A high power spectrum wide tunable ultra-short pulse generation system

Abstract

The application discloses a high-power spectrum wide tunable ultra-short pulse generation system, and belongs to the technical field of optoelectronic devices.The structure of the application is as follows: the output end of a seed pulse source (1) is connected with the input end of a first-stage power pre-amplification module (2), the output end of the first-stage power pre-amplification module (2) is connected with the input end of a pulse time-domain separation module (3), the output end of the pulse time-domain separation module (3) is connected with the input end of a Fourier time-space transformation shaping module (4), the output end of the Fourier time-space transformation shaping module (4) is connected with the input end of a second-stage power amplification module (5), the output end of the second-stage power amplification module (5) is connected with the input end of a polarization pulse synthesis module (6), and the output end of the polarization pulse synthesis module (6) is connected with the input end of a spectrum expansion module (7). The application can output ultra-short laser pulses, and has the advantages of high pulse power, spectrum tunability and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of optoelectronic devices, and particularly relates to a high-power spectrum-wide tunable ultra-short pulse generation system. BACKGROUND

[0002] Tunable fiber lasers have been widely used in optical networks and systems, and are promoting the development of optical networks. The use of tunable fiber lasers can improve the capacity and efficiency of long-haul and metropolitan area networks, expand the flexibility of optical networks, improve the functionality and simplify the optical networks, rapidly upgrade the optical networks, improve the network service quality, and reduce the network construction cost. In addition, tunable fiber lasers can also be used in the fields of atmospheric monitoring, fiber sensing, measurement, optical data storage, instruments and medical treatment. Among them, the tunable fiber laser with high power and accurate wavelength output has been used in a time division multiplexing fiber grating sensing system, and can accurately measure the wavelength displacement of the fiber grating sensing with a large signal-to-noise ratio. The tunable fiber laser with a large tuning range and high output power has also developed rapidly and is widely used in large-capacity, long-distance optical fiber communication systems and DWDM systems.

[0003] In most cases, tunable ultra-short pulses can be realized by using solid-state lasers or dye lasers, but their development is restricted by the disadvantages of large size, complex structure, narrow tunable range, etc. In addition, compared with tunable fiber lasers, the stability and spectral purity of the laser output by tunable semiconductor lasers are poor, and the tuning range is much smaller than that of fiber lasers. Tunable semiconductor lasers also have the disadvantages of low optical output power, narrow gain bandwidth, high threshold and relative intensity noise, high line width, unstable tuning structure, low pump slope efficiency, etc.

[0004] Due to the influence of nonlinear effects such as stimulated Brillouin scattering effect, it is difficult to improve the power of fiber lasers, so effective means must be used to effectively suppress stimulated Brillouin scattering. In experiments, the method of using large-mode-area fibers is often used to realize high-power output of lasers, but since the large-mode-area fiber does not meet the single-mode condition, the quality of the output light beam is reduced.

[0005] In summary, the existing systems capable of generating high-power spectrum-wide tunable ultra-short pulses all have inherent shortcomings and need to be further improved. SUMMARY

[0006] In order to overcome the shortcomings of the traditional system, such as low pulse power and narrow tunable range, the present application provides a high-power spectrum-wide tunable ultra-short pulse generation system. The power of the pulse is amplified by two-stage power pre-amplification, and the pulse width is compressed and nonlinear frequency conversion is performed by a spectrum expansion module to obtain tunable ultra-short pulses in the range of 1200-2500 nm, thereby obtaining high-power spectrum-wide tunable ultra-short pulses.

[0007] The application achieves the above-mentioned purpose by the following technical scheme:

[0008] A high-power spectrum wide tunable ultra-short pulse generation system, which comprises a seed pulse source 1, a first power pre-amplification module 2, a pulse time domain separation module 3, a Fourier time-space transformation shaping module 4, a second power amplification module 5, a polarization pulse synthesis module 6 and a spectrum expansion module 7.

[0009] The seed pulse source 1 comprises a first pump source 101, a first pump coupler 102, a first collimator 104, a first polarization beam splitter 105, a first free-space isolator 106, a first half-wave plate 107, a first filter 108, a first quarter-wave plate 109, a second collimator 110, a second pump coupler 112, a second pump source 111, a second doped ytterbium fiber 113, a third collimator 114, a first grating 115, a second grating 116, a photonic crystal fiber 117, a second quarter-wave plate 118, a second half-wave plate 119, a second polarization beam splitter 120, a second free-space isolator 121, a third half-wave plate 122, a second filter 123 and a fourth collimator 124.

[0010] The first power pre-amplification module 2 has the following optical path structure: the optical pulse is transmitted to the third grating 202 through the first mirror 201, the third grating 202 transmits the optical pulse to the second mirror 203, and then the optical pulse is reflected to the third mirror 204, the third mirror 204 reflects the optical pulse back to the third grating 202, the pulse output by the third grating 202 is transmitted to the fourth mirror 206 through the first convex lens 205, and then the pulse is reflected back to the third grating 202 through the first convex lens 205, the optical pulse is transmitted to the second mirror 203 through the third grating 202, the second mirror 203 reflects the optical pulse and then the optical pulse is reflected to the third grating 202 through the third mirror 204, the optical pulse output by the third grating 202 is incident to the first wave prism 207 and then the optical pulse is reflected back to the third grating 202 through the first wave prism 207, the optical pulse is transmitted to the second mirror 203 again through the third grating 202, the third mirror 204, the third grating 202, the first convex lens 205, the fourth mirror 206, and then the optical pulse is reflected back to the third grating 202 after multiple reflections, the third grating 202 transmits the optical pulse to the second convex lens 208, the optical pulse is incident to the fifth mirror 213 through the second convex lens 208, the acousto-optic modulator 209, the third convex lens 210, the first isolator 211, and the fourth half-wave plate 212, the optical pulse is reflected to the sixth mirror 214 through the fifth mirror 213, and then the optical pulse is incident to the fourth convex lens 215, the optical pulse is incident to the seventh mirror 220 through the fourth convex lens 215, the fifth collimator 216, the third ytterbium-doped fiber 217, the sixth collimator 218, and the fifth convex lens 219. The pump light generated by the first photodiode 222 is incident to the seventh mirror 220 through the seventh collimator 223 and the sixth convex lens 224, and then the pump light is fused with the optical pulse previously incident to the seventh mirror 220. The fused optical pulse is reflected to the eighth mirror 221 through the seventh mirror 220, the eighth mirror 221 reflects the optical pulse to the fifth half-wave plate 225, and then the optical pulse is transmitted to the third quarter-wave plate 226 through the fifth half-wave plate 225, and finally the optical pulse is output by the third quarter-wave plate 226;

[0011] The pulse time domain separation module 3 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, the light pulse is output from the output end perpendicular to the incident direction of the third polarization beam splitter 302, transmitted to the ninth mirror 304 through the fourth quarter-wave plate 303, the ninth mirror 304 reflects the light pulse back to the fourth quarter-wave plate 303, the fourth quarter-wave plate 303 transmits the light pulse to the third polarization beam splitter 302 again, while the light pulse is transmitted to the tenth mirror 306 and the first piezoelectric driver 307 from the other output end of the third polarization beam splitter 302 which is perpendicular to the incident direction through the fifth quarter-wave plate 305, the tenth mirror 306 reflects the light pulse back to the fifth quarter-wave plate 305, the fifth quarter-wave plate 305 transmits the light pulse back to the third polarization beam splitter 302 again, the light pulse is output from the port parallel to the incident direction of the third polarization beam splitter 302, transmitted to the fourth polarization beam splitter 309 through the seventh half-wave plate 308, the light pulse is transmitted to the eleventh mirror 311 from the port perpendicular to the incident direction of the fourth polarization beam splitter 309 through the sixth quarter-wave plate 310, the eleventh mirror 311 reflects the light pulse back to the sixth quarter-wave plate 310, the sixth quarter-wave plate 310 transmits the light pulse back to the fourth polarization beam splitter 309 again, while the light pulse is transmitted to the twelfth mirror 313 and the second piezoelectric driver 314 from the other port perpendicular to the incident direction of the fourth polarization beam splitter 309 through the seventh quarter-wave plate 312, the twelfth mirror 313 reflects the light pulse back to the seventh quarter-wave plate 312, the seventh quarter-wave plate 312 transmits the light pulse to the fourth polarization beam splitter 309 again, and the light pulse is output from the output end parallel to the incident direction of the fourth polarization beam splitter 309;

[0012] The Fourier space-time transformation shaping module 4 has the following optical path structure: the optical pulse is transmitted to the fourth grating 401, the optical pulse is reflected to the concave mirror 402 through the fourth grating 401, the concave mirror 402 reflects the optical pulse to the thirteenth mirror 403, the optical pulse is reflected to the concave mirror 402 through the thirteenth mirror 403, and then transmitted to the fourth grating 401 through the concave mirror 402, the optical pulse is transmitted again through the concave mirror 402 and the thirteenth mirror 403 after the fourth grating 401, and the optical pulse returns to the fourth grating 401 after multiple reflections, the fourth grating 401 reflects the optical pulse to the fourteenth mirror 404, the optical pulse is transmitted to the fifteenth mirror 405 through the fourteenth mirror 404, transmitted to the sixteenth mirror 406 through the fifteenth mirror 405, and then transmitted to the seventeenth mirror 407, the optical pulse is sequentially reflected by seven mirrors for spectral shaping: the optical pulse is sequentially reflected by the eighteenth mirror 408, the nineteenth mirror 409, the twentieth mirror 410, the twenty-first mirror 411, the twenty-second mirror 412, the twenty-third mirror 413 and the twenty-fourth mirror 414, and then the optical pulse is incident on the twenty-fifth mirror 415, and the output of the twenty-fifth mirror 415 is the output of the polarization pulse module;

