A high-energy pure-quartic mamyshev oscillator optical soliton generation system

Abstract

The high-energy pure quartic Mamyshev oscillator optical soliton generation system belongs to the technical field of optoelectronic devices, and has the structure that the output end of a seed source (1) is connected with the input end of a Mamyshev oscillator (2), and the output end of a pulse shaping device (3) is connected with the input end of the Mamyshev oscillator (2); the output end of the Mamyshev oscillator (2) is connected with the input end of a pulse expansion module (4), the output end of the pulse expansion module (4) is connected with the input end of an amplifier (5), and the output end of the amplifier (5) is connected with the input end of a compressor (6). The grating, the concave mirror and the spatial light modulator are used to design the pulse shaping device, so that the high-order dispersion of the Mamyshev oscillator is accurately managed, the stable output of the pure quartic soliton pulse is achieved, and the shape of the pure quartic soliton pulse is ensured to remain unchanged while the width of the pure quartic soliton pulse is effectively compressed and the energy of the pure quartic soliton pulse is greatly improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of optoelectronic devices, and particularly relates to a high-energy pure quartic Mamyshev oscillator optical soliton generation system. BACKGROUND

[0002] In today's era of rapid technological development, high-energy femtosecond pulses have shown indispensable importance in many key fields. At present, the main way to obtain femtosecond pulses in fiber lasers is passive mode-locking technology. However, the energy of the pulses generated by this technology is limited by the accumulation of nonlinear phase shift, which makes it difficult to meet the growing demand of practical applications. At the same time, with the continuous progress of technology, the requirements for laser performance in various fields continue to increase, and in the new development stage, more stringent standards are put forward for the pulse energy of femtosecond fiber lasers. Therefore, it is urgent to develop new technical means to further improve the energy of femtosecond pulses.

[0003] Mamyshev fiber laser as a new type of fiber laser structure brings new opportunities for improving pulse energy. It skillfully uses the intracavity nonlinear effect to break through the limitation of intracavity nonlinear phase shift accumulation, and can greatly improve the pulse energy to more than 150nJ. More importantly, when pure quartic solitons are generated using Mamyshev fiber lasers, the limitation of soliton area theory can also be broken. Soliton area theory to some extent restricts the further improvement of soliton pulse energy, and the appearance of pure quartic solitons provides the possibility to break this restriction. In theory, pure quartic solitons can further significantly improve the pulse energy, thereby opening up a wider space for the application of high-energy femtosecond pulses.

[0004] However, in actual application, the pure quartic solitons directly output from the intracavity have obvious limitations, and their pulse energy is still low, far from meeting the urgent demand for high-energy femtosecond pulses in actual production and life. In order to solve this problem, researchers have begun to consider improving the energy of pure quartic solitons by constructing an extracavity system. However, the existing extracavity system designs are mostly not specifically designed for pure quartic solitons, and there are many deficiencies in improving the energy of pure quartic solitons, which cannot effectively realize the significant improvement of the energy of pure quartic solitons.

[0005] In summary, the existing systems for improving the energy of soliton pulses are not suitable for pure quartic solitons, and there are still many technical problems to be solved in improving the energy of pure quartic solitons, so it is necessary to further improve the related technology and develop a system that can effectively improve the energy of Mamyshev oscillator pure quartic solitons. SUMMARY

[0006] The pure fourth-order soliton directly output in the background art has low energy, and the existing cavity-out system is not designed for the pure fourth-order soliton, and has obvious defects in improving the energy of the pure fourth-order soliton, and the application provides a high-energy pure fourth-order Mamyshev oscillator optical soliton generation system.The system obtains high-energy pure fourth-order soliton pulses through a pulse expansion module, an amplifier and a compressor.

[0007] The application achieves the purpose by the following technical scheme.

