through the seventh dichroic mirror 4041 onto the third KTiAsO4 crystal 4042 (DIENTECH, density 3.454 g / cm³). 3The light pulse is transmitted through the third KTiAsO4 crystal 4042 to the eighth dichroic mirror 4043 (Thorlabs DMSP1180 dichroic mirror). The light pulse reflected from the eighth dichroic mirror 4043 is reflected to the forty-second mirror 4044 (Hengyang Optics GMH12-005-AU mirror). The light pulse transmitted from the eighth dichroic mirror 4043 is transmitted to the ninth dichroic mirror 4045. The light pulse reflected by the ninth dichroic mirror 4045 (Thorlabs DMSP1180 dichroic mirror) is transmitted to the forty-third mirror 4046 (Hengyang Optics GMH1). The light pulse output from the ninth dichroic mirror 4045 (2-005-AU reflector) is incident on the forty-third reflector 4046. The light pulse transmitted through the ninth dichroic mirror 4045 is then incident on the forty-fourth reflector 4047 (Hengyang Optics GMH12-005-AU reflector). After being reflected by the forty-fourth reflector 4047, it is incident on the forty-fifth reflector 4048 (Hengyang Optics GMH12-005-AU reflector). After being reflected by the forty-fifth reflector 4048, it is incident on the nineteenth convex lens 4049 (Hengyang Optics GLH12-002-002-NIR convex lens). The light pulse then passes through the nineteenth convex lens... Lens 4049 and the twentieth convex lens 4050 (Hengyang Optics GLH12-002-002-NIR convex lens) are incident on the forty-sixth reflecting mirror 4051 (Hengyang Optics GMH12-005-AU reflecting mirror). The light pulse is reflected by the forty-sixth reflecting mirror 4051 to the forty-seventh reflecting mirror 4052 (Hengyang Optics GMH12-005-AU reflecting mirror), then to the forty-eighth reflecting mirror 4053 (Hengyang Optics GMH12-005-AU reflecting mirror), and finally to the forty-ninth reflecting mirror 4054. The light pulse from the (Hengyang Optics GMH12-005-AU reflector) is reflected by the 49th reflector 4054 to the 10th dichroic mirror 4055 (Thorlabs DMSP1180 dichroic mirror). The light pulse is then transmitted through the 10th dichroic mirror 4055 and fused with the light pulse reflected by the 59th reflector 4083 (Hengyang Optics GMH12-005-AU reflector) to the 10th dichroic mirror 4055 (Thorlabs DMSP1180 dichroic mirror). This light pulse is then incident on the fourth KTiAsO4 crystal 4056 (DIENTECH density 3.454 g / cm³). 3The light pulse is transmitted through the fourth KTiAsO4 crystal 4056 to the eleventh dichroic mirror 4057 (Thorlabs DMSP1180 dichroic mirror). The light pulse reflected from the eleventh dichroic mirror 4057 (Thorlabs DMSP1180 dichroic mirror) is transmitted to the fiftieth mirror 4058 (Hengyang Optics GMH12-005-AU mirror). The light pulse transmitted from the eleventh dichroic mirror 4057 is transmitted to the twelfth dichroic mirror 4059. The light pulse reflected by the Thorlabs DMSP1180 dichroic mirror is transmitted to the fifty-first mirror 4060 (Hengyang Optics GMH12-005-AU mirror). The light pulse transmitted from the twelfth dichroic mirror 4059 is incident on the twenty-first convex lens 4061 (Hengyang Optics GLH12-002-002-NIR convex lens), and then transmitted to the twenty-second convex lens 4062 (Hengyang Optics GLH12-002-002-NIR convex lens). The light pulse is incident on the eighth grating 4063 (LightSmyth T-1702-1030s) by the convex lens 4062. The eighth grating 4063 reflects the light pulse to the ninth grating 4064 (LightSmyth T-1702-1030s), which in turn reflects it to the second roof mirror 4065 (Hongsheng Optoelectronics HS-002103). After reaching the second roof mirror 4065, the light pulse is reflected back to the eighth grating 4063 along the input path. The eighth grating 4063 then... The pulse is transmitted to the 52nd reflector 4066 (Hengyang Optics GMH12-005-AU reflector). The pulse is then reflected by the 52nd reflector 4066 to the 53rd reflector 4067 (Hengyang Optics GMH12-005-AU reflector), and then by the 53rd reflector 4067 to the 54th reflector 4068 (Hengyang Optics GMH12-005-AU reflector). Finally, the pulse is reflected by the 54th reflector 4068 to the knife-edge prism 4084, and then emitted by the laser 4069 (EKSPLA APL). The light pulse pumped by the 2105 commercial picosecond Nd:YAG laser is transmitted to the thirteenth dichroic mirror 4070 (Thorlabs DMSP1180 dichroic mirror). The light pulse reflected from the thirteenth dichroic mirror 4070 passes through the ninth half-wave plate 4071 (Hengyang Optics WPZ2310-248 half-wave plate) and is incident on the second thin-film polarizer 4072 (Thorlabs LPNIRE11S). The parallel polarized light pulse transmitted through the second thin-film polarizer 4072 is incident on the fifty-fifth mirror 4105. The light pulse is reflected by the fifty-fifth mirror 4105 to the first dichroic mirror 4008, and then the vertically polarized light pulse reflected by the second thin-film polarizer 4072 is incident on the third thin-film polarizer 4073 (Thorlabs LPNIRE11S).The light pulse is reflected by the third