[0013] The secondary power amplification module 5 has the following optical path structure: the optical pulse is incident to the input end of the first beam splitter 501, transmitted from the output end of the first beam splitter 501 to the twenty-sixth mirror 502, reflected by the twenty-sixth mirror 502 to the twenty-seventh mirror 503, reflected by the twenty-seventh mirror 503 to the twenty-eighth mirror 504, reflected by the twenty-eighth mirror 504 to the twenty-ninth mirror 505, reflected by the twenty-ninth mirror 505 to the seventh convex lens 506, transmitted through the seventh convex lens 506, the eighth convex lens 507 and the first dichroic mirror 508, and outputted by the first dichroic mirror 508, and the optical pulse is fused with the optical pulse reflected by the sixty-third mirror 592 to the first dichroic mirror 508, transmitted by the first dichroic mirror 508 to the first KTiAsO4 crystal 509, transmitted by the first KTiAsO4 crystal 509 to the second dichroic mirror 510, the short-wavelength optical pulse reflected by the second dichroic mirror 510 is transmitted to the thirtieth mirror 588, the long-wavelength optical pulse transmitted by the second dichroic mirror 510 is transmitted to the third dichroic mirror 511, the optical pulse reflected by the third dichroic mirror 511 is transmitted to the thirty-first mirror 589, the optical pulse transmitted by the third dichroic mirror 511 is incident to the thirty-second mirror 512, reflected by the thirty-second mirror 512 to the thirty-third mirror 513, reflected by the thirty-third mirror 513 to the ninth convex lens 514, transmitted by the ninth convex lens 514 to the tenth convex lens 515, incident to the thirty-fourth mirror 516 after passing through the tenth convex lens 515, reflected by the thirty-fourth mirror 516 to the thirty-fifth mirror 517, reflected by the thirty-fifth mirror 517 to the thirty-sixth mirror 518, reflected by the thirty-sixth mirror 518 to the thirty-seventh mirror 519, transmitted by the thirty-seventh mirror 519 to the fourth dichroic mirror 520, transmitted by the fourth dichroic mirror 520 to the second KTiAsO4 crystal 521, transmitted by the second KTiAsO4 crystal 521 to the fifth dichroic mirror 522, the optical pulse reflected by the fifth dichroic mirror 522 is transmitted to the thirty-eighth mirror 590, the optical pulse transmitted by the fifth dichroic mirror 522 is transmitted to the sixth dichroic mirror 523, the optical pulse reflected by the sixth dichroic mirror 523 is transmitted to the thirty-ninth mirror 591, the optical pulse transmitted by the sixth dichroic mirror 523 is incident to the eleventh convex lens 524, transmitted by the eleventh convex lens 524 to the twelfth convex lens 525, incident to the fifth grating 527 after passing through the twelfth convex lens 525, reflected by the fifth grating 527 to the sixth grating 528, reflected by the sixth grating 528 to the first roof mirror 529, reflected by the first roof mirror 529 to the fifth grating 527 along the input route, transmitted by the fifth grating 527 to the fortieth mirror 526, reflected by the fortieth mirror 526 to the forty-first mirror 530,transmitted through the thirteenth convex lens 539, the fourteenth convex lens 540, and is reflected to the seventh dichroic mirror 541. The light pulse transmitted through the seventh dichroic mirror 541 is combined with the light pulse reflected from the sixth sixty-seventh mirror 593 to the seventh dichroic mirror 541, and the combined light pulse is incident to the third KTiAs04crystal 542 through the seventh dichroic mirror 541. The light pulse transmitted through the third KTiAs04crystal 542 is reflected from the eighth dichroic mirror 543 to the fiftieth mirror 544, and the light pulse transmitted through the eighth dichroic mirror 543 is transmitted to the ninth dichroic mirror 545. The light pulse reflected from the ninth dichroic mirror 545 is transmitted to the fifty-first mirror 546, and the light pulse transmitted through the ninth dichroic mirror 545 is incident to the fifty-second mirror 547. The light pulse reflected from the fifty-second mirror 547 is reflected to the fifty-third mirror 548, and the light pulse transmitted through the fifty-third mirror 548 is incident to the fifteenth convex lens 549, the sixteenth convex lens 550, and the fifty-fourth mirror 551. The light pulse reflected from the fifty-fourth mirror 551 is reflected to the fifty-fifth mirror 552, and the light pulse transmitted through the fifty-fifth mirror 552 is reflected to the fifty-sixth mirror 553. The light pulse transmitted through the fifty-sixth mirror 553 is reflected to the fifty-seventh mirror 554, and the light pulse transmitted through the fifty-seventh mirror 554 is transmitted to and output from the tenth dichroic mirror 555. The output light pulse is combined with the light pulse reflected from the sixty-seventh mirror 583 to the tenth dichroic mirror 555, and the combined light pulse is incident to the fourth KTiAs04crystal 556. The light pulse transmitted through the fourth KTiAs04crystal 556 is transmitted to the eleventh dichroic mirror 557. The light pulse reflected from the eleventh dichroic mirror 557 is transmitted to the fifty-eighth mirror 558, and the light pulse transmitted through the eleventh dichroic mirror 557 is transmitted to the twelfth dichroic mirror 559. The light pulse reflected from the twelfth dichroic mirror 559 is transmitted to the fifty-ninth mirror 560, and the light pulse transmitted through the twelfth dichroic mirror 559 is incident to the seventeenth convex lens 561, the eighteenth convex lens 562, and the seventh grating 563. The light pulse transmitted through the seventh grating 563 is reflected to the sixtieth mirror 564, and the light pulse transmitted through the sixtieth mirror 564 is transmitted to the sixty-first mirror 565. The light pulse transmitted through the sixty-first mirror 565 is transmitted to the sixty-second mirror 566, and the light pulse transmitted through the sixty-second mirror 566 is transmitted to the sixty-third mirror 567. The light pulse transmitted through the sixty-third mirror 567 is transmitted to the sixty-fourth mirror 568, and the light pulse transmitted through the sixty-fourth mirror 568 is transmitted to the sixty-fifth mirror 569. The light pulse transmitted through the sixty-fifth mirror 569 is transmitted to the sixty-sixth mirror 570, and the light pulse transmitted through the sixty-sixth mirror 570 is transmitted to the sixty-seventh mirror 571. The light pulse transmitted through the sixty-seventh mirror 571 is transmitted to the sixty-eighth mirror 572, and the light pulse transmitted through the sixty-eighth mirror 572 is transmitted to the sixty-ninth mirror 573. The light pulse transmitted through the sixty-ninth mirror 573 is transmitted to the seventieth mirror 574, and the light pulse transmitted through the seventieth mirror 574 is transmitted to the seventy-first mirror 575. The light pulse transmitted through the seventy-first mirror 575 is transmitted to the seventy-second mirror 576, and the light pulse transmitted through the seventy-second mirror 576 is transmitted to the seventy-third mirror 577. The light pulse transmitted through the seventy-third mirror 577 is transmitted to the seventy-fourth mirror 578, and the light pulse transmitted through the seventy-fourth mirror 578 is transmitted to the seventy-fifth mirror 579. The light pulse transmitted through the seventy-fifth mirror 579 is transmitted to the seventy-sixth mirror 580, and the light pulse transmitted through the seventy-sixth mirror 580 is transmitted to the seventy-seventh mirror 581. The light pulse transmitted through the seventy-seventh mirror 581 is transmitted to the seventy-eighth mirror 582, and the light pulse transmitted through the seventy-eighth mirror 582 is transmitted to the seventh color wheel 581.The seventh grating 563 reflects the light pulse to the eighth grating 564, the eighth grating 564 reflects the light pulse to the second roof mirror 565, the light pulse reaches the second roof mirror 565 and is reflected back to the seventh grating 563 along the input route, the seventh grating 563 transmits the light pulse to the sixtieth reflecting mirror 566, the light pulse is reflected by the sixtieth reflecting mirror 566 to the sixty-first reflecting mirror 567, reflected by the sixty-first reflecting mirror 567 to the sixty-second reflecting mirror 568, reflected by the sixty-second reflecting mirror 568 to the knife-edge prism 584, the light pulse pumped by the laser 569 is transmitted to the thirteenth dichroic mirror 570, the light pulse reflected by the thirteenth dichroic mirror 570 is incident to the first thin-film polarizer 572 through the eighth half-wave plate 571, the parallel polarized light pulse transmitted and output by the first thin-film polarizer 572 is incident to the sixty-third reflecting mirror 592, the light pulse is reflected by the sixty-third reflecting mirror 592 to the first dichroic mirror 508, the perpendicular polarized light pulse reflected by the first thin-film polarizer 572 is incident to the second thin-film polarizer 573, the light pulse is reflected by the second thin-film polarizer 573 and transmitted to the sixty-fourth reflecting mirror 576 through the ninth half-wave plate 574 and the fourth Yb-doped fiber 575, the light pulse is reflected by the sixty-fourth reflecting mirror 576 to the fourth dichroic mirror 520, the light pulse reflected by the fourth dichroic mirror 520 is fused with the light pulse transmitted and output by the fourth dichroic mirror 520 after being incident to the fourth dichroic mirror 520 through the thirty-seventh reflecting mirror 519, the fused light pulse is incident to the second KTiAsO4crystal 521, the light pulse output by the thirteenth dichroic mirror 570 is transmitted to the tenth half-wave plate 578 through the sixty-fifth reflecting mirror 577, the light pulse is incident to the third thin-film polarizer 579 through the tenth half-wave plate 578, the parallel polarized light pulse transmitted and output by the third thin-film polarizer 579 is incident to the sixty-sixth reflecting mirror 593, the light pulse is reflected by the sixty-sixth reflecting mirror 593 to the seventh dichroic mirror 541, the perpendicular polarized light pulse reflected by the third thin-film polarizer 579 is incident to the fourth thin-film polarizer 580, the light pulse is reflected by the fourth thin-film polarizer 580 and transmitted to the sixty-seventh reflecting mirror 583 through the eleventh half-wave plate 581 and the fifth Yb-doped fiber 582, the light pulse is reflected by the sixty-seventh reflecting mirror 583 to the tenth dichroic mirror 555, the two same light pulses finally incident to the knife-edge prism 584 are transmitted to the sixty-eighth reflecting mirror 585 through the knife-edge prism 584, the light pulse is reflected by the sixty-eighth reflecting mirror 585 to the sixty-ninth reflecting mirror 586 to the CaF2lens 587, the two light pulses are fused and output after passing through the CaF2lens 587;

[0014] The polarization pulse synthesis module 6 has the following optical path structure: incident to the fifth polarization beam splitter 601, the output end of the fifth polarization beam splitter 601 is perpendicular to the incident direction of the output end of the light pulse, the light pulse is reflected by the seventh mirror 602 to the seventy-first mirror 603, reflected by the seventy-first mirror 603 to the seventy-second mirror 604, reflected by the seventy-second mirror 604 to the seventy-third mirror 605, reflected by the seventy-third mirror 605 to the fifth polarization beam splitter 601, and then output by the output end parallel to the incident direction of the fifth polarization beam splitter 601, the light pulse is transmitted to the sixth polarization beam splitter 607 through the twelfth half-wave plate 606 after output by the fifth polarization beam splitter 601, the light pulse is transmitted to the seventy-fourth mirror 608 along the output end perpendicular to the incident direction of the sixth polarization beam splitter 607, the light pulse is reflected by the seventy-fourth mirror 608 to the seventy-fifth mirror 609, reflected by the seventy-fifth mirror 609 to the seventy-sixth mirror 610, reflected by the seventy-sixth mirror 610 to the seventy-seventh mirror 611, reflected by the seventy-seventh mirror 611 to the sixth polarization beam splitter 607, and then output by the other output end parallel to the incident direction of the sixth polarization beam splitter 607, the light pulse is transmitted to the thirteenth half-wave plate 612 through the sixth polarization beam splitter 607, transmitted to the seventh polarization beam splitter 613 through the thirteenth half-wave plate 612, and finally output by the seventh polarization beam splitter 613;