[0008] A high-energy pure fourth-order Mamyshev oscillator optical soliton generation system has the structure that the output end of a seed source 1 is connected with the input end of a Mamyshev oscillator 2, and the output end of a pulse shaping device 3 is connected with the input end of the Mamyshev oscillator 2; the output end of the Mamyshev oscillator 2 is connected with the input end of a pulse expansion module 4, the output end of the pulse expansion module 4 is connected with the input end of an amplifier 5, and the output end of the amplifier 5 is connected with the input end of a compressor 6; the seed source 1 adopts a passive mode-locked fiber laser resonant cavity based on the nonlinear polarization rotation principle; the pulse shaping device 3 is cooperatively built by a grating, a high-reflectivity concave mirror and a spatial light modulator, can be accurately adjusted, and ensures that the Mamyshev oscillator 2 stably outputs pure fourth-order solitons; the pulse expansion module 4 builds an initial collimation system by a convex lens group, realizes spectrum widening in cooperation with the diffraction characteristics of a grating, sets a polarization beam splitter and a mirror array in an optical path to form a multi-channel transmission link, makes the optical pulse complete multiple reflection-refraction cycles in free space, and is finally output through a mirror; the amplifier 5 utilizes a Faraday rotator and a polarization beam splitter to form an optical isolation unit, realizes polarization state matching in cooperation with a wave plate, amplifies the optical pulse in a gain fiber, and separates the amplified signal from the remaining pump light through the wave separation characteristics of a dichroic mirror; the compressor 6 utilizes a polarizer and a wave plate to form a polarization modulation unit, makes the optical pulse complete dynamic compensation of group velocity dispersion and high-order dispersion in the reflection transmission process, and finally realizes time-domain compression output through a dichroic mirror.

[0009] The seed source 1 has the structure that a first pump 101 is connected with the 980nm end of a first wavelength division multiplexer 102, one end of the first wavelength division multiplexer 102 is connected with one end of a first erbium-doped fiber 103, the other end of the first erbium-doped fiber 103 is connected with the input end of a first coupler 104, the 90% output end of the first coupler 104 is connected with the input end of a first optical fiber isolator 105, the output end of the first optical fiber isolator 105 is connected with one end of a three-ring polarization controller 106, the other end of the three-ring polarization controller 106 is connected with one end of a first polarizer 107, the other end of the first polarizer 107 is connected with the common end of the first wavelength division multiplexer 102, and optical pulses are output from the 10% output end of the first coupler 104.

[0010] The Mamyshev oscillator 2 is structured as follows: the second pump 201 is connected with the 980nm end of the second wavelength division multiplexer 202, the 1550nm end of the second wavelength division multiplexer 202 is connected with one end of the second erbium-doped fiber 203, the other end of the second erbium-doped fiber 203 is connected with the input end of the second fiber isolator 204, the output end of the second fiber isolator 204 is connected with the input end of the pulse shaping device 3, the output end of the pulse shaping device 3 is connected with the input end of the second coupler 205, the 90% output end of the second coupler 205 is connected with the input end of the first filter 206, the output end of the first filter 206 is connected with the common end of the third wavelength division multiplexer 208, the 980nm end of the third wavelength division multiplexer 208 is connected with the third pump 207, the 1550nm end of the third wavelength division multiplexer 208 is connected with one end of the third erbium-doped fiber 209, the other end of the third erbium-doped fiber 209 is connected with one end of the first squeezed polarization controller 210, the other end of the first squeezed polarization controller 210 is connected with the input end of the third fiber isolator 211, the output end of the third fiber isolator 211 is connected with the input end of the second filter 212, the output end of the second filter 212 is connected with the input end of the third coupler 213, the light pulse from the seed source 1 enters the Mamyshev oscillator 2 through the input end of the third coupler 213, and the light pulse is output from the 10% output end of the second coupler 205.

[0011] The pulse shaping device 3 is structured as follows: the light pulse is transmitted to the first grating 302 through the first convex lens 301, the first grating 302 transmits the light pulse to the first concave mirror 303, and then the light pulse is reflected to the first spatial light modulator 304, the first spatial light modulator 304 reflects the light pulse back to the first concave mirror 303, the light pulse is reflected back to the first grating 302 through the first concave mirror 303, and then the light pulse is reflected to the second convex lens 305 through the first grating 302, and finally the light pulse is output through the second convex lens 305.