thin-film polarizer 4072 and then transmitted through the tenth half-wave plate 4074 (Hengyang Optics WPZ2310-248 half-wave plate) and the third erbium-doped fiber 4075 (Thorlabs Er80-4 / 125 erbium-doped fiber) to the fifty-sixth reflector 4076 (Hengyang Optics GMH12-005-AU reflector). The light pulse is then reflected by the fifty-sixth reflector 4076 to the fourth dichroic mirror 4020. The light pulse reflected by the fourth dichroic mirror 4020 merges with the light pulse that was incident on the fourth dichroic mirror 4020 through the twenty-ninth reflector 4019 and then transmitted out through the fourth dichroic mirror 4020. The merged light pulse is then incident on the second KTiAsO4 crystal 4021 and output from the thirteenth dichroic mirror 4070. The emitted light pulse is transmitted through the 57th reflecting mirror 4077 (Hengyang Optics GMH12-005-AU reflecting mirror) to the 11th half-wave plate 4078 (Hengyang Optics WPZ2310-248 half-wave plate). The light pulse is then incident on the 4th thin-film polarizer 4079 (Thorlabs LPNIRE11S) via the 11th half-wave plate 4078. The parallel polarized light pulse transmitted through the 4th thin-film polarizer 4079 is incident on the 58th reflecting mirror 4106 (Hengyang Optics GMH12-005-AU reflecting mirror). The light pulse is reflected by the 58th reflecting mirror 4106 to the 7th dichroic mirror 4041. The vertically polarized light pulse reflected by the 4th thin-film polarizer 4079 is incident on the 5th thin-film polarizer 4080 (Thorlabs). The light pulse (LPNIRE11S) is reflected by the fifth thin-film polarizer 4080 and then transmitted through the twelfth half-wave plate 4081 (Hengyang Optics WPZ2310-248 half-wave plate) and the fourth erbium-doped fiber 4082 (Thorlabs Er80-4 / 125 erbium-doped fiber) to the fifty-ninth reflector 4083 (Hengyang Optics GMH12-005-AU reflector). The light pulse is reflected by the fifty-ninth reflector 4083 to the tenth dichroic mirror 4055. Finally, two light pulses with the same energy and pulse duration are incident on the knife-edge prism 4084 and transmitted through the knife-edge prism 4084 to the sixtieth reflector 4085 (Hengyang Optics GMH12-005-AU reflector). The light pulse is then transmitted through the fifth thin-film polarizer 4080 and the sixth half-wave plate 4081 (Hengyang Optics WPZ2310-248 half-wave plate) and the fourth erbium-doped fiber 4082 (Thorlabs Er80-4 / 125 erbium-doped fiber) to the sixtieth reflector 4085. The light pulses are reflected by mirror 4085 (60th reflector) to mirror 4086 (Hengyang Optics GMH12-005-AU reflector), and then to lens 4087 (Hengyang Optics GMH12-005-AU reflector). The two light pulses are then fused by lens 4087. The fused light pulse is then incident on beam splitter 4088 (Kongtum QTFBC-1216 beam splitter). The light pulse is output from the output end of beam splitter 4088 perpendicular to the incident direction. The light pulse is then reflected by mirror 4089 (Hengyang Optics GMH12-005-AU reflector) to mirror 4090 (Hengyang Optics GMH12-005-AU reflector).The light pulse is reflected by the 63rd reflector 4090 to the 64th reflector 4091, then by the 64th reflector 4091 (Hengyang Optics GMH12-005-AU reflector) to the 65th reflector 4092 (Hengyang Optics GMH12-005-AU reflector), and finally by the 65th reflector 4092 back to the fifth polarization beam splitter 4088. The pulse is then output from the output end of the fifth polarization beam splitter 4088, parallel to the incident direction. After output from the 4088 beam splitter, the light pulse is transmitted through the thirteenth half-wave plate 4093 (Hengyang Optics WPZ2310-248 half-wave plate) to the sixth polarization beam splitter 4094 (Kongtum QTFBC-1216 polarization beam splitter). The light pulse is then transmitted along the output end of the sixth polarization beam splitter 4094 perpendicular to the incident direction to the sixty-sixth reflector 4095 (Hengyang Optics GMH12-005-AU reflector). The light pulse is then reflected by the sixty-sixth reflector 4095. The light pulse is reflected by the sixty-seventh reflector 4096 (Hengyang Optics GMH12-005-AU reflector), then by the sixty-eighth reflector 4097 (Hengyang Optics GMH12-005-AU reflector), then by the sixty-eighth reflector 4097 to the sixty-ninth reflector 4098 (Hengyang Optics GMH12-005-AU reflector), and finally by the sixty-ninth reflector 4098 back to the sixth polarization beam splitter 4094. The light pulse is output from another output terminal parallel to the incident direction of the sixth polarization beamsplitter 4094. It is then transmitted via the sixth polarization beamsplitter to the fourteenth half-wave plate 4099 (Hengyang Optics WPZ2310-248 half-wave plate), and then via the fourteenth half-wave plate 499 to the seventh polarization beamsplitter 4100 (Kongtum QTFBC-1216 polarization beamsplitter), and finally output from the seventh polarization beamsplitter 4100. The polarization pulse synthesis module 4 amplifies the power of the pulse.