[0015] The spectral expansion module 7 has the following optical path structure: the light pulse is incident on the ninth grating 703 through the third roof mirror 701 and the fourteenth half-wave plate 702, the light pulse output by the ninth grating 703 is transmitted to the seventy-eighth reflecting mirror 705 through the nineteenth convex lens 704, the light pulse is reflected by the seventy-eighth reflecting mirror 705 to the nineteenth convex lens 704 and then returns to the ninth grating 703, the light pulse is transmitted to the seventy-ninth reflecting mirror 706 through the ninth grating 703, is reflected by the seventy-ninth reflecting mirror 706 to the eightieth reflecting mirror 707, is transmitted to the ninth grating 703 through the seventy-ninth reflecting mirror 706, is reflected by the seventy-ninth reflecting mirror 706 to the eightieth reflecting mirror 707 along the original path, is transmitted to the ninth grating 703, is reflected by the ninth grating 703 along the original path after being transmitted to the second Wolter prism 708, the light pulse passes through the ninth grating 703 again, the nineteenth convex lens 704, the seventy-eighth reflecting mirror 705, the seventy-ninth reflecting mirror 706, the eightieth reflecting mirror 707, the ninth grating 703 and the second Wolter prism 708, and returns to the ninth grating 703 after multiple reflections, the ninth grating 703 transmits the light pulse to the second beam splitter 709, the light pulse output through the second beam splitter 709 is output to the third beam splitter 710, the light pulse is output to the first adjustable light diaphragm 711 through the third beam splitter 710, is incident on the eighty-first reflecting mirror 716 through the first adjustable light diaphragm 711, the variable optical density adjuster 712, the twentieth convex lens 713, the sapphire crystal 714 and the twenty-first convex lens 715, is reflected by the eighty-first reflecting mirror 716 to the fourteenth dichroic mirror 724 and is transmitted and output through the fourteenth dichroic mirror 724 to be transmitted to the third filter 725, the light pulse output from the other end of the third beam splitter 710 is incident on the second adjustable light diaphragm 717, is incident on the eighty-second reflecting mirror 718 through the second adjustable light diaphragm 717, and is reflected by the eighty-second reflecting mirror 718, the eighty-third reflecting mirror 719 and the eighty-fourth reflecting mirror 720 in sequence, is reflected to the twenty-second convex lens 721, and is transmitted through the first BBO crystal 722 and the SF11 glass 723 in sequence after being transmitted through the twenty-second convex lens 721, is incident on the fourteenth dichroic mirror 724, is reflected by the fourteenth dichroic mirror 724 and is fused with the light beam which is transmitted and output after being reflected by the eighty-first reflecting mirror 716 to the fourteenth dichroic mirror 724, the fused light beam is transmitted to the fourth filter 728 in sequence after being transmitted through the third filter 725, the second BBO crystal 726, the twenty-third convex lens 727 and the fourth filter 728, is transmitted to the fifteenth dichroic mirror 734 through the fourth filter 728, is transmitted to the third BBO crystal 735 through the fifteenth dichroic mirror 734, the light pulse output from the other output end of the second beam splitter 709 is incident on the eighty-fifth reflecting mirror 729 through the third adjustable light diaphragm 736, is reflected by the eighty-fifth reflecting mirror 729 to the eighty-sixth reflecting mirror 730, is reflected by the eighty-sixth reflecting mirror 730 to the eighty-seventh reflecting mirror 731,The light pulse is reflected by the eighty-seventh mirror 731, and then passes through the twenty-fourth convex lens 732 and the fifteenth half-wave plate 733 in sequence, the light pulse is transmitted to the fifteenth dichroic mirror 734 through the fifteenth half-wave plate 733, and is reflected by the fifteenth dichroic mirror 734, and is fused with the light pulse transmitted and output by the fifteenth dichroic mirror 734, and the fused light pulse is transmitted to the third BBO crystal 735, and the light pulse is output by the third BBO crystal 735.

[0016] Advantages:

[0017] 1. The grating is used for designing pulse integration structure to realize pulse multiplexing, and the pulse power of the system is effectively improved.

[0018] 2. The double-channel pre-amplification structure is designed by using the erbium-doped optical fiber and the rod-shaped optical fiber, and the pulse power in the system is further improved.

[0019] 3. The spatial optical lens is used to design the four-time pulse spectrum filtering structure to compress the pulse width, and realize the output of the ultrashort pulse.

[0020] 4. The nonlinear crystal is used to construct the center wavelength shift structure to realize the nonlinear frequency conversion, so that the output spectrum of the system can be tuned in the range of 1200-2500 nm. DETAILED DESCRIPTION

[0021] Figure 1 It is the overall structure block diagram of the application.

[0022] Figure 2 It is a seed pulse source optical path diagram used in the application.

[0023] Figure 3 It is a first power pre-amplification module optical path diagram used in the application.

[0024] Figure 4 It is a pulse time domain separation module optical path diagram used in the application.

[0025] Figure 5 It is a Fourier space-time transformation shaping module optical path diagram used in the application.

[0026] Figure 6 It is a second power amplification module optical path diagram used in the application.

[0027] Figure 7 It is a polarization pulse synthesis module optical path diagram used in the application.

[0028] Figure 8 It is a spectrum expansion module optical path diagram used in the application. DETAILED DESCRIPTION

[0029] The working principle of the present application is further explained below in conjunction with the drawings, and it should be understood that the marked components in each embodiment are preferred parameters of each embodiment, and are not a limitation on the scope of protection.

[0030] Overall structure of the present application

[0031] The overall structure of the present application has the output end of the seed pulse source 1 connected to the input end of the first-stage power pre-amplification module 2, the output end of the first-stage power pre-amplification module 2 connected to the input end of the pulse time-domain separation module 3, the output end of the pulse time-domain separation module 3 connected to the input end of the Fourier time-space transformation shaping module 4, the output end of the Fourier time-space transformation shaping module 4 connected to the input end of the second-stage power pre-amplification module 5, the output end of the second-stage power pre-amplification module 5 connected to the input end of the polarization pulse synthesis module 6, and the output end of the polarization pulse synthesis module 6 connected to the input end of the spectrum expansion module 7.

[0032] Seed pulse source

[0033] The seed pulse source 1 is structured as follows: the first pump source 101 (LC962U pump source of OCLARO company, center wavelength 980 nm, maximum single-mode output optical power 750 mW) is connected with the 980 nm end of the first pump coupler 102, the 1060 nm end of the first pump coupler 102 (PASA-YD-30 / 250-7x1 of Nufern company) is connected with the first collimator 104 (M011 collimator of WT&T company) through the first ytterbium-doped fiber 103 (PM-YDF-HI ytterbium-doped fiber of Nufern company), the light pulse output by the first collimator 104 is incident to the first polarization beam splitter 105 (QTFBC-1216 polarization beam splitter of Kongtum company), the light pulse output by the first polarization beam splitter 105 passes through the first free-space isolator 106 (IO-5-1550-HP of Thorlabs), the first half-wave plate 107 (WPZ2310-248 half-wave plate of Hengyangan Optical), the first optical filter 108 (HANF-D25-006T:25% of Hengyangan Optical), the first quarter-wave plate 109 (WPZ4310-248 quarter-wave plate of Hengyangan Optical), the second collimator 110 (M011 collimator of WT&T company), and is connected with the common end of the second pump coupler 112 (PASA-YD-30 / 250-7x1 of Nufern company), the 980 nm end of the second pump coupler 112 is connected with the second pump source 111 (LC962U pump source of OCLARO company, center wavelength 980 nm, maximum single-mode output optical power 750 mW), the 1060 nm end of the second pump coupler 112 is connected with the input end of the third collimator 114 (M011 collimator of WT&T company) through the second ytterbium-doped fiber 113 (PM-YDF-HI ytterbium-doped fiber of Nufern company), the light pulse output by the third collimator 114 is incident to the first grating 115, the light pulse is reflected to the second grating 116 (LSFSG-1000-4085-94 grating of LightSmyth company) by the first grating 115 (LSFSG-1000-4085-94 grating of LightSmyth company), and is reflected to the photonic crystal fiber 117 (AeroGAIN-BASE-1.1), the light pulse passes through the photonic crystal fiber 117, the second quarter wave plate 118 (Hengyang Optical WPZ4310-248 quarter wave plate), the second half wave plate 119 (Hengyang Optical WPZ2310-248 half wave plate), the second polarization beam splitter 120 (Kongtum QTFBC-1216 polarization beam splitter), the second free space isolator 121 (Thorlabs IO-5-1550-HP), the third half wave plate 122 (Hengyang Optical WPZ2310-248 half wave plate), and then the light pulse is incident on the second filter 123 through the third half wave plate 122, the light pulse is transmitted to the fourth collimator 124 (WT&T M011 collimator) through the second filter 123 (Hengyang Optical HANF-D25-006 T:25%), the fourth collimator 124 is connected with the common end of the first pump coupler 102, and finally is output by the output end perpendicular to the incident direction of the second polarization beam splitter 120. The above structure combines the pulse integration structure composed of grating pairs, and outputs high-power pulses.