[0012] The pulse expansion module 4 is structured as follows: the light pulse is transmitted to the first plano-convex lens 402 through the third convex lens 401, the first plano-convex lens 402 transmits the light pulse to the first polarization beam splitter 403, the light pulse is transmitted to the first alignment sheet 404 through the port perpendicular to the incident direction of the first polarization beam splitter 403, the light pulse is transmitted to the first mirror 406 through the first alignment sheet 404, the first mirror 406 transmits the light pulse to the third grating 410, the third grating 410 transmits the light pulse to the first convex mirror 408, the first convex mirror 408 transmits the light pulse to the second concave mirror 409, the light pulse is reflected back to the first convex mirror 408 through the second concave mirror 409, the first convex mirror 408 transmits the light pulse to the third grating 410, and the light pulse is reflected back to the third grating 410 through the first roof prism 407, the light pulse is reflected back to the third grating 410 through the first convex mirror 408 and the second concave mirror 409, the third grating 410 transmits the pulse to the second mirror 405, the second mirror 405 transmits the light pulse to the second alignment sheet 411, the light pulse is transmitted to the second polarization beam splitter 412 through the second alignment sheet 411, the light pulse is transmitted to the first concave cylindrical lens 413 through the port perpendicular to the incident direction of the second polarization beam splitter 412, the first concave cylindrical lens 413 transmits the light pulse to the fourth convex lens 414, the fourth convex lens 414 transmits the light pulse to the first half-wave plate 415, the first half-wave plate 415 transmits the light pulse to the input end of the first spatial light isolator 416, the light pulse is transmitted from the output end of the first spatial light isolator 416 to the third mirror 417, and the light pulse is reflected to the fourth mirror 418 output through the third mirror 417.

[0013] The amplifier 5 is structured that the light pulse is transmitted to the second half wave plate 502 through the fifth mirror 501, the second half wave plate 502 transmits the light pulse to the third polarization beam splitter 503, the light pulse is transmitted to the first modulator 504 through the port parallel to the incident direction of the third polarization beam splitter 503, the first modulator 504 transmits the light pulse to the third half wave plate 505, the third half wave plate 505 transmits the light pulse to the fourth polarization beam splitter 506, the fourth polarization beam splitter 506 transmits the pulse to the sixth mirror 507, the sixth mirror 507 transmits the light pulse to the second plano-convex lens 508, the second plano-convex lens 508 transmits the light pulse to the third plano-convex lens 509, the third plano-convex lens transmits the light pulse to the seventh mirror 510, the seventh mirror 510 transmits the light pulse to the fifth polarization beam splitter 511, the light pulse is transmitted to the first Faraday rotator 512 through the port parallel to the incident light of the fifth polarization beam splitter 511, the first Faraday rotator 512 transmits the light pulse to the fourth half wave plate 513, the fourth half wave plate 513 transmits the light pulse to the eighth mirror 514, the eighth mirror 514 transmits the light pulse to the first collimator 515, the light pulse is transmitted to the fourth erbium-doped fiber 516 through the first collimator 515, the fourth erbium-doped fiber 516 transmits the light pulse to the second collimator 517, the light pulse is transmitted to the fifth convex lens 518 through the second collimator 517, and is reflected to the fourth plano-convex lens 523 through the first dichroic mirror 519 perpendicular to the incident light, the light output by the fourth pump 522 is transmitted to the sixth convex lens 520 through the third collimator 521, enters the light path through the first dichroic mirror 519, is transmitted to the fourth erbium-doped fiber 516 through the fifth convex lens 518 and the second collimator 517, and is transmitted to the fourth plano-convex lens 523 through the second collimator 517, the fifth convex lens 518 and the first dichroic mirror 519, the fourth plano-convex lens 523 transmits the light pulse to the fifth plano-convex lens 524, the fifth plano-convex lens 524 transmits the light pulse to the third collimating sheet 525, the light pulse is transmitted to the sixth plano-convex lens 526 through the third collimating sheet 525, the sixth plano-convex lens 526 transmits the light pulse to the ninth mirror 527, the light pulse is transmitted to the tenth mirror 528 through the ninth mirror 527, the tenth mirror 528 transmits the light pulse to the second Faraday rotator 529, the second Faraday rotator 529 transmits the light pulse to the fifth half wave plate 530, the fifth half wave plate 530 transmits the light pulse to the seventh plano-convex lens 531, the seventh plano-convex lens 531 transmits the light pulse to the eighth plano-convex lens 532, the eighth plano-convex lens 532 transmits the light pulse to the second dichroic mirror 533, the light pulse is transmitted to the first photodiode 534 through the second dichroic mirror 533, is transmitted to the eleventh mirror 535 through the first photodiode 534, the eleventh mirror 535 transmits the light pulse to the twelfth mirror 536,The light pulse is transmitted to the ninth plano-convex lens 537 through the twelfth mirror 536, and the ninth plano-convex lens 537 transmits the light pulse to the tenth plano-convex lens 538, and the tenth plano-convex lens 538 transmits the light pulse to the second photodiode 539, and the light pulse is transmitted to the third Faraday rotator 540 through the second photodiode 539, and the third Faraday rotator 540 transmits the light pulse to the thirteenth mirror 541, and the light pulse is transmitted to the second dichroic mirror 533 through the thirteenth mirror 541, the third Faraday rotator 540, the second photodiode 539, the tenth plano-convex lens 538, the ninth plano-convex lens 537, the twelfth mirror 536, the eleventh mirror 535, the first photodiode 534, and the light pulse is output from the second dichroic mirror 533.