[0036] Example 6: Spectral Shaping Module

[0037] The spectral shaping module 5 has the following optical path structure: the light pulse is incident on the third beam splitter 502 (SIGMA OBCL20-1064-R5) after passing through the second beam splitter 501 (SIGMA OBCL20-1064-R5). The light pulse is then transmitted to the 70th reflector 503 (Hengyang Optics GMH12-005-AU reflector) after being reflected by the 70th reflector 503. After being reflected by the 71st reflector 504 (Hengyang Optics GMH12-005-AU reflector), the 72nd reflector 505 (Hengyang Optics GMH12-005-AU reflector), and the 73rd reflector 506 (Hengyang Optics GMH12-005-AU reflector), the light pulse reflected by the 73rd reflector 506 is incident on the 10th grating 512 (LightSmyth LSF). The tenth grating 512 reflects the light pulse to the eleventh grating 513 (LightSmyth LSFSG-1000-3225-94 grating). The eleventh grating 513 reflects the light pulse to the seventy-fourth mirror 514 (Hengyang Optics GMH12-005-AU mirror). After reaching the seventy-fourth mirror 514, the light pulse is reflected back to the tenth grating 512 along the input path. The tenth grating 512 transmits the light pulse to the seventy-fifth mirror 515 (Hengyang Optics GMH12-005-AU mirror). The light pulse is then reflected by the seventy-fifth mirror 515 to the seventy-sixth mirror 515. The light pulse from the 17th (Hengyang Optics GMH12-005-AU reflector) is incident on the 23rd convex lens 535 via the 76th reflector 517. The light pulse output from the other output end of the third beam splitter 502 is transmitted to the 77th reflector 507. After being reflected by the 77th reflector 507, the light pulse passes sequentially through the 78th (Hengyang Optics GMH12-005-AU reflector), 79th (Hengyang Optics GMH12-005-AU reflector), 80th (Hengyang Optics GMH12-005-AU reflector), and 81st (Hengyang Optics GMH12-005-AU reflector) mirrors. The light pulse reflected by the eighty-first mirror 511 and the light pulse reflected by the seventieth mirror 506 enter the tenth grating 512 in parallel. Following the incident path described above, the light pulse incident from the fortieth mirror 506 (Hengyang Optics GMH12-005-AU mirror) to the tenth grating 512 passes sequentially through the tenth grating 512, the eleventh grating 513, and the seventy-fourth mirror 514, before returning to the tenth grating 512 along the input path. The light pulse is then transmitted from the tenth grating 512 to the seventy-fifth mirror 515 (Hengyang Optics GMH12-005-AU mirror), and reflected by the seventy-fifth mirror 515 to the seventy-ninth mirror 516.The light pulse, incident on the 79th reflector 516 (Hengyang Optics GMH12-005-AU reflector), is transmitted to the 23rd convex lens 535 (Hengyang Optics GLH12-002-002-NIR convex lens). The light pulse output from the other output end of the second beam splitter 501 is then transmitted to the 80th reflector 518 (Hengyang Optics GMH12-005-AU reflector), and finally to the fourth beam splitter 519 (SIGMA). The optical pulse (OBCL20-1064-R5) is transmitted from the output of the fourth beam splitter 519 to the eighty-first reflector 520 (Hengyang Optics GMH12-005-AU reflector). After being reflected by the eighty-first reflector 520, the optical pulse is then reflected sequentially by the eighty-second reflector 521 (Hengyang Optics GMH12-005-AU reflector), the eighty-third reflector 522 (Hengyang Optics GMH12-005-AU reflector), and the eighty-fourth reflector 523 (Hengyang Optics GMH12-005-AU reflector). The light pulse reflected by the eighty-fourth reflector 523... A light pulse is incident on the twelfth grating 529 (LightSmyth LFSSG-1000-3225-94 grating). The twelfth grating 529 reflects the light pulse to the thirteenth grating 530 (LightSmyth LFSSG-1000-3225-94 grating). The thirteenth grating 530 reflects the light pulse to the eighty-fifth mirror 531 (Hengyang Optics GMH12-005-AU mirror). After reaching the eighty-fifth mirror 531, the light pulse is reflected back to the twelfth grating 529 along the input path. The twelfth grating 529 then transmits the light pulse to the eighty-sixth mirror. The light pulse is reflected by the eighty-sixth reflector 532 (Hengyang Optics GMH12-005-AU reflector) to the eighty-seventh reflector 534 (Hengyang Optics GMH12-005-AU reflector). It then enters the twenty-third convex lens 535 via the eighty-seventh reflector 534. The light pulse output from the other output end of the fourth beam splitter 519 is transmitted to the eighty-eighth reflector 524. After being reflected by the eighty-eighth reflector 524, the light pulse passes sequentially through the eighty-ninth reflector 525 (Hengyang Optics GMH12-005-AU reflector) and the ninetieth reflector 526 (Hengyang Optics GMH12-005-AU reflector). The light pulses reflected by the ninety-first mirror 527 (GMH12-005-AU reflector) and the ninety-second mirror 528 (GMH12-005-AU reflector) enter the twelfth grating 529 in parallel with the light pulses reflected by the eighty-fourth mirror 523. As described above, the incident path of the light pulse from the eighty-fourth mirror 523 to the twelfth grating 529 passes through the twelfth grating 529, the thirteenth grating 530, and the eighty-fifth mirror 531 in sequence, and returns to the twelfth grating 529 along the input path.The light pulse is transmitted from the 12th grating 529 to the 86th reflector 532. The light pulse is reflected by the 86th reflector 532 to the 93rd reflector 533 (Hengyang Optics GMH12-005-AU reflector). It then enters the 23rd convex lens 535 via the 93rd reflector 533. The four light pulses, passing through the 79th reflector 516, 76th reflector 517, 93rd reflector 533, and 87th reflector 534 (Hengyang Optics GMH12-005-AU reflector), enter the 23rd convex lens 535 in parallel. The light pulses are focused and fused by the 23rd convex lens 535. The fused light pulse is reflected by the 94th reflector 536 (Hengyang Optics GMH12-005-AU reflector) to the 5th beam splitter 537 (SIGMA). The optical pulse from the OBCL20-1064-R5 beam splitter 537 is output to the sixth beam splitter 538 (SIGMAOBCL20-1064-R5). The optical pulse from the sixth beam splitter 538 is then output to the first adjustable aperture 539 (Thorlabs ID25). The optical pulse then passes through the first adjustable aperture 539, the variable optical density adjuster 540 (Thorlabs NEV0830M), the twenty-fourth convex lens 541 (Hengyang Optics GLH12-002-002-NIR convex lens), and the sapphire crystal 542 (Optogama). A 5mm thick c-cut sapphire crystal, along with a 25th convex lens 543 (Hengyang Optics GLH12-002-002-NIR convex lens), is incident on a 95th reflecting mirror 544 (Hengyang Optics GMH12-005-AU reflecting mirror). The light pulse is reflected by the 95th reflecting mirror 544 to the 14th dichroic mirror 552 (Thorlabs DMSP1180 dichroic mirror), and then transmitted through the 14th dichroic mirror 552 to the first filter 553 (Hengyang Optics HANF-D25-006 T:25%). The light pulse output from the other end of the 6th beam splitter 538 