[0034] Embodiment 3: Primary power preamplification module

[0035] The first power preamplification module 2 has the following optical path structure: the optical pulse is transmitted to the third grating 202 through the first mirror 201 (GMH12-005-AU mirror of Hengyuan Optics), the third grating 202 transmits the optical pulse to the second mirror 203 (GMH12-005-AU mirror of Hengyuan Optics), and then reflects to the third mirror 204 (GMH12-005-AU mirror of Hengyuan Optics), the third mirror 204 reflects the optical pulse back to the third grating 202, the pulse output by the third grating 202 is transmitted to the fourth mirror 206 (GMH12-005-AU mirror of Hengyuan Optics) through the first convex lens 205 (GLH12-002-002-NIR convex lens of Hengyuan Optics), and then reflected back to the third grating 202 through the first convex lens 205, the optical pulse is transmitted to the second mirror 203 through the third grating 202, the second mirror 203 reflects the optical pulse and then reflects to the third grating 202 through the third mirror 204, the optical pulse output by the third grating 202 is incident to the first Boro prism 207 and reflected back to the third grating 202 through the first Boro prism 207 (POP0012-5 Boro prism of Union Optics), the optical pulse passes through the third grating 202 again, and then passes through the second mirror 203, the third mirror 204, the third grating 202, the first convex lens 205, the fourth mirror 206, and is reflected back to the third grating 202 again, the third grating 202 transmits the optical pulse to the second convex lens 208, the optical pulse passes through the second convex lens 208 (GLH12-002-002-NIR convex lens of Hengyuan Optics), the acousto-optic modulator 209 (Fiber-Q acousto-optic modulator of Gooch & Housego), the third convex lens 210 (GLH12-002-002-NIR convex lens of Hengyuan Optics), the first isolator 211 (HOI-005-532 isolator of Hengyang Optics), the fourth half-wave plate 212 (WPZ2310-248 half-wave plate of Hengyuan Optics), and is incident to the fifth mirror 213 (GMH12-005-AU mirror of Hengyuan Optics), the optical pulse is reflected to the sixth mirror 214 (GMH12-005-AU mirror of Hengyuan Optics) through the fifth mirror 213, and is incident to the fourth convex lens 215 (GLH12-002-002-NIR convex lens of Hengyuan Optics), the optical pulse passes through the fourth convex lens 215, the fifth collimator 216 (M011 collimator of WT&T), the third ytterbium-doped fiber 217 (Er80-4 / 125 ytterbium-doped fiber of Thorlabs), the sixth collimator 218 (M011 collimator of WT&T), and the fifth convex lens 219 (GLH12-002-002-NIR convex lens of Hengyuan Optics), and is incident to the seventh mirror 220.The pump light generated by the first photodiode 222 (D4F2P22-976 photodiode of DILAS company) is incident on the seventh mirror 220 (GMH12-005-AU mirror of Hengyuan Optics) after passing through the seventh collimator 223 (M011 collimator of WT&T company) and the sixth convex lens 224 (GLH12-002-002-NIR convex lens of Hengyuan Optics), and is fused with the light pulse previously incident on the seventh mirror 220. The fused light pulse is reflected by the seventh mirror 220 to the eighth mirror 221 (GMH12-005-AU mirror of Hengyuan Optics), and is transmitted to the fifth half-wave plate 225 (WPZ2310-248 half-wave plate of Hengyuan Optics) and then to the third quarter-wave plate 226 (WPZ4310-248 quarter-wave plate of Hengyuan Optics) and finally output by the third quarter-wave plate 226. The first power pre-amplification module 2 compresses the spectral width of the pulse, reduces the pulse repetition frequency, effectively prevents the damage of the amplified pulse to the device, and improves the pulse energy.

[0036] Embodiment 4: Pulse time domain separation module

[0037] The pulse time domain separation module 3 has the following optical path structure: the light pulse is incident on the input end of the third polarizing beam splitter 302 (Kongtum company QTFBC-1216 polarizing beam splitter) through the sixth half-wave plate 301 (Hengyang optical WPZ2310-248 half-wave plate), the light pulse is output from the output end perpendicular to the incident direction of the third polarizing beam splitter 302, and is transmitted to the ninth mirror 304 (Hengyang optical GMH12-005-AU mirror) through the fourth quarter-wave plate 303 (Hengyang optical WPZ4310-248 quarter-wave plate), the ninth mirror 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 polarizing beam splitter 302 again, and the light pulse is transmitted to the tenth mirror 306 (Hengyang optical GMH12-005-AU mirror) and the first piezoelectric driver 307 (GOSTAGE LLS4545) through the fifth quarter-wave plate 305 (Hengyang optical WPZ4310-248 quarter-wave plate) from the other output end of the third polarizing beam splitter 302 perpendicular to the incident direction, the light pulse is reflected by the tenth mirror 306 back to the fifth quarter-wave plate 305, the fifth quarter-wave plate 305 transmits the light pulse back to the third polarizing beam splitter 302 again, and the light pulse is output from the port parallel to the incident direction of the third polarizing beam splitter 302, transmitted to the fourth polarizing beam splitter 309 (Kongtum company QTFBC-1216 polarizing beam splitter) through the seventh half-wave plate 308 (Hengyang optical WPZ2310-248 half-wave plate), the light pulse is transmitted to the eleventh mirror 311 (Hengyang optical GMH12-005-AU mirror) through the sixth quarter-wave plate 310 (Hengyang optical WPZ4310-248 quarter-wave plate) from the port of the fourth polarizing beam splitter 309 perpendicular to the incident direction, the eleventh mirror 311 reflects the light pulse back to the sixth quarter-wave plate 310, the sixth quarter-wave plate 310 transmits the light pulse back to the fourth polarizing beam splitter 309 again, and the light pulse is transmitted to the twelfth mirror 313 (Hengyang optical GMH12-005-AU mirror) and the second piezoelectric driver 314 (GO STAGE LLS4545) through the seventh quarter-wave plate 312 (Hengyang optical WPZ4310-248 quarter-wave plate) from the other port of the fourth polarizing beam splitter 309 perpendicular to the incident direction, the light pulse is reflected by the twelfth mirror 313 back to the seventh quarter-wave plate 312, the seventh quarter-wave plate 312 transmits the light pulse to the fourth polarizing beam splitter 309 again, and the light pulse is output from the output end parallel to the incident direction of the fourth polarizing beam splitter 309. The pulse time domain separation module 3 realizes time division replication of the pulse.

[0038] Embodiment 5 Fourier space-time transformation shaping module

[0039] The Fourier spacetime transform shaping module 4 has the following optical path structure: the light pulse is transmitted to the fourth grating 401 (LightSmyth LFSSG-1000-4085-94 grating), the light pulse is reflected by the fourth grating 401 to the concave mirror 402 (Hengyang Optics GMH-13 concave mirror), the concave mirror 402 reflects the light pulse to the thirteenth mirror 403 (Hengyang Optics GMH12-005-AU mirror), the light pulse is reflected by the thirteenth mirror 403 to the concave mirror 402, and then transmitted through the concave mirror 402. The light pulse reaches the fourth grating 401, then travels through the concave mirror 402 and the thirteenth reflecting mirror 403. After multiple reflections, the light pulse returns to the fourth grating 401, which reflects it to the fourteenth reflecting mirror 404 (Hengyang Optics GMH12-005-AU reflecting mirror). The light pulse then travels through the fourteenth reflecting mirror 404 to the fifteenth reflecting mirror 405, and finally to the sixteenth reflecting mirror 406 (Hengyang Optics GMH12). The light pulse, after being transmitted from the -005-AU reflector to the seventeenth reflector 407 (Hengyang Optics GMH12-005-AU reflector) via the sixteenth reflector 406, undergoes spectral shaping sequentially through seven reflectors: the eighteenth reflector 408 (Hengyang Optics GMH12-005-AU reflector), the nineteenth reflector 409 (Hengyang Optics GMH12-005-AU reflector), the twentieth reflector 410 (Hengyang Optics GMH12-005-AU reflector), and the twenty-first reflector 411. After reflection by the twenty-second mirror 412 (GMH12-005-AU), twenty-third mirror 413 (GMH12-005-AU), and twenty-fourth mirror 414 (GMH12-005-AU), the light pulse is incident on the twenty-fifth mirror 415 (GMH12-005-AU). The output of the twenty-fifth mirror 415 is the output of the polarization pulse segmentation module. The Fourier spacetime transform shaping module 4 pre-compensates for the nonlinear phase shift accumulated during pulse transmission and compresses the pulse width.