[0014] The compressor 6 is structured that the light pulse is transmitted to the first triangular prism 602 through the fourteenth mirror 601, the first triangular prism 602 transmits the light pulse to the second triangular prism 603, the second triangular prism 603 transmits the light pulse to the fifteenth mirror 604, the light pulse is reflected through the fifteenth mirror 604, transmitted through the second triangular prism 603 and the first triangular prism 602 to the third dichroic mirror 605, the third dichroic mirror 605 transmits the light pulse to the sixteenth mirror 606, the sixteenth mirror 606 transmits the light pulse to the first polarizer 607, the first polarizer 607 transmits the light pulse to the sixth half-wave plate 608, the sixth half-wave plate 608 transmits the light pulse to the input end of the second spatial light isolator 609, the light pulse is transmitted to the seventh half-wave plate 610 through the output end of the second spatial light isolator 609, transmitted to the first quarter-wave plate 611 through the seventh half-wave plate 610, the first quarter-wave plate 611 transmits the light pulse to the second polarizer 612, the second polarizer 612 transmits the light pulse to the seventeenth mirror 613, the seventeenth mirror 613 transmits the light pulse to the fourth dichroic mirror 614, the fourth dichroic mirror 614 transmits the light pulse to the eighteenth mirror 615, the eighteenth mirror 615 transmits the light pulse to the eighth half-wave plate 616, the light pulse is transmitted to the fourth grating 618 through the fifth dichroic mirror 617, the fourth grating 618 transmits the light pulse to the fifth grating 619, the fifth grating 619 transmits the light pulse to the nineteenth mirror 620, the light pulse is reflected through the nineteenth mirror 620, transmitted through the fifth grating 619 and the fourth grating 618 to the fifth dichroic mirror 617, and the light pulse is output from the fifth dichroic mirror 617.

[0015] Beneficial effects:

[0016] 1. The application utilizes the grating, the concave mirror and the spatial light modulator to design the pulse shaping device to perform the high-order dispersion management of the Mamyshev oscillator, and realizes the pure fourth-order soliton pulse output.

[0017] 2, The application utilizes the pulse expansion module to expand the pure quartic soliton pulse, and effectively improves the stability of the pure quartic soliton output by the Mamyshev oscillator.

[0018] 3, The application utilizes the amplifier and the compressor to amplify and compress the pure quartic soliton, realizes the improvement of the pure quartic soliton energy and the compression of the pulse width, and ensures that the shape of the pure quartic soliton is unchanged. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the overall principle diagram of the application.

[0020] Figure 2 It is a seed source optical path diagram used by the application.

[0021] Figure 3 It is a Mamyshev oscillator optical path diagram used by the application.

[0022] Figure 4 It is a pulse shaping device optical path diagram used by the application.

[0023] Figure 5 It is a pulse expansion module optical path diagram used by the application.

[0024] Figure 6 It is an amplifier optical path diagram used by the application.

[0025] Figure 7 It is a compressor optical path diagram used by the application.

[0026] Figure 8 It is a pulse spectrum diagram of the Mamyshev oscillator 2 output by the application.