is incident on the second adjustable aperture 545 (Thorlabs). The light pulse (ID25) is incident on the ninety-sixth reflector 546 (Hengyang Optics GMH12-005-AU reflector) after passing through the second adjustable aperture 545. The light pulse is then reflected sequentially by the ninety-sixth reflector 546, the ninety-seventh reflector 5047 (Hengyang Optics GMH12-005-AU reflector), and the ninety-eighth reflector 54 (Hengyang Optics GMH12-005-AU reflector). Finally, the light pulse is reflected to the twenty-fifth convex lens 549 (Hengyang Optics GLH12-002-002-NIR convex lens). After passing through the twenty-fifth convex lens 549, the light pulse passes sequentially through the first BBO crystal 550 (2mm thick BBO crystal) and the SF11 glass 551 (SCHOTT Advanced Optocs 1000934).The light pulse is incident on the fourteenth dichroic mirror 552 (Thorlabs DMSP1180 dichroic mirror). Reflected by the fourteenth dichroic mirror 552, it merges with the beam reflected by the ninety-fifth reflector 544 and transmitted out after passing through the fourteenth dichroic mirror 552. The merged beam then passes sequentially through the first filter 553, the second BBO crystal 554 (2mm thick BBO crystal), the twenty-sixth convex lens 555 (Hengyang Optics GLH12-002-002-NIR convex lens), and the second filter 556 (Hengyang Optics HANF-D25-006 T:25%). After passing through the second filter 556, the light pulse is transmitted to the fifteenth dichroic mirror 557 (Thorlabs DMSP1180 dichroic mirror). The light pulse is then transmitted through the fifteenth dichroic mirror 557 to the third BBO crystal 564. The light pulse output from the other output end of the fifth beam splitter 537 passes through the third adjustable aperture 558 (Thorlabs...). The light pulse (ID25) is incident on the 99th reflector 559 (Hengyang Optics GMH12-005-AU reflector). The light pulse is reflected by the 99th reflector 559 to the 100th reflector 560 (Hengyang Optics GMH12-005-AU reflector), then reflected by the 100th reflector 560 to the 101st reflector 561 (Hengyang Optics GMH12-005-AU reflector). After being reflected by the 101st reflector 561, the light pulse passes sequentially through the 27th convex lens 562 (Hengyang Optics GLH12-002-00). The optical pulse is transmitted through a 2-NIR convex lens and a fifteenth half-wave plate 563 (Hengyang Optics WPZ2310-248 half-wave plate). The light pulse is then transmitted to the fifteenth dichroic mirror 557, reflected, and fused with the light pulse transmitted through the fifteenth dichroic mirror 557. The fused light pulse is then transmitted to a third BBO crystal 564 (2mm thick BBO crystal), and then to the one hundred and second reflecting mirror 565 (Hengyang Optics GMH12-005-AU reflecting mirror) for output. A spectral shaping module 5 further compresses the pulse width and shifts the center wavelength of the light pulse, outputting a high-energy femtosecond soliton pulse.

[0038] Example 7: Working principle of the present invention

[0039] The working principle of the present invention will be explained in conjunction with the above embodiments and accompanying drawings.

[0040] The seed pulse source module 1 employs a spatial light modulator to design a programmable pulse shaping structure for high-order dispersion management within the fiber laser cavity. The first polarizer 120, first polarization controller 121, second polarization controller 122, and second polarizer 123 are connected via polarization-maintaining fiber to form a multi-peak high-order tunable filter, enabling the fiber laser cavity output to produce high-energy pure fourth-order soliton pulses unrestricted by soliton area theory. The power adjustment module 2 combines a third grating 202 and an optical lens to compress the pulse spectral width, preventing damage to the amplified devices. The acousto-optic modulator 209 reduces the optical pulse repetition frequency, allowing for higher pulse energy in subsequent structures. A second-order high-order dispersion control structure, composed of a second spatial light modulator 323 and a tilted chirped Bragg grating, pre-compensates for the accumulated nonlinear phase shift in the system, compressing the pulse width. The polarization pulse synthesis module 4 achieves power amplification through multi-channel multiplexing technology. The spectral shaping module 5 uses a lens-based dual-path dispersion delay line compression structure to further shape the optical pulse, obtaining high-energy ultrashort pulse output.

Claims

1. A high-energy ultrashort pure quaternary soliton fiber laser system based on pulse shaping, the structure of which is as follows: the output end of the seed pulse source (1) is connected to the input end of the power adjustment module (2), the output end of the power adjustment module (2) is connected to the input end of the polarization pulse segmentation module (3), the output end of the polarization pulse segmentation module (3) is connected to the input end of the polarization pulse synthesis module (4), and the output end of the polarization pulse synthesis module (4) is connected to the input end of the spectral shaping module (5); The seed pulse source (1) is structured as follows: the pump source (101) is connected to the 980nm end of the wavelength division multiplexer (102), and the 1550nm end of the wavelength division multiplexer (102) is connected to the input end of the first collimator (104) through the first erbium-doped fiber (103). After the light pulse passes through the first collimator (104), the first quarter-wave plate (105), the first half-wave plate (106), the first polarization beam splitter (107), the first isolator (108), the second quarter-wave plate (109), the second collimator (110), and the third collimator (111), the light pulse is incident on the first mirror (112) through the third collimator (111). The first mirror (112) reflects the light pulse onto the first grating (113). The light pulse output by the first grating (113) passes through the first convex lens (114) and the first spatial light modulator. After passing through the second convex lens (115) and the second convex lens (116), the light pulse is transmitted to the second grating (117). The second grating (117) reflects the light pulse to the second mirror (118), and then to the fourth collimator (119). The fourth collimator (119) is connected to the input of the first polarizer (120). The output of the first polarizer (120) is connected to the input of the first polarization controller (121) through a polarization-maintaining fiber. The output of the first polarization controller (121) is connected to the input of the second polarization controller (122) through a polarization-maintaining fiber. The output of the second polarization controller (122) is connected to the input of the second polarizer (123) through a polarization-maintaining fiber. The output of the second polarizer (123) is connected to the common end of the wavelength division multiplexer (102). The