[0040] Example 6: Two-stage power amplifier module

[0041] The secondary power amplification module 5 has the following optical path structure: the optical pulse is incident to the input end of the first beam splitter 501 (SIGMA OBCL20-1064-R5), transmitted from the output end of the first beam splitter 501 to the twenty-sixth mirror 502 (Hengyuan Optics GMH12-005-AU mirror), reflected by the twenty-sixth mirror 502 to the twenty-seventh mirror 503 (Hengyuan Optics GMH12-005-AU mirror), reflected by the twenty-seventh mirror 503 to the twenty-eighth mirror 504 (Hengyuan Optics GMH12-005-AU mirror), reflected by the twenty-eighth mirror 504 to the twenty-ninth mirror 505 (Hengyuan Optics GMH12-005-AU mirror), reflected by the twenty-ninth mirror 505 to the seventh convex lens 506 (Hengyuan Optics GLH12-002-002-NIR convex lens), transmitted through the seventh convex lens 506, the eighth convex lens 507 (Hengyuan Optics GLH12-002-002-NIR convex lens), and the first dichroic mirror 508 (Thorlabs DMSP1180 dichroic mirror), and then outputted by the first dichroic mirror 508, the optical pulse is fused with the optical pulse reflected by the sixty-third mirror 592 (Hengyuan Optics GMH12-005-AU mirror) to the first dichroic mirror 508, and then outputted by the first dichroic mirror 508, the fused optical pulse is transmitted by the first dichroic mirror 508 to the first KTiAsO4 crystal 509, the optical pulse is transmitted by the first KTiAsO4 crystal 509 to the second dichroic mirror 510 (Thorlabs DMSP1180 dichroic mirror), the short-wavelength optical pulse reflected by the second dichroic mirror 510 is transmitted to the thirtieth mirror 588 (Hengyuan Optics GMH12-005-AU mirror), the long-wavelength optical pulse transmitted by the second dichroic mirror 510 is transmitted to the third dichroic mirror 511 (Thorlabs DMSP1180 dichroic mirror), the optical pulse reflected by the third dichroic mirror 511 is transmitted to the thirty-first mirror 589 (Hengyuan Optics GMH12-005-AU mirror), the optical pulse transmitted by the third dichroic mirror 511 is incident to the thirty-second mirror 512 (Hengyuan Optics GMH12-005-AU mirror), the optical pulse is reflected by the thirty-second mirror 512 to the thirty-third mirror 513 (Hengyuan Optics GMH12-005-AU mirror), reflected by the thirty-third mirror 513 to the ninth convex lens 514 (Hengyuan Optics GLH12-002-002-NIR convex lens), transmitted by the ninth convex lens 514 to the tenth convex lens 515 (Hengyuan Optics GLH12-002-002-NIR convex lens), and then incident to the thirty-fourth mirror 516 after passing through the tenth convex lens 515, the optical pulse is reflected by the thirty-fourth mirror 516 (Hengyuan Optics GMH12-005-AU mirror) to the thirty-fifth mirror 517,reflected by the thirty-fifth mirror 517 (HANTHO optical GMH12-005-AU mirror) to the thirty-sixth mirror 518 (HANTHO optical GMH12-005-AU mirror), reflected by the thirty-sixth mirror 518 to the thirty-seventh mirror 519 (HANTHO optical GMH12-005-AU mirror), transmitted by the thirty-seventh mirror 519 to the fourth dichroic mirror 520 (Thorlabs company DMSP1180 dichroic mirror), transmitted by the fourth dichroic mirror 520 to the second KTiAsO4 crystal 521 (DIENTECH, density 3.454 g / cm, 3The light pulses are transmitted to the second KTiAsO4crystal 521, and then transmitted to the fifth dichroic mirror 522 (Thorlabs DMSP1180 dichroic mirror) through the second KTiAsO4crystal 521. The light pulses reflected by the fifth dichroic mirror 522 are transmitted to the thirty-eighth reflector 590 (Gooch & Housego GMH12-005-AU reflector). The light pulses transmitted by the fifth dichroic mirror 522 are transmitted to the sixth dichroic mirror 523 (Thorlabs DMSP1180 dichroic mirror) through the sixth dichroic mirror 523. The light pulses reflected by the sixth dichroic mirror 523 are transmitted to the thirty-ninth reflector 591 (Gooch & Housego GMH12-005-AU reflector). The light pulses transmitted by the sixth dichroic mirror 523 are incident on the eleventh convex lens 524 (Gooch & Housego GLH12-002-002-NIR convex lens) through the eleventh convex lens 524. The light pulses are transmitted to the twelfth convex lens 525 (Gooch & Housego GLH12-002-002-NIR convex lens) through the twelfth convex lens 525. The light pulses are incident on the fifth grating 527 (LightSmyth LSFSG-1000-585-94 grating) through the twelfth convex lens 525. The fifth grating 527 reflects the light pulses to the sixth grating 528 (LightSmyth LSFSG-1000-585-94 grating). The sixth grating 528 reflects the light pulses to the first roof mirror 529. The light pulses are reflected to the fifth grating 527 along the input route after reaching the first roof mirror 529. The fifth grating 527 transmits the light pulses to the fortieth reflector 526 (Gooch & Housego GMH12-005-AU reflector). The light pulses are reflected to the forty-first reflector 530 (Gooch & Housego GMH12-005-AU reflector) through the fortieth reflector 526. The light pulses are reflected to the forty-second reflector 531 (Gooch & Housego GMH12-005-AU reflector) through the forty-first reflector 530. The light pulses are reflected to the forty-third reflector 532 (Gooch & Housego GMH12-005-AU reflector) through the forty-second reflector 531. The light pulses are reflected to the forty-fourth reflector 533 (Gooch & Housego GMH12-005-AU reflector) through the forty-third reflector 532. The light pulses are reflected to the knife-edge prism 584 through the forty-fourth reflector 533. The light pulses are transmitted to the forty-fifth reflector 534 (Gooch & Housego GMH12-005-AU reflector) from the other output end of the first beam splitter 501. The light pulses are reflected to the forty-sixth reflector 535 (Gooch & Housego GMH12-005-AU reflector) through the forty-fifth reflector 534. The light pulses are reflected to the forty-seventh reflector 536 (Gooch & Housego GMH12-005-AU reflector) through the forty-sixth reflector 535. The light pulses are reflected to the forty-eighth reflector 537 (Gooch & Housego GMH12-005-AU reflector) through the forty-seventh reflector 536. The light pulses are reflected to the forty-ninth reflector 538 (Gooch & Housego GMH12-005-AU reflector) through the forty-eighth reflector 537.The light pulse is reflected by the forty-ninth mirror 538 to the thirteenth convex lens 539 (GLH12-002-002-NIR convex lens of Hengyuan Optics), and after passing through the thirteenth convex lens 539 and the fourteenth convex lens 540 (GLH12-002-002-NIR convex lens of Hengyuan Optics), the light pulse is reflected by the fourteenth convex lens 540 to the seventh dichroic mirror 541 (DMSP1180 dichroic mirror of Thorlabs), and after being transmitted by the seventh dichroic mirror 541, the light pulse is fused with the light pulse reflected after being incident on the seventh dichroic mirror 541 along the sixty-sixth mirror 593, and the fused light pulse is incident on the third KTiAsO4crystal 542 (DIENTECH, density 3.454 g / cm, 3KTA crystal), the light pulse is transmitted to the eighth dichroic mirror 543 (Thorlabs DMSP1180 dichroic mirror) through the third KTiAs04 crystal 542, the light pulse reflected from the eighth dichroic mirror 543 (Thorlabs DMSP1180 dichroic mirror) is reflected to the fiftieth mirror 544 (Gooch & Housego GMH12-005-AU mirror), the light pulse transmitted from the eighth dichroic mirror 543 is transmitted to the ninth dichroic mirror 545 (Thorlabs DMSP1180 dichroic mirror), the light pulse reflected by the ninth dichroic mirror 545 is transmitted to the fifty-first mirror 546 (Gooch & Housego GMH12-005-AU mirror), the light pulse transmitted by the ninth dichroic mirror 545 is incident to the fifty-second mirror 547, the light pulse is reflected to the fifty-third mirror 548 (Gooch & Housego GMH12-005-AU mirror) by the fifty-second mirror 547 (Gooch & Housego GMH12-005-AU mirror), after being reflected by the fifty-third mirror 548 to the fifteenth convex lens 549 (Gooch & Housego GLH12-002-002-NIR convex lens), the light pulse passes through the fifteenth convex lens 549, the sixteenth convex lens 550 (Gooch & Housego GLH12-002-002-NIR convex lens), and is incident to the fifty-fourth mirror 551 (Gooch & Housego GMH12-005-AU mirror), the light pulse is reflected to the fifty-fifth mirror 552 (Gooch & Housego GMH12-005-AU mirror) by the fifty-fourth mirror 551, is reflected to the fifty-sixth mirror 553 (Gooch & Housego GMH12-005-AU mirror) by the fifty-fifth mirror 552, is reflected to the fifty-seventh mirror 554 (Gooch & Housego GMH12-005-AU mirror) by the fifty-sixth mirror 553, is reflected to the tenth dichroic mirror 555 (Thorlabs DMSP1180 dichroic mirror) by the fifty-seventh mirror 554 and is transmitted by the tenth dichroic mirror 555 and output, the output light pulse is fused with the light pulse reflected by the sixty-seventh mirror 583 to the tenth dichroic mirror 555 and output, and is incident to the fourth KTiAs04 crystal 556, the light pulse is transmitted by the fourth KTiAs04 crystal 556 (DIENTECH, density 3.454 g / cm 3The light pulse transmitted from the KTA crystal to the eleventh dichroic mirror 557 (Thorlabs DMSP1180 dichroic mirror) is transmitted to the fifty-eighth mirror 558 (Hengyang Optics GMH12-005-AU dichroic mirror). The light pulse transmitted from the eleventh dichroic mirror 557 is transmitted to the twelfth dichroic mirror 559 (Thorlabs DMSP1180 dichroic mirror). The light pulse reflected by the twelfth dichroic mirror 559 is... The light pulse transmitted from the 12th dichroic mirror 559 to the 59th reflector 560 (Hengyang Optics GMH12-005-AU reflector) is incident on the 17th convex lens 561 (Hengyang Optics GLH12-002-002-NIR convex lens), and then transmitted to the 18th convex lens 562 (Hengyang Optics GLH12-002-002-NIR convex lens), and finally incident on the 7th grating 563 (Li The light pulse (LightSmyth T-1702-1030s) is reflected by the seventh grating 563 to the eighth grating 564 (LightSmyth T-1702-1030s). The eighth grating 564 reflects the light pulse to the second roof mirror 565 (Hongsheng Optoelectronics HS-002103). After reaching the second roof mirror 565, the light pulse is reflected back to the seventh grating 563 along the input path. The seventh grating 563 then transmits the light pulse to the sixtieth reflection... The light pulse is reflected by mirror 566 (Hengyang Optics GMH12-005-AU reflector), then by mirror 567 (Hengyang Optics GMH12-005-AU reflector), and finally by mirror 568 (Hengyang Optics GMH12-005-AU reflector) to knife-edge prism 584. The pulse is then emitted by laser 569 (EKSPLA APL). The light pulse pumped by the 2105 commercial picosecond Nd:YAG laser is transmitted to the thirteenth dichroic mirror 570 (Thorlabs DMSP1180 dichroic mirror). The light pulse reflected from the thirteenth dichroic mirror 570 passes through the eighth half-wave plate 571 (Hengyang Optics WPZ2310-248 half-wave plate) and is incident on the first thin-film polarizer 572 (Thorlabs LPNIRE11S). The parallel polarized light pulse transmitted through the first thin-film polarizer 572 is incident on the sixty-third mirror 592 (Hengyang Optics GMH12-005-AU mirror). The light pulse is reflected by the sixty-third mirror 592 to the first dichroic mirror 508. The vertically polarized light pulse reflected by the first thin-film polarizer 572 is incident on the second thin-film polarizer 573 (Thorlabs LPNIRE11S).The light pulse is reflected by the second thin film polarizer 573, transmitted by the ninth half wave plate 574 (Hengyuan Optics WPZ2310-248 half wave plate) and the fourth Yb-doped fiber 575 (PM-YDF-HI Yb-doped fiber of Nufern), and reaches the sixty-fourth mirror 576 (Hengyuan Optics GMH12-005-AU mirror). The light pulse is reflected by the sixty-fourth mirror 576, reaches the fourth dichroic mirror 520, and is reflected by the fourth dichroic mirror 520. The light pulse reflected by the fourth dichroic mirror 520 is fused with the light pulse transmitted by the fourth dichroic mirror 520 after being incident on the fourth dichroic mirror 520 through the thirty-seventh mirror 519. The fused light pulse is incident on the second KTiAsO4 crystal 521. The light pulse output from the thirteenth dichroic mirror 570 is transmitted by the sixty-fifth mirror 577 (Hengyuan Optics GMH12-005-AU mirror) and the tenth half wave plate 578 (Hengyuan Optics WPZ2310-248 half wave plate). The light pulse is incident on the third thin film polarizer 579 (Thorlabs LPNIRE11S) through the tenth half wave plate 578. The parallel polarized light pulse transmitted by the third thin film polarizer 579 is incident on the sixty-sixth mirror 593 (Hengyuan Optics GMH12-005-AU mirror). The light pulse is reflected by the sixty-sixth mirror 593 and reaches the seventh dichroic mirror 541. The perpendicular polarized light pulse reflected by the third thin film polarizer 579 is incident on the fourth thin film polarizer 580. The light pulse is reflected by the fourth thin film polarizer 580, transmitted by the eleventh half wave plate 581 (Hengyuan Optics WPZ2310-248 half wave plate) and the fifth Yb-doped fiber 582 (PM-YDF-HI Yb-doped fiber of Nufern), and reaches the sixty-seventh mirror 583 (Hengyuan Optics GMH12-005-AU mirror). The light pulse is reflected by the sixty-seventh mirror 583 and reaches the tenth dichroic mirror 555. The two light pulses incident on the knife-edge prism 584 are transmitted by the knife-edge prism 584 and reach the sixty-eighth mirror 585 (Hengyuan Optics GMH12-005-AU mirror). The light pulse is reflected by the sixty-eighth mirror 585, reaches the sixty-ninth mirror 586 (Hengyuan Optics GMH12-005-AU mirror), and is reflected by the CaF2 lens 587. The two light pulses are fused and output after being transmitted by the CaF2 lens 587 (Hengyuan Optics GWH51-012).