[0027] Figure 9 It is a pulse waveform diagram of the Mamyshev oscillator 2 output by the application.

[0028] Figure 10 It is a pulse spectrum diagram of the compressor 6 output by the application.

[0029] Figure 11 It is a pulse waveform diagram of the compressor 6 output by the application. DETAILED DESCRIPTION

[0030] The working principle of the application will be further described below in combination with the drawings, and it should be understood that the components parameters marked in the drawings are preferred parameters used in the following embodiments, and are not a limitation on the protection scope of the application.

[0031] Example 1 Overall structure of the application

[0032] As Figure 1As shown, the overall structure of the present invention includes: the output terminal of seed source 1 is connected to the input terminal of Mamyshev oscillator 2; the output terminal of pulse shaping device 3 is connected to the input terminal of Mamyshev oscillator 2; the output terminal of Mamyshev oscillator 2 is connected to the input terminal of pulse expansion module 4; the output terminal of pulse expansion module 4 is connected to the input terminal of amplifier 5; and the output terminal of amplifier 5 is connected to the input terminal of compressor 6.

[0033] Example 2 Seed Source

[0034] The optical path structure of the seed source 1 is as follows: Figure 2 As shown: The first pump 101 (pump source, center wavelength 980nm, maximum single-mode output optical power 750mW) is connected to the 980nm end of the first wavelength division multiplexer 102 (980 / 1550nm single-mode fiber wavelength division multiplexer). The 1550nm end of the first wavelength division multiplexer 102 is connected to one end of the first erbium-doped fiber 103 (SM-ESF-7 / 125 erbium-doped fiber). The other end of the first erbium-doped fiber 103 is connected to the first coupler 104 (1550nm). The first coupler 104 is connected to the input of a 1×2 single-mode fiber tapered coupler. 90% of the output of the first coupler 104 is connected to the input of a first fiber isolator 105 (a 1550nm polarization-independent fiber isolator). The output of the first fiber isolator 105 is connected to one end of a three-ring polarization controller 106 (56mm ring diameter). The other end of the three-ring polarization controller 106 is connected to one end of a first polarizer 107 (a 1550nm fiber polarizer). The other end of the first polarizer 107 is connected to the common terminal of a first wavelength division multiplexer 102. Optical pulses are output from the 10% output of the first coupler 104.

[0035] Example 3: Mamyshev Oscillator

[0036] The optical path structure of the Mamyshev oscillator 2 is as follows: Figure 3The second pump 201 (pump source, central wavelength 980 nm, maximum single-mode output optical power 750 mW) is connected to the 980 nm end of the second wavelength division multiplexer 202 (980 / 1550 nm single-mode fiber wavelength division multiplexer), the 1550 nm end of the second wavelength division multiplexer 202 is connected to one end of the second erbium-doped fiber 203 (EDFC-980-HP erbium-doped fiber), the other end of the second erbium-doped fiber 203 is connected to the input end of the second fiber isolator (1550 nm polarization-independent fiber isolator) 204, the output end of the second fiber isolator 204 is connected to the input end of the pulse shaping device 3, the output end of the pulse shaping device 3 is connected to the input end of the second coupler 205 (1×2 single-mode fiber taper coupler of 1550 nm), the 90% output end of the second coupler 205 is connected to the input end of the first filter 206 (1530 nm tunable filter), the output end of the first filter 206 is connected to the common end of the third wavelength division multiplexer 208 (980 / 1550 nm single-mode fiber wavelength division multiplexer), the 980 nm end of the third wavelength division multiplexer 208 is connected to the third pump 207 (pump source, central wavelength 980 nm, maximum single-mode output optical power 750 mW), the 1550 nm end of the third wavelength division multiplexer 208 (980 / 1550 nm single-mode fiber wavelength division multiplexer) is connected to one end of the third erbium-doped fiber 209 (EDFC-980-HP erbium-doped fiber), the other end of the third erbium-doped fiber 209 is connected to one end of the first squeeze-type polarization controller 210 (squeeze-type polarization controller), the other end of the first squeeze-type polarization controller 210 is connected to the input end of the third fiber isolator 211 (1550 nm polarization-independent fiber isolator), the output end of the third fiber isolator 211 is connected to the input end of the second filter 212 (1530 nm tunable filter), the output end of the second filter 212 is connected to the input end of the third coupler 213 (2×2 single-mode fiber taper coupler of 1550 nm), the optical pulses from the seed source 1 enter the Mamyshev oscillator 2 through the input end of the third coupler 213, and the optical pulses are output from the 10% output end of the second coupler 205.