light pulse is output from the output end of the first polarization beam splitter (107) perpendicular to the incident direction. The power adjustment module (2) has the following optical path structure: the light pulse is transmitted to the third grating (202) via the third reflector (201), the third grating (202) transmits the light pulse to the fourth reflector (203), and then reflects it to the fifth reflector (204). The fifth reflector (204) reflects the light pulse back to the third grating (202). The pulse output by the third grating (202) is transmitted to the sixth reflector (206) via the third convex lens (205), and then reflected back to the third grating (202) via the third convex lens (205). The light pulse is then transmitted to the fourth reflector (203) via the third grating (202), the fourth reflector (203) reflects the light pulse and then reflects it back to the third grating (202) via the fifth reflector (204). (202) The light pulse output from the third grating (202) is incident on the Pollo prism (207) and reflected back to the third grating (202) by the Pollo prism (207). After passing through the third grating (202), the light pulse passes through the fourth mirror (203), the fifth mirror (204), the third grating (202), the third convex lens (205), and the sixth mirror (206) again according to the route described above. After multiple reflections, it returns to the third grating (202). The third grating (202) incident the light pulse onto the fourth convex lens (208). After passing through the fourth convex lens (208), the acousto-optic modulator (209), the fifth convex lens (210), the second isolator (211), and the second half-wave plate (212), the light pulse is incident onto the seventh mirror (208). (213) The light pulse is reflected by the seventh mirror (213) to the eighth mirror (214) and then incident on the sixth convex lens (215). The light pulse passes through the sixth convex lens (215), the fifth collimator (216), the second erbium-doped fiber (217), the sixth collimator (218), and the seventh convex lens (219) and then incident on the ninth mirror (220). The pump light generated by the first photodiode (223) passes through the seventh collimator (222) and the eighth convex lens (221) and then merges with the light pulse that was previously incident on the ninth mirror (220). The merged light pulse is reflected by the ninth mirror (220) to the tenth mirror (224), and the tenth mirror (224) reflects the light pulse to the third half-wave plate (225). The light pulse passes through the third half-wave plate (225), the third quarter-wave plate (226), the bandpass filter (227), and the fourth half-wave plate (228) before being incident on the fourth grating (232); the light pulse is transmitted through the fourth grating (232) to the fifth grating (233), and the fifth grating (233) transmits the light pulse to the eleventh mirror (234); the eleventh mirror (234) reflects the pulse back to the fifth grating (233), and the light pulse is transmitted through the fifth grating (233) to the fourth grating (232); the light pulse output from the fourth grating (232) is transmitted to the twelfth mirror (229), and is reflected by the twelfth mirror (229) into the fifth half-wave plate (230), and finally output through the second polarization beam splitter (231); The polarization pulse splitting module has the following optical path structure: the light pulse is incident on the input end of the third polarization beam splitter (302) through the sixth half-wave plate (301), and the light pulse is transmitted from the output end of the third polarization beam splitter (302) perpendicular to the incident direction through the fourth quarter-wave plate (303) to the thirteenth mirror (304). The thirteenth mirror (304) reflects the light pulse back to the fourth quarter-wave plate (303), and the fourth quarter-wave plate (303) transmits the light pulse to the third polarization beam splitter (302) again. At the same time, the light pulse is output from another output end of the third polarization beam splitter (302) perpendicular to the incident direction, and is transmitted through the fifth quarter-wave plate (305) to the fourteenth mirror (306) and the first piezoelectric drive. After the actuator (307), the light pulse is reflected back to the fifth quarter-wave plate (305) by the fourteenth mirror (306). The fifth quarter-wave plate (305) then transmits the light pulse back to the third polarization beam splitter (302). The light pulse is output from the port of the third polarization beam splitter (302) parallel to the incident direction and transmitted to the fourth polarization beam splitter (309) via the seventh half-wave plate (308). The light pulse is then transmitted from the port of the fourth polarization beam splitter (309) perpendicular to the incident direction through the sixth quarter-wave plate (310) to the fifteenth mirror (311). The fifteenth mirror (311) reflects the light pulse back to the sixth quarter-wave plate (310), and the sixth quarter-wave plate (310) then transmits the light pulse back to the fourth polarization beam splitter. Beam splitter (309), and simultaneously, the light pulse from the port of the fourth polarization beam splitter (309) perpendicular to the incident direction passes through the seventh quarter-wave plate (312) to the sixteenth mirror (313) and the second piezoelectric driver (314). The light pulse is then reflected back to the seventh quarter-wave plate (312) by the sixteenth mirror (313), and the seventh quarter-wave plate (312) transmits the light pulse back to the fourth polarization beam splitter (309). The light pulse is output from the output end of the fourth polarization beam splitter (309) parallel to the incident direction, passes through the ninth convex lens (315) and the tenth convex lens (316), and is incident on the tilted chirped Bragg grating (324). The long-wavelength component of the light pulse is emitted from the tilted chirped Bragg grating (324). The light pulse is transmitted from the back to the seventeenth mirror (322), and after being reflected by the seventeenth mirror (322), it is transmitted to the second spatial light modulator (323). It is then incident from the second spatial light modulator (323) to the seventeenth mirror (322). The seventeenth mirror (322) reflects the light pulse back to the tilted chirped Bragg grating (324). The light pulse is fused with the short-wave component that was previously incident on the tilted chirped Bragg grating (324) and reflected from its front surface. It is then transmitted through the eighth half-wave plate (320) to the first thin-film polarizer (319). The light pulse is split into a main light pulse and a rejection light pulse by the first thin-film polarizer (319). The rejection light pulse is transmitted through the first thin-film polarizer (319) to the beam cutoff (318).The main optical pulse is reflected by the first thin-film polarizer (319) to the wedge beam splitter (325) and