[0042] Embodiment 7 Polarized pulse synthesis module

[0043] The polarization pulse synthesis module 6 has the following optical path structure: the light pulse is incident to the fifth polarization beam splitter 601 (Kongtum QTFBC-1216 polarization beam splitter), the output end of the light pulse is output by the perpendicular incidence direction of the fifth polarization beam splitter 601, the light pulse is reflected to the seventy-first mirror 603 (Hengyang optical GMH12-005-AU mirror) by the seventy-first mirror 602 (Hengyang optical GMH12-005-AU mirror), reflected to the seventy-second mirror 604 (Hengyang optical GMH12-005-AU mirror) by the seventy-first mirror 603, reflected to the seventy-third mirror 605 (Hengyang optical GMH12-005-AU mirror) by the seventy-second mirror 604, and after being reflected to the fifth polarization beam splitter 601 by the seventy-third mirror 605, the light pulse is output by the output end parallel to the incidence direction of the fifth polarization beam splitter 601, and after the light pulse is output by the fifth polarization beam splitter 601, it is transmitted to the sixth polarization beam splitter 607 (Kongtum QTFBC-1216 polarization beam splitter) by the twelfth half-wave plate 606 (Hengyang optical WPZ2310-248 half-wave plate), and the light pulse is transmitted to the seventy-fourth mirror 495 (Hengyang optical GMH12-005-AU mirror) by the output end perpendicular to the incidence direction of the sixth polarization beam splitter 607, and the light pulse is reflected to the seventy-fifth mirror 609 (Hengyang optical GMH12-005-AU mirror) by the seventy-fourth mirror 608, reflected to the seventy-sixth mirror 610 by the seventy-fifth mirror 609, reflected to the seventy-seventh mirror 611 (Hengyang optical GMH12-005-AU mirror) by the seventy-sixth mirror 610 (Hengyang optical GMH12-005-AU mirror), and the light pulse is output by the other output end parallel to the incidence direction of the sixth polarization beam splitter 607, and the light pulse is transmitted to the thirteenth half-wave plate 612 (Hengyang optical WPZ2310-248 half-wave plate) by the sixth polarization beam splitter 607, and finally output by the seventh polarization beam splitter 613 (Kongtum QTFBC-1216 polarization beam splitter).

[0044] Example 8 Spectral expansion module

[0045] The spectral expansion module 7 has the following optical path structure: the light pulse is incident on the ninth grating 703 through the third roof mirror 701 (macro light HS-002103), the fourteenth half wave plate 702 (Hengyang Optics WPZ2310-248 half wave plate), the light pulse output by the ninth grating 703 is transmitted to the seventy-eighth reflecting mirror 705 (Hengyang Optics GMH12-005-AU reflecting mirror) through the nineteenth convex lens 704 (Hengyang Optics GLH12-002-002-NIR convex lens), the light pulse is reflected by the seventy-eighth reflecting mirror 705 to the nineteenth convex lens 704 and then returns to the ninth grating 703, the light pulse is transmitted to the seventy-ninth reflecting mirror 706 (Hengyang Optics GMH12-005-AU reflecting mirror) through the ninth grating 703, and then is reflected by the seventy-ninth reflecting mirror 706 to the eightieth reflecting mirror 707 (Hengyang Optics GMH12-005-AU reflecting mirror), the light pulse reflected by the seventy-ninth reflecting mirror 706 is transmitted to the ninth grating 703, the light pulse is transmitted to the second wave plate 708 through the ninth grating 703, and then is reflected back to the ninth grating 703 along the original path, the light pulse passes through the ninth grating 703 again, and then passes through the nineteenth convex lens 704, the seventy-eighth reflecting mirror 705, the seventy-ninth reflecting mirror 706, the eightieth reflecting mirror 707, the ninth grating 703 and the second wave plate 708 (Union Optics POP0012-5 wave plate), and after multiple reflections, the light pulse returns to the ninth grating 703, the ninth grating 703 transmits the light pulse to the second beam splitter 709, the light pulse output through the second beam splitter 709 is output to the third beam splitter 710, the light pulse is output to the first adjustable light diaphragm 711 through the third beam splitter 710 (SIGMA OBCL20-1064-R5), and then is incident on the eighty-first reflecting mirror 716 (Hengyang Optics GMH12-005-AU reflecting mirror) after passing through the first adjustable light diaphragm 711 (Thorlabs ID25), the variable optical density adjuster 712 (Thorlabs NEV0830M), the twentieth convex lens 713 (Hengyang Optics GLH12-002-002-NIR convex lens), the sapphire crystal 714 (Optogama 5mm thick c-cut sapphire crystal) and the twenty-first convex lens 715 (Hengyang Optics GLH12-002-002-NIR convex lens), the light pulse is reflected by the eighty-first reflecting mirror 716 to the fourteenth dichroic mirror 724 and is transmitted and output to the third filter 725 (Hengyang Optics HANF-D25-006 T:25%) through the fourteenth dichroic mirror 724 (Thorlabs DMSP1180 dichroic mirror), and the light pulse output from the other end of the third beam splitter 710 is incident on the second adjustable light diaphragm 717,The light pulse is reflected by the eighty-second mirror 718 (GMH12-005-AU mirror of Hengyuan Optics), the eighty-third mirror 719 (GMH12-005-AU mirror of Hengyuan Optics) and the eighty-fourth mirror 720 (GMH12-005-AU mirror of Hengyuan Optics) in turn, and is reflected to the twenty-second convex lens 721 (GLH12-002-002-NIR convex lens of Hengyuan Optics). After the light pulse passes through the twenty-second convex lens 721, it passes through the first BBO crystal 722 (2mm-thick type-I phase matching BBO crystal) and the SF11 glass 723 in turn, and is incident on the fourteenth dichroic mirror 724. The light pulse is reflected by the fourteenth dichroic mirror 724 and is fused with the light beam transmitted and output from the eighty-first mirror 716 to the fourteenth dichroic mirror 724. The fused light beam passes through the third filter 725, the second BBO crystal 726 (3mm-thick type-I phase matching BBO crystal), the twenty-third convex lens 727 (GLH12-002-002-NIR convex lens of Hengyuan Optics) and the fourth filter 728 (HANF-D25-006 T:25% of Hengyuan Optics) in turn, is transmitted to the fifteenth dichroic mirror 734 through the fourth filter 728, and is transmitted to the third BBO crystal 735 (2mm-thick type-II phase matching BBO crystal) through the fifteenth dichroic mirror 734 (DMSP1180 dichroic mirror of Thorlabs). The light pulse output from the other output end of the second beam splitter 709 is incident on the eighty-fifth mirror 729 (GMH12-005-AU mirror of Hengyuan Optics) through the third adjustable aperture 736. The light pulse is reflected by the eighty-fifth mirror 729 to the eighty-sixth mirror 730 (GMH12-005-AU mirror of Hengyuan Optics), is reflected by the eighty-sixth mirror 730 to the eighty-seventh mirror 731 (GMH12-005-AU mirror of Hengyuan Optics), and passes through the twenty-fourth convex lens 732 (GLH12-002-002-NIR convex lens of Hengyuan Optics) and the fifteenth half-wave plate 733 (WPZ2310-248 half-wave plate of Hengyuan Optics) in turn. The light pulse is transmitted to the fifteenth dichroic mirror 734 through the fifteenth half-wave plate 733 (DMSP1180 dichroic mirror of Thorlabs), is reflected by the fifteenth dichroic mirror 734, is fused with the light pulse transmitted and output from the fifteenth dichroic mirror 734, is transmitted to the third BBO crystal 735, and is output from the third BBO crystal 735. The spectral expansion module 7 realizes further pulse width compression and nonlinear frequency conversion, and obtains tunable light pulses.

[0046] Embodiment 9 Working principle of the present application

[0047] The working principle of the present application is described in combination with the above embodiments and the accompanying drawings.

[0048] The seed pulse source 1 uses the first grating 115 and the second grating 116 to realize pulse multiplexing to obtain stable higher power pulse output. The first-stage power pre-amplification module 2 compresses the pulse spectral width to prevent the amplified pulse from damaging the amplifier device. The acousto-optic modulator 209 can reduce the optical pulse repetition frequency to obtain higher pulse energy in the subsequent structure. Due to the very short pulse width of femtosecond pulses, the wide bandwidth is accompanied by a gain narrowing effect in the amplification process. The spectral shaping structure composed of the fourth grating 401, the concave mirror 402, the thirteenth mirror 403 and the seven-mirror group can pre-compensate the gain narrowing effect and compress the pulse width. The second-stage power amplification module 5 uses a double-channel pre-amplification structure for power amplification. In the spectral expansion module 7, spatial optical lenses and gratings are used to further compress the pulse width to obtain ultrashort pulses. Finally, the optical pulse passes through the center wavelength shift structure constructed by the nonlinear crystal to perform nonlinear frequency conversion, and high-power ultrashort pulses with a spectrum tunable in the range of 1200 nm to 2500 nm are obtained.