[0037] Example 4 Pulse shaping device

[0038] The optical path structure of the pulse shaping device 3 is as shown in Figure 4As shown: the light pulse is transmitted to the first grating 302 (flat engraved diffraction grating) through the first convex lens 301 (GLA12-020-030 convex lens), the first grating 302 transmits the light pulse to the first concave mirror 303 (GMH13-025-020-AG concave mirror), and then reflects to the first spatial light modulator 304 (SLM-256-NIR spatial light modulator), the first spatial light modulator 304 reflects the light pulse back to the first concave mirror 303, the light pulse is reflected by the first concave mirror 303 back to the first grating 302 (GP3506Z grating), and then reflected by the first grating 302 to the second convex lens 305 (GLA12-020-030 convex lens), and finally output through the second convex lens 305.

[0039] Example 5 Pulse expansion module

[0040] The optical path structure of the pulse expansion module 4 is as shown in Figure 5As shown: the light pulse is transmitted to the first plano-convex lens 402 (GLA11-025-025-C film plano-convex lens) through the third convex lens 401 (GLA12-020-030 convex lens), the first plano-convex lens 402 transmits the light pulse to the first polarization beam splitter 403 (VPBS644 polarization beam splitter), the light pulse is transmitted to the first alignment sheet 404 (ground glass alignment sheet) through the port perpendicular to the incident direction of the first polarization beam splitter 403, the light pulse is transmitted to the first mirror 406 (broadband dielectric film mirror) through the first alignment sheet 404, the first mirror 406 transmits the light pulse to the third grating 410 (GP3506Z grating), the third grating 410 transmits the light pulse to the first convex mirror 408 (convex mirror), the first convex mirror 408 transmits the light pulse to the second concave mirror 409 (GMH-13 concave mirror), the light pulse is reflected back to the first convex mirror 408 through the second concave mirror 409, the first convex mirror 408 transmits the light pulse to the third grating 410, and then the light pulse is reflected back to the third grating 410 through the first roof prism 407 (GPH15-020 roof prism), the light pulse is reflected back to the third grating 410 through the first convex mirror 408 and the second concave mirror 409, the third grating 410 transmits the light pulse to the second mirror 405 (broadband dielectric film mirror), the second mirror 405 transmits the light pulse to the second alignment sheet 411 (ground glass alignment sheet), the light pulse is transmitted to the second polarization beam splitter 412 (VPBS644 polarization beam splitter) through the second alignment sheet 411, the light pulse is transmitted to the first concave cylindrical lens 413 (GLH16-20x10-004-SWIR concave cylindrical lens) through the port perpendicular to the incident direction of the second polarization beam splitter 412, the first concave cylindrical lens 413 transmits the light pulse to the fourth convex lens 414 (GLA12-020-030 convex lens), the fourth convex lens 414 transmits the light pulse to the first half-wave plate 415 (MHWP20-1550BM half-wave plate), the first half-wave plate 415 transmits the light pulse to the input end of the first spatial light isolator 416 (ISO1550-3-5W spatial light isolator), the light pulse is transmitted from the output end of the first spatial light isolator 416 to the third mirror 417 (broadband dielectric film mirror), and the light pulse is reflected to the fourth mirror 418 output through the third mirror 417.