then output through the wedge beam splitter (325); The polarization pulse synthesis module has the following optical path structure: a light pulse is incident on the input end of the first beam splitter (4001), and is transmitted from the output end of the first beam splitter (4001) to the eighteenth reflector (4002). The light pulse is reflected by the eighteenth reflector (4002) to the nineteenth reflector (4003), and then reflected by the nineteenth reflector (4003) to the twentieth reflector (4004). The twentieth reflector (4004) reflects the light pulse to the twenty-first reflector (4005). The light pulse is reflected by the twenty-first reflector (4005) to the eleventh convex lens (4006). After passing through the eleventh convex lens (4006), the twelfth convex lens (4007), and the first dichroic mirror (4008), the light pulse... The light pulse transmitted through the first dichroic mirror (4008) is fused with the light pulse reflected by the fifty-fifth reflecting mirror (4105) to the first dichroic mirror (4008) and then reflected out. The fused light pulse is transmitted through the first dichroic mirror (4008) to the first KTiAsO4 crystal (4009), and then through the first KTiAsO4 crystal (4009) to the second dichroic mirror (4010). The short-wavelength light pulse reflected from the second dichroic mirror (4010) is transmitted to the twenty-second reflecting mirror (4101), and the long-wavelength light pulse transmitted from the second dichroic mirror (4010) is transmitted to the third dichroic mirror (4011). The light pulse reflected by the third dichroic mirror (4011) is transmitted to the twenty-third reflecting mirror (4102). The light pulse transmitted from the third dichroic mirror (4011) is incident on the twenty-fourth mirror (4012). The light pulse is reflected by the twenty-fourth mirror (4012) to the twenty-fifth mirror (4013), then reflected by the twenty-fifth mirror (4013) to the thirteenth convex lens (4014), then transmitted by the thirteenth convex lens (4014) to the fourteenth convex lens (4015), and after passing through the fourteenth convex lens (4015), it is incident on the twenty-sixth mirror (4016). The light pulse is reflected by the twenty-sixth mirror (4016) to the twenty-seventh mirror (4017), then reflected by the twenty-seventh mirror (4017) to the twenty-eighth mirror (4018), and finally reflected by the twenty-eighth mirror (4018) to the twenty-ninth mirror (4015). The light pulse is transmitted through the twenty-ninth mirror (4019) to the fourth dichroic mirror (4020), then through the fourth dichroic mirror (4020) to the second KTiAsO4 crystal (4021). The light pulse is transmitted through the second KTiAsO4 crystal (4021) to the fifth dichroic mirror (4022). The light pulse reflected from the fifth dichroic mirror (4022) is transmitted to the thirtieth mirror (4103). The light pulse transmitted from the fifth dichroic mirror (4022) is transmitted to the sixth dichroic mirror (4023). The light pulse reflected from the sixth dichroic mirror (4023) is transmitted to the thirty-first mirror (4104). The light pulse transmitted from the sixth dichroic mirror (4023) is incident on the fifteenth convex lens (4024).The light pulse is transmitted through the fifteenth convex lens (4024) to the sixteenth convex lens (4025), and then incident on the sixth grating (4027) through the sixteenth convex lens (4025). The sixth grating (4027) reflects the light pulse to the seventh grating (4028), which in turn reflects it to the first roof mirror (4029). After reaching the first roof mirror (4029), the light pulse is reflected back to the sixth grating (4027) along the input path. The sixth grating (4027) then transmits the light pulse to the thirty-second reflecting mirror (4026). The light pulse is reflected by the thirty-second reflecting mirror (4026) to the thirty-third reflecting mirror (4030), and then reflected by the thirty-third reflecting mirror (4030) to the thirty-fourth reflecting mirror (4031). The light pulse is reflected by the 34th reflector (4031) to the 35th reflector (4032), then by the 35th reflector (4032) to the 36th reflector (4033), and then by the 36th reflector (4033) to the knife-edge prism (4084). It is then transmitted from the other output of the first beam splitter (4001) to the 37th reflector (4034). The light pulse is reflected by the 37th reflector (4034) to the 38th reflector (4035), then by the 38th reflector (4035) to the 39th reflector (4036), then by the 39th reflector (4036) to the 40th reflector (4037), and finally by the 40th reflector (4037) to the 41st reflector (4034). 8) The light pulse is reflected by the forty-first reflecting mirror (4038) to the seventeenth convex lens (4039). After passing through the seventeenth convex lens (4039) and the eighteenth convex lens (4040), the light pulse is reflected by the eighteenth convex lens (4040) to the seventh dichroic mirror (4041). After being transmitted through the seventh dichroic mirror (4041), the light pulse merges with the light pulse reflected from the seventh dichroic mirror (4041) after being incident along the fifty-eighth reflecting mirror (4106). The merged light pulse is incident through the seventh dichroic mirror (4041) to the third KTiAsO4 crystal (4042). The light pulse is transmitted through the third KTiAsO4 crystal (4042) to the eighth dichroic mirror (4043). The light pulse reflected from the eighth dichroic mirror (4043) The light pulse is reflected by the forty-second mirror (4044). The light pulse transmitted from the eighth dichroic mirror (4043) is transmitted to the ninth dichroic mirror (4045). The light pulse reflected by the ninth dichroic mirror (4045) is transmitted to the forty-third mirror (4046). The light pulse output from the ninth dichroic mirror (4045) is incident on the forty-third mirror (4046). The light pulse transmitted by the ninth dichroic mirror (4045) is incident on the forty-fourth mirror (4047). The light pulse is reflected by the forty-fourth mirror (4047) to the forty-fifth mirror (4048). The light pulse is reflected by the forty-fifth mirror (4048) to the nineteenth convex lens (4049). After passing through the nineteenth convex lens (4049) and the twentieth convex lens (4050), the light pulse is reflected by the forty-fifth mirror (4048) to the nineteenth convex lens (4049).The light pulse is incident on the forty-sixth reflector (4051), reflected by the forty-seventh reflector (4052), then reflected by the forty-seventh reflector (4052) to the forty-eighth reflector (4053), then reflected by the forty-eighth reflector (4053) to the forty-nineth reflector (4054), then reflected by the forty-nineth reflector (4054) to the tenth dichroic mirror (4055), and transmitted out through the tenth dichroic mirror (4055). The light pulse merges with the light pulse reflected by the fifty-ninth reflector (4083) to the tenth dichroic mirror (4055) and then incident on the fourth KTiAsO4 crystal (4056). The light pulse passes through the fourth KTiAsO4 crystal (4056) and is then transmitted out through the tenth dichroic mirror (4056). The light pulse is transmitted to the eleventh dichroic mirror (4057), and the light pulse reflected from the eleventh dichroic mirror (4057) is transmitted to the fiftieth reflecting mirror (4058). The light pulse transmitted from the eleventh dichroic mirror (4057) is transmitted to the twelfth dichroic mirror (4059), and the light pulse reflected from the twelfth dichroic mirror (4059) is transmitted to the fifty-first reflecting mirror (4060). The light pulse transmitted from the twelfth dichroic mirror (4059) is incident on the twenty-first convex lens (4061), and the light pulse transmitted through the twenty-first convex lens (4061) is transmitted to the twenty-second convex lens (4062). The light pulse transmitted through the twenty-second convex lens (4062) is incident on the eighth grating (4063), and the eighth grating (4063) reflects the light pulse to the ninth grating (4064). On the 9th grating (4064), the light pulse is reflected to the second roof mirror (4065). After reaching the second roof mirror (4065), the light pulse is reflected back to the eighth grating (4063) along the input path. The eighth grating (4063) transmits the light pulse to the fifty-second mirror (4066). The light pulse is reflected by the fifty-second mirror (4066) to the fifty-third mirror (4067), and then by the fifty-third mirror (4067) to the fifty-fourth mirror (4068). The fifty-fourth mirror (4068) reflects the light pulse to the knife-edge prism (4084). The light pulse pumped by the laser (4069) is transmitted to the thirteenth dichroic mirror (4070). The light pulse reflected from the thirteenth dichroic mirror (4070) is transmitted to the thirteenth dichroic mirror (4070). The light pulse passes through the ninth half-wave plate (4071) and is incident on the second thin-film polarizer (4072). The parallel polarized light pulse transmitted through the second thin-film polarizer (4072) is incident on the fifty-fifth mirror (4105). The light pulse is reflected by the fifty-fifth mirror (4105) to the first dichroic mirror (4008). The vertically polarized light pulse reflected by the second thin-film polarizer (4072) is incident on the third thin-film polarizer (4073). The light pulse is reflected by the third thin-film polarizer (4073) and then transmitted through the tenth half-wave plate (4074) and the third erbium-doped fiber (4075) to the fifty-sixth mirror (4076). The light pulse is reflected by the fifty-sixth mirror (4076) to the fourth dichroic mirror (4020).The light pulse reflected by the fourth dichroic mirror (4020) merges with the light pulse that has been incident on the fourth dichroic mirror (4020) through the twenty-ninth mirror (4019) and then transmitted through the fourth dichroic mirror (4020). The merged light pulse is then incident on the second KTiAsO4 crystal (4021). The light pulse output from the thirteenth dichroic mirror (4070) is transmitted through the fifty-seventh mirror (4077) to the eleventh half-wave plate (4078). The light pulse is then incident on the fourth thin-film polarizer (4079) through the eleventh half-wave plate (4078). The parallel polarized light pulse transmitted through the fourth thin-film polarizer (4079) is then incident on the fifty-eighth mirror (4106). The light pulse is then reflected by the fifty-eighth mirror (4106) to the seventh dichroic mirror. A vertically polarized light pulse, reflected by the fourth thin-film polarizer (4079) and incident on the fifth thin-film polarizer (4080), is reflected by the fifth thin-film polarizer (4080) and then transmitted through the twelfth half-wave plate (4081) and the fourth erbium-doped fiber (4082) to the fifty-ninth mirror (4083). The light pulse is then reflected by the fifty-ninth mirror (4083) to the tenth dichroic mirror (4055). Finally, two light pulses with the same energy and pulse duration are incident on the knife-edge prism (4084) and transmitted through the knife-edge prism (4084) to the sixtieth mirror (4085). The light pulse is then reflected by the sixtieth mirror (4085) to the sixty-first mirror (4086) and then to the CaF... Two light pulses are fused through a CaF2 lens (4087). The fused light pulse is then incident on the fifth polarization beamsplitter (4088). The light pulse is output from the output end of the fifth polarization beamsplitter (4088) perpendicular to the incident direction. The light pulse is reflected by the sixty-second mirror (4089) to the sixty-third mirror (4090), then by the sixty-third mirror (4090) to the sixty-fourth mirror (4091), then by the sixty-fourth mirror (4091) to the sixty-fifth mirror (4092), and finally by the sixty-fifth mirror (4092) back to the fifth polarization beamsplitter (4088). The light pulse is then output from the output end of the fifth polarization beamsplitter (4088) parallel to the incident direction. The light pulse is then reflected by the fifth polarization beamsplitter (4088)... After being output from the beam splitter (4088), the light pulse is transmitted through the thirteenth half-wave plate (4093) to the sixth polarization beam splitter (4094). The light pulse is transmitted along the output end of the sixth polarization beam splitter (4094) perpendicular to the incident direction to the sixty-sixth mirror (4095). The light pulse is reflected by the sixty-sixth mirror (4095) to the sixty-seventh mirror (4096), then by the sixty-seventh mirror (4096) to the sixty-eighth mirror (4097), then by the sixty-eighth mirror (4097) to the sixty-ninth mirror (4098), and finally by the sixty-ninth mirror (4098) back to the sixth polarization beam splitter (4094). The light pulse is then output through another output end parallel to the incident direction of the sixth polarization beam splitter (4094).The optical pulse is transmitted via the sixth polarization beamsplitter to the fourteenth half-wave plate (4099), then via the fourteenth half-wave plate (4099) to the seventh polarization beamsplitter (4100), and finally output from the seventh polarization beamsplitter (4100). The spectral shaping module 5 has the following optical path structure: the light pulse is incident on the third beam splitter (502) after passing through the second beam splitter (501), and the light pulse is transmitted to the seventieth reflector (503) through the output end of the third beam splitter (502). After being reflected by the seventieth reflector (503), the light pulse is reflected sequentially by the seventy-first reflector (504), the seventy-second reflector (505), and the seventy-third reflector (506). The light pulse reflected by the seventy-third reflector (506) is incident on the tenth grating (512), the tenth grating (512) reflects the light pulse to the eleventh grating (513), the eleventh grating (513) reflects the light pulse to the seventy-fourth reflector (514), and the light pulse reaches the seventy-fourth reflector (514). The light pulse is reflected back to the tenth grating (512) after