Claims

1. A high-power spectral width tunable ultrashort pulse generation system, the structure of which is as follows: the output end of the seed pulse source (1) is connected to the input end of the first-stage power pre-amplification module (2), the output end of the first-stage power pre-amplification module (2) is connected to the input end of the pulse time domain separation module (3), the output end of the pulse time domain separation module (3) is connected to the input end of the Fourier space-time transform shaping module (4), the output end of the Fourier space-time transform shaping module (4) is connected to the input end of the second-stage power amplification module (5), the output end of the second-stage power amplification module (5) is connected to the input end of the polarization pulse synthesis module (6), and the output end of the polarization pulse synthesis module (6) is connected to the input end of the spectral expansion module (7); The seed pulse source (1) is structured as follows: the first pump source (101) is connected to the 980nm end of the first pump coupler (102), the 1060nm end of the first pump coupler (102) is connected to the first collimator (104) through the first ytterbium-doped fiber (103), the light pulse output from the first collimator (104) is incident on the first polarization beam splitter (105), and the light pulse output from the first polarization beam splitter (105) passes through the first free space isolator (106), the first half-wave plate (107), the first filter (108), the first quarter-wave plate (109), and the second collimator (110), and is connected to the common end of the second pump coupler (112). The 980nm end of the second pump coupler (112) is connected to the second pump source (111), and the 1060nm end of the second pump coupler (112) is connected through the second ytterbium-doped fiber (113). The light pulse output from the third collimator (114) is connected to the input end of the third collimator (114) and is incident on the first grating (115). The light pulse is reflected by the first grating (115) to the second grating (116), and then reflected by the second grating (116) to the photonic crystal fiber (117). The light pulse passes through the photonic crystal fiber (117), the second quarter-wave plate (118), the second half-wave plate (119), the second polarization beam splitter (120), the second free space isolator (121), and the third half-wave plate (122) in sequence. The light pulse is then incident on the second filter (123) through the third half-wave plate (122). The light pulse is transmitted through the second filter (123) to the fourth collimator (124). The fourth collimator (124) is connected to the common end of the first pump coupler (102) and is finally output from the output end of the second polarization beam splitter (120) perpendicular to the incident direction. The first-stage power pre-amplification module (2) has the following optical path structure: the light pulse is transmitted to the third grating (202) via the first reflector (201), the third grating (202) transmits the light pulse to the second reflector (203), and then reflects it to the third reflector (204). The third reflector (204) reflects the light pulse back to the third grating (202). The pulse output by the third grating (202) is transmitted to the fourth reflector (206) via the first convex lens (205), and then reflected back to the third grating (202) via the first convex lens (205). The light pulse is then transmitted through the third grating (202). The light pulse is reflected by the second mirror (203) and then by the third mirror (204) before being incident on the third grating (202). The light pulse output from the third grating (202) is incident on the first Boro prism (207) and reflected back to the third grating (202). After passing through the third grating (202), the light pulse passes through the second mirror (203), the third mirror (204), the third grating (202), the first convex lens (205), and the fourth mirror (206) again, and after multiple reflections, it returns to the third grating (202). The grating (202) directs the light pulse to the second convex lens (208). The light pulse passes through the second convex lens (208), the acousto-optic modulator (209), the third convex lens (210), the first isolator (211), and the fourth half-wave plate (212) before being directed to the fifth reflecting mirror (213). The light pulse is reflected by the fifth reflecting mirror (213) to the sixth reflecting mirror (214) and then to the fourth convex lens (215). The light pulse then passes through the fourth convex lens (215), the fifth collimator (216), the third ytterbium-doped fiber (217), the sixth collimator (218), and the fifth convex lens (219) before being directed to the fifth convex lens (219). The light pulse is incident on the seventh reflector (220); the pump light generated by the first photodiode (222) passes through the seventh collimator (223) and the sixth convex lens (224) and then enters the seventh reflector (220), where it merges with the light pulse that was previously incident on the seventh reflector (220); the merged light pulse is reflected by the seventh reflector (220) to the eighth reflector (221), and the eighth reflector (221) reflects the light pulse to the fifth half-wave plate (225), which then transmits it to the third quarter-wave plate (226), and finally outputs it from the third quarter-wave plate (226); The pulse time-domain separation module (3) 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), the light pulse is output from the output end of the third polarization beam splitter (302) perpendicular to the incident direction and transmitted to the ninth mirror (304) through the fourth quarter-wave plate (303). The ninth 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 transmitted from the other output end of the third polarization beam splitter (302) perpendicular to the incident direction through the fifth quarter-wave plate (305) to the tenth mirror (306) and the first piezoelectric driver (307). The light pulse is reflected back to the fifth quarter-wave plate (305) by the tenth mirror (306), and the fifth quarter-wave plate (305) transmits the light pulse back to the third polarization beam splitter (302) again. The light pulse is then transmitted from the third polarization beam splitter (302) to the input end of the third polarization beam splitter (302). The output from the port parallel to the incident direction is transmitted to the fourth polarization beamsplitter (309) via the seventh half-wave plate (308). The light pulse is transmitted from the port of the fourth polarization beamsplitter (309) perpendicular to the incident direction via the sixth quarter-wave plate (310) to the eleventh mirror (311). The eleventh mirror (311) reflects the light pulse back to the sixth quarter-wave plate (310), and the sixth quarter-wave plate (310) transmits the light pulse back to the fourth polarization beamsplitter (309) again. At the same time, the light... After the light pulse is transmitted from another port of the fourth polarization beam splitter (309) perpendicular to the incident direction through the seventh quarter-wave plate (312) to the twelfth mirror (313) and the second piezoelectric driver (314), the light pulse is reflected back to the seventh quarter-wave plate (312) by the twelfth mirror (313), and the seventh quarter-wave plate (312) transmits the light pulse to the fourth polarization beam splitter (309) again. The light pulse is output from the output end of the fourth polarization beam splitter (309) parallel to the incident direction. The Fourier spacetime transform shaping module (4) has the following optical path structure: the light pulse is transmitted to the fourth grating (401), the light pulse is reflected by the fourth grating (401) to the concave mirror (402), the concave mirror (402) reflects the light pulse to the thirteenth mirror (403), the light pulse is reflected by the thirteenth mirror (403) to the concave mirror (402), and then transmitted to the fourth grating (401) via the concave mirror (402). After passing through the fourth grating (401), the light pulse is transmitted again via the concave mirror (402) and the thirteenth mirror (403). After multiple reflections, the light pulse returns to the fourth grating (401), the fourth grating (401) reflects the light pulse to the fourteenth mirror (404), and the light pulse is transmitted through the fourteenth mirror (404). The light pulse is transmitted from the reflector (404) to the fifteenth reflector (405), then to the sixteenth reflector (406), and finally to the seventeenth reflector (407). The light pulse undergoes spectral shaping through the seven reflectors in sequence. After being reflected by the eighteenth reflector (408), nineteenth reflector (409), twentieth reflector (410), twenty-first reflector (411), twenty-second reflector (412), twenty-third reflector (413), and twenty-fourth reflector (414), the light pulse is incident on the twenty-fifth reflector (415). The output of the twenty-fifth reflector (415) is the output of the polarization pulse module. The secondary power amplifier module (5) has the following optical path structure: the light pulse is incident on the input end of the first beam splitter (501), and is transmitted from the output end of the first beam splitter (501) to the twenty-sixth reflector (502). The light pulse is reflected by the twenty-sixth reflector (502) to the twenty-seventh reflector (503), and then reflected by the twenty-seventh reflector (503) to the twenty-eighth reflector (504). The twenty-eighth reflector (504) reflects the light pulse to the twenty-ninth reflector (505). The light pulse is reflected by the twenty-ninth reflector (505) to the seventh convex lens (506). After passing through the seventh convex lens (506), the eighth convex lens (507), and the first dichroic mirror (508), the light pulse passes through the first dichroic mirror (508) and then to the seventh convex lens (506). 08) Transmission output: The light pulse is fused with the light pulse reflected by the sixty-third mirror (592) to the first dichroic mirror (508) and then reflected out. The fused light pulse is transmitted through the first dichroic mirror (508) to the first KTiAsO4 crystal (509). The light pulse is transmitted through the first KTiAsO4 crystal (509) to the second dichroic mirror (510). The short-wavelength light pulse reflected from the second dichroic mirror (510) is transmitted to the thirtieth mirror (588). The long-wavelength light pulse transmitted from the second dichroic mirror (510) is transmitted to the third dichroic mirror (511). The light pulse reflected by the third dichroic mirror (511) is transmitted to the thirty-first mirror (589). The light pulse transmitted from the third dichroic mirror (511) is incident on the third dichroic mirror (511). The light pulse is reflected by the thirtieth-second mirror (512) to the thirtieth-third mirror (513), then to the ninth convex lens (514), and then to the tenth convex lens (515). After passing through the tenth convex lens (515), the light pulse is incident on the thirtieth-fourth mirror (516). The light pulse is reflected by the thirtieth-fourth mirror (516) to the thirty-fifth mirror (517), then to the thirty-sixth mirror (518), then to the thirty-seventh mirror (519), and then to the fourth dichroic mirror (520). The light pulse is transmitted through the color mirror (520) to the second KTiAsO4 crystal (521), and then transmitted through the second KTiAsO4 crystal (521) to the fifth dichroic mirror (522). The light pulse reflected from the fifth dichroic mirror (522) is transmitted to the thirty-eighth mirror (590). The light pulse transmitted from the fifth dichroic mirror (522) is transmitted to the sixth dichroic mirror (523). The light pulse reflected from the sixth dichroic mirror (523) is transmitted to the thirty-ninth mirror (591). The light pulse transmitted from the sixth dichroic mirror (523) is incident on the eleventh convex lens (524), and then transmitted through the eleventh convex lens (524) to the twelfth convex lens (525). Finally, the light pulse transmitted through the twelfth convex lens (525) is incident on the fifth grating (527).The fifth grating (527) reflects the light pulse to the sixth grating (528), the sixth grating (528) reflects the light pulse to the first roof mirror (529), and after reaching the first roof mirror (529), the light pulse is reflected back to the fifth grating (527) along the input path. The fifth grating (527) transmits the light pulse to the fortieth mirror (526), ​​and the light pulse is reflected by the fortieth mirror (526) to the forty-first mirror (530), then by the forty-first mirror (530) to the forty-second mirror (531), then by the forty-second mirror (531) to the forty-third mirror (532), then by the forty-third mirror (532) to the forty-fourth mirror (533), and finally by the forty-fourth