passing through mirror (514) along the input path. The tenth grating (512) transmits the light pulse to the seventy-fifth mirror (515). The light pulse is reflected by the seventy-fifth mirror (515) to the seventy-sixth mirror (517). It is then incident on the twenty-third convex lens (535) through the seventy-sixth mirror (517). The light pulse output from the other output end of the third beam splitter (502) is transmitted to the seventy-seventh mirror (507). After being reflected by the seventy-seventh mirror (507), the light pulse passes sequentially through the seventy-eighth mirror (508), the seventy-ninth mirror (509), the eightieth mirror (510), and the eighty-first mirror (511). The light pulse reflected by the eighty-first mirror (511) is... The light pulse and the light pulse reflected by the seventy-third mirror (506) enter the tenth grating (512) in parallel. Following the incident path of the light pulse incident from the seventy-third mirror (506) to the tenth grating (512) as described above, the light pulse passes through the tenth grating (512), the eleventh grating (513), and the seventy-fourth mirror (514) in sequence, and then returns to the tenth grating (512) along the input path. The light pulse is transmitted from the tenth grating (512) to the seventy-fifth mirror (515), and the light pulse is reflected by the seventy-fifth mirror (515) to the one hundred and third mirror (516). The light pulse is then incident on the twenty-third convex lens (535) through the one hundred and third mirror (516), and the light pulse output from the other output end of the second beam splitter (501) is... The light pulse is transmitted to the 104th reflector (518), and then to the fourth beam splitter (519). The light pulse output from the fourth beam splitter (519) is transmitted to the 105th reflector (520). After being reflected by the 105th reflector (520), the light pulse is reflected sequentially by the 82nd reflector (521), the 83rd reflector (522), and the 84th reflector (523). The light pulse reflected by the 84th reflector (523) is incident on the 12th grating (529). The 12th grating (529) reflects the light pulse to the 13th grating (530), and the 13th grating (530) reflects the light pulse onto the 85th reflector (531).After the light pulse reaches the 85th reflector (531), it is reflected back to the 12th grating (529) along the input path. The 12th grating (529) transmits the light pulse to the 86th reflector (532). The light pulse is reflected by the 86th reflector (532) to the 87th reflector (534). It is then incident on the 23rd convex lens (535) through the 87th reflector (534). The light pulse output from the other output end of the fourth beam splitter (519) is transmitted to the 88th reflector (524). After being reflected by the 88th reflector (524), the light pulse passes sequentially through the 89th reflector (525), the 90th reflector (526), ​​the 91st reflector (527), and the 92nd reflector (528). The light pulse reflected by the 92nd reflector (528) enters the 12th grating (529) in parallel with the light pulse reflected by the 84th reflector (523). As described above, the incident path of the light pulse from the 84th reflector (523) to the 12th grating (529) passes sequentially through the 12th grating (529), the 13th grating (530), and the 85th reflector (531), and returns to the 12th grating (529) along the input path. The light pulse is transmitted from the 12th grating (529) to the 86th reflector (532), and is reflected by the 86th reflector (532) to the 93rd reflector (533). It is then incident on the 23rd convex lens (535) through the 93rd reflector (533). The four light pulses, which pass through the 103rd reflector (516), the 76th reflector (517), the 93rd reflector (533), and the 87th reflector (534), enter the 23rd convex lens (535) in parallel. The light pulse is focused and fused by the 23rd convex lens (535), and the fused light pulse is reflected by the 94th reflector (536) to the 5th beam splitter (537). The light pulse from (537) is output to the sixth beam splitter (538), and the light pulse is output to the first adjustable aperture (539) after passing through the sixth beam splitter (538). The light pulse passes through the first adjustable aperture (539), the variable optical density adjuster (540), the twenty-fourth convex lens (541), the sapphire crystal (542), and the twenty-fifth convex lens (543) before being incident on the ninety-fifth reflector (544). The light pulse is reflected by the ninety-fifth reflector (544) to the fourteenth dichroic mirror (552). The light pulse is transmitted through the fourteenth dichroic mirror (552) to the first filter (553). The light pulse output from the other end of the sixth beam splitter (538) is incident on the second adjustable aperture (545). The light pulse is incident on the ninety-sixth reflector (546) after passing through the second adjustable aperture (545). After being reflected by the ninety-sixth reflector (546), the ninety-seventh reflector (547) and the ninety-eighth reflector (548) in sequence, the light pulse is reflected to the twenty-eighth convex lens (549).After passing through the twenty-eighth convex lens (549), the light pulse passes sequentially through the first BBO crystal (550) and SF11 glass (551) before being incident on the fourteenth dichroic mirror (552). The light pulse is reflected by the fourteenth dichroic mirror (552) and merges with the beam that has been reflected by the ninety-fifth reflector (544) and transmitted to the fourteenth dichroic mirror (552). The merged beam passes sequentially through the first filter (553), the second BBO crystal (554), the twenty-sixth convex lens (555), and the second filter (556), and is then transmitted through the second filter (556) to the fifteenth dichroic mirror (557). The light pulse is transmitted through the fifteenth dichroic mirror (557) to the third BBO crystal (564). The light pulse output from the other output end of the fifth beam splitter (537) passes through... The third adjustable aperture (558) is incident on the ninety-ninth reflector (559). The light pulse is reflected by the ninety-ninth reflector (559) to the hundredth reflector (560), and then reflected by the hundredth reflector (560) to the hundredth and one hundredth reflector (561). After being reflected by the hundredth and one hundredth reflector (561), the light pulse passes sequentially through the twenty-seventh convex lens (562) and the fifteenth half-wave plate (563). The light pulse is then transmitted through the fifteenth half-wave plate (563) to the fifteenth dichroic mirror (557), and reflected by the fifteenth dichroic mirror. It then merges with the light pulse transmitted through the fifteenth dichroic mirror (557). The merged light pulse is transmitted to the third BBO crystal (564), and then transmitted through the third BBO crystal (564) to the one hundred and twoth reflector (565), where it is output.

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