mirror (533). The light pulse is reflected to the knife-edge prism (584), and then transmitted from the other output end of the first beam splitter (501) to the forty-fifth mirror (534). The light pulse is reflected by the forty-fifth mirror (534) to the forty-sixth mirror (535), then to the forty-seventh mirror (536), then to the forty-eighth mirror (537), and finally to the forty-ninth mirror (538). The light pulse is reflected by the forty-ninth mirror (538) to the thirteenth convex lens (539). After passing through the thirteenth convex lens (539) and the fourteenth convex lens (540), the light pulse is reflected by the fourteenth convex lens (540) to the seventh dichroic mirror (539). (541) After the light pulse is transmitted through the seventh dichroic mirror (541), it merges with the light pulse reflected after being incident on the seventh dichroic mirror (541) along the sixty-sixth reflecting mirror (593). The merged light pulse is incident on the third KTiAsO4 crystal (542) through the seventh dichroic mirror (541). The light pulse is transmitted through the third KTiAsO4 crystal (542) to the eighth dichroic mirror (543). The light pulse reflected from the eighth dichroic mirror (543) is reflected to the fiftieth reflecting mirror (544). The light pulse transmitted from the eighth dichroic mirror (543) is transmitted to the ninth dichroic mirror (545). The light pulse reflected by the ninth dichroic mirror (545) is transmitted to the fifty-first reflecting mirror (546). The light pulse transmitted by the ninth dichroic mirror (545) is incident on the... The light pulse is reflected by the 52nd reflector (547) to the 53rd reflector (548), then by the 53rd reflector (548) to the 15th convex lens (549). After passing through the 15th convex lens (549) and the 16th convex lens (550), the light pulse is incident on the 54th reflector (551). The light pulse is reflected by the 54th reflector (551) to the 55th reflector (552), then by the 55th reflector (552) to the 56th reflector (553), then by the 56th reflector (553) to the 57th reflector (554), and finally by the 57th reflector (554) to the 10th dichroic mirror (555), and then transmitted and output through the 10th dichroic mirror (555).The output light pulse and the light pulse reflected by the sixty-seventh mirror (583) to the tenth dichroic mirror (555) are fused and incident on the fourth KTiAsO4 crystal (556). The light pulse is transmitted through the fourth KTiAsO4 crystal (556) to the eleventh dichroic mirror (557). The light pulse reflected from the eleventh dichroic mirror (557) is transmitted to the fifty-eighth mirror (558). The light pulse transmitted from the eleventh dichroic mirror (557) is transmitted to the twelfth dichroic mirror (559). The light pulse reflected from the twelfth dichroic mirror (559) is transmitted to the fifty-ninth mirror (560). The light pulse transmitted from the twelfth dichroic mirror (559) is incident on the seventeenth convex lens (561). The light pulse is transmitted to the eighteenth convex lens (562), and then incident on the seventh grating (563). The seventh grating (563) reflects the light pulse to the eighth grating (564), which in turn reflects it to the second roof mirror (565). After reaching the second roof mirror (565), the light pulse is reflected back to the seventh grating (563) along the input path. The seventh grating (563) transmits the light pulse to the sixtieth mirror (566), which then reflects it to the sixty-first mirror (567). After being reflected by the sixty-first mirror (567), the light pulse is reflected to the sixty-second mirror (568), which then reflects it to the knife-edge prism (584). The light pulse pumped by the laser (569) is transmitted to the thirteenth dichroic mirror (570). The light pulse reflected from the thirteenth dichroic mirror (570) passes through the eighth half-wave plate (571) and is incident on the first thin-film polarizer (572). The parallel polarized light pulse transmitted through the first thin-film polarizer (572) is incident on the sixty-third mirror (592). The light pulse is reflected by the sixty-third mirror (592) to the first dichroic mirror (508). The vertically polarized light pulse reflected by the first thin-film polarizer (572) is incident on the second thin-film polarizer (573). After being reflected by the second thin-film polarizer (573), the light pulse passes through the ninth half-wave plate (574) and the fourth ytterbium-doped fiber (575) and is transmitted to the sixty-fourth mirror (578). 6) The light pulse is reflected by the sixty-fourth mirror (576) to the fourth dichroic mirror (520). The light pulse reflected by the fourth dichroic mirror (520) merges with the light pulse that is incident on the fourth dichroic mirror (520) through the thirty-seventh mirror (519) and then transmitted out through the fourth dichroic mirror (520). The merged light pulse is incident on the second KTiAsO4 crystal (521). The light pulse output from the thirteenth dichroic mirror (570) is transmitted to the tenth half-wave plate (578) through the sixty-fifth mirror (577). The light pulse is incident on the third thin-film polarizer (579) through the tenth half-wave plate (578). The parallel polarized light pulse transmitted out through the third thin-film polarizer (579) is incident on the sixty-sixth mirror (593).The light pulse is reflected by the sixty-sixth mirror (593) to the seventh dichroic mirror (541). The vertically polarized light pulse reflected by the third thin-film polarizer (579) is incident on the fourth thin-film polarizer (580). After being reflected by the fourth thin-film polarizer (580), the light pulse is transmitted through the eleventh half-wave plate (581) and the fifth ytterbium-doped fiber (582) to the sixty-seventh mirror (583). The light pulse is reflected by the sixty-seventh mirror (583) to the tenth dichroic mirror (555). Finally, the two identical light pulses incident on the knife-edge prism (584) are transmitted through the knife-edge prism (584) to the sixty-eighth mirror (585). The light pulse is reflected by the sixty-eighth mirror (585) to the sixty-ninth mirror (586) and then to the CaF2 lens (587). The two light pulses are merged by the CaF2 lens (587) and then output. The polarization pulse synthesis module (6) has the following optical path structure: the light pulse is incident on the fifth polarization beam splitter (601), and is output from the output end of the fifth polarization beam splitter (601) perpendicular to the incident direction. The light pulse is reflected by the seventieth mirror (602) to the seventy-first mirror (603), then by the seventy-first mirror (603) to the seventy-second mirror (604), then by the seventy-second mirror (604) to the seventy-third mirror (605), and then by the seventy-third mirror (605) back to the fifth polarization beam splitter (601). The light pulse is then output from the output end of the fifth polarization beam splitter (601) parallel to the incident direction. After being output from the fifth polarization beam splitter (601), the light pulse is transmitted to the sixth polarization beam splitter (607) via the twelfth half-wave plate (606). The light pulse then travels along the... The output end of the six polarization beam splitter (607) perpendicular to the incident direction is transmitted to the seventy-fourth mirror (608). The light pulse is reflected by the seventy-fourth mirror (608) to the seventy-fifth mirror (609), then by the seventy-fifth mirror (609) to the seventy-sixth mirror (610), then by the seventy-sixth mirror (610) to the seventy-seventh mirror (611), and then by the seventy-seventh mirror (611) back to the sixth polarization beam splitter (607). The light pulse is output through another output end parallel to the incident direction of the sixth polarization beam splitter (607). The light pulse is transmitted through the sixth polarization beam splitter (607) to the thirteenth half-wave plate (612), then by the thirteenth half-wave plate (612) to the seventh polarization beam splitter (613), and finally output by the seventh polarization beam splitter (613). The spectral expansion module (7) has the following optical path structure: the light pulse passes through the third roof mirror (701) and the fourteenth half-wave plate (702) and is incident on the ninth grating (703). The light pulse output from the ninth grating (703) is transmitted through the nineteenth convex lens (704) to the seventy-eighth reflector (705). The light pulse is reflected by the seventy-eighth reflector (705) back to the nineteenth convex lens (704) and then returns to the ninth grating (703). The light pulse is transmitted through the ninth grating (703) to the seventy-ninth reflector (706), and then reflected by the seventy-ninth reflector (706) to the eightieth reflector (707). The light pulse reflected by the seventy-ninth reflector (706) is transmitted to the ninth grating (703). The light pulse is transmitted through the ninth grating (707) to the ninetieth reflector (707). After being transmitted to the second Boro prism (708), the light pulse is reflected back to the ninth grating (703) along the original path. After passing through the ninth grating (703), the light pulse passes through the nineteenth convex lens (704), the seventy-eighth reflector (705), the seventy-ninth reflector (706), the eightieth reflector (707), the ninth grating (703), and the second Boro prism (708) again. After multiple reflections, the light pulse returns to the ninth grating (703). The ninth grating (703) transmits the light pulse to the second beam splitter (709). The light pulse after passing through the second beam splitter (709) is output to the third beam splitter (710). The light pulse after passing through the third beam splitter (710) is output to the first adjustable aperture (711). The light pulse passes through the first adjustable aperture (711) and the second convex lens (704), the seventy-eighth reflector (705), the seventy-ninth reflector (706), the eightieth reflector (707), the ninth grating (703), and the second Boro prism (708). After multiple reflections, the light pulse returns to the ninth grating (703). The ninth grating (703) transmits the light pulse to the second beam splitter (709). The light pulse after passing through the second beam splitter (709) is output to the third beam splitter (710). The light pulse after passing through the third beam splitter (710) is output to the first adjustable aperture (711). After passing through the variable light density adjuster (712), the twentieth convex lens (713), the sapphire crystal (714), and the twenty-first convex lens (715), the light pulse is incident on the eighty-first reflecting mirror (716). The light pulse is reflected by the eighty-first reflecting mirror (716) to the fourteenth dichroic mirror (724) and transmitted through the fourteenth dichroic mirror (724) to the third filter (725). The light pulse output from the other end of the third beam splitter (710) is incident on the second adjustable aperture (717). The light pulse passes through the second adjustable aperture (717) and is incident on the eighty-second reflecting mirror (718). After being reflected by the eighty-second reflecting mirror (718), the eighty-third reflecting mirror (719), and the eighty-fourth reflecting mirror (720) in sequence, the light pulse is reflected to The light pulse passes through the 22nd convex lens (721), then through the first BBO crystal (722) and SF11 glass (723), and is incident on the 14th dichroic mirror (724). The light pulse is reflected by the 14th dichroic mirror (724) and merges with the light beam that is reflected by the 81st reflector (716) and transmitted to the 14th dichroic mirror (724). The merged light beam passes through the third filter (725), the second BBO crystal (726), the 23rd convex lens (727), and the fourth filter (728), and is transmitted through the fourth filter (728) to the 15th dichroic mirror (734). The light pulse is transmitted through the 15th dichroic mirror (734) to the third BBO crystal (735).The light pulse output from the other output end of the second beam splitter (709) is incident on the eighty-fifth reflector (729) via the third adjustable aperture (736). The light pulse is reflected by the eighty-fifth reflector (729) to the eighty-sixth reflector (730), and then reflected by the eighty-sixth reflector (730) to the eighty-seventh reflector (731). After being reflected by the eighty-seventh reflector (731), the light pulse passes sequentially through the twenty-fourth convex lens (732) and the fifteenth half-wave plate (733). The light pulse is transmitted through the fifteenth half-wave plate (733) to the fifteenth dichroic mirror (734), and is reflected by the fifteenth dichroic mirror (734), where it merges with the light pulse transmitted through the fifteenth dichroic mirror (734). The merged light pulse is then transmitted to the third BBO crystal (735) and output through the third BBO crystal (735).

Images