[0041] Example 6 Amplifier

[0042] The optical path structure of the amplifier 5 is as shown in Figure 6The light pulse is transmitted to the second half wave plate 502 (MHWP20-1550BM half wave plate) through the fifth mirror 501 (BDM2-C broadband dielectric mirror), the second half wave plate 502 transmits the light pulse to the third polarization beam splitter 503 (VPBS644 polarization beam splitter), the light pulse is transmitted to the first modulator 504 (EOPM-20M-C modulator) through the port parallel to the incident direction of the third polarization beam splitter 503, the first modulator 504 transmits the light pulse to the third half wave plate 505 (MHWP20-1550BM half wave plate), the third half wave plate 505 transmits the light pulse to the fourth polarization beam splitter 506 (VPBS644 polarization beam splitter), the fourth polarization beam splitter 506 transmits the pulse to the sixth mirror 507 (BDM2-C broadband dielectric mirror), the sixth mirror 507 (broadband dielectric mirror) transmits the light pulse to the second plano-convex lens 508 (GLA11-025-025-C film plano-convex lens), the second plano-convex lens 508 transmits the light pulse to the third plano-convex lens 509 (GLA11-025-025-C film plano-convex lens), the third plano-convex lens transmits the light pulse to the seventh mirror 510 (broadband dielectric mirror), the seventh mirror 510 transmits the light pulse to the fifth polarization beam splitter 511 (VPBS644 polarization beam splitter), the light pulse is transmitted to the first Faraday rotator 512 (I1550R5 Faraday rotator) through the port parallel to the incident light of the fifth polarization beam splitter 511 (VPBS644 polarization beam splitter), the first Faraday rotator 512 transmits the light pulse to the fourth half wave plate 513 (MHWP20-1550BM half wave plate), the fourth half wave plate 513 transmits the light pulse to the eighth mirror 514 (broadband dielectric mirror), the eighth mirror 514 transmits the light pulse to the first collimator 515 (RFCAG-1.8-APC collimator), the light pulse is transmitted to the fourth erbium-doped fiber 516 (SM-ESF-7 / 125 erbium-doped fiber) through the first collimator 515, the fourth erbium-doped fiber 516 transmits the light pulse to the second collimator 517 (RFCAG-1.8-APC collimator), the light pulse is transmitted to the fifth convex lens 518 (GLA12-020-030 convex lens) through the second collimator 517, and is reflected to the fourth plano-convex lens 523 (GLA11-025-025-C film plano-convex lens) through the first dichroic mirror 519 (DMLP1500R dichroic mirror) perpendicular to the incident light, the light output by the fourth pump 522 (pump source, center wavelength 980nm, maximum single-mode output optical power 750mW) is transmitted to the sixth convex lens 520 (GLA12-020-030 convex lens) through the third collimator 521 (RFCAG-1.8-APC collimator), and enters the light path through the first dichroic mirror 519,The light pulse is transmitted through the fifth convex lens 518 and the second collimator 517 to the fourth erbium-doped fiber 516. Then, it is transmitted through the second collimator 517, the fifth convex lens 518, and the first dichroic mirror 519 to the fourth plano-convex lens 523 (GLA11-025-025-C film plano-convex lens). The fourth plano-convex lens 523 transmits the light pulse to the fifth plano-convex lens 524 (GLA11-025-025-C film plano-convex lens). The fifth plano-convex lens 524 transmits the light pulse to the third alignment plate 525 (ground glass alignment plate). The light pulse is then transmitted through the third alignment plate 525 to the sixth plano-convex lens 526 (GLA11-025-025-C film plano-convex lens). The sixth plano-convex lens 526 transmits the light pulse to the ninth reflecting mirror 52. The light pulse is transmitted via the ninth mirror 527 to the tenth mirror 528 (BDM2-C broadband dielectric film mirror). The tenth mirror 528 transmits the light pulse to the second Faraday rotator 529 (I1550R5 Faraday rotator). The second Faraday rotator 529 transmits the light pulse to the fifth half-wave plate 530 (MHWP20-1550BM half-wave plate). The fifth half-wave plate 530 transmits the light pulse to the seventh plano-convex lens 531 (GLA11-025-025-C film plano-convex lens). The seventh plano-convex lens 531 transmits the light pulse to the eighth plano-convex lens 532 (GLA11-025-025-C film plano-convex lens). The eighth plano-convex lens 532 transmits the light pulse to the second dichroic mirror 533 (DMLP1500R dichroic mirror). The light pulse is then transmitted via the second dichroic mirror 533 to the first photodiode 534 (D4F2P22-976 photodiode), and then via the first photodiode 534 to the eleventh reflector 535 (BDM2-C broadband dielectric film reflector). The eleventh reflector 535 transmits the light pulse to the twelfth reflector 536 (BDM2-C broadband dielectric film reflector), and then via the twelfth reflector 536 to the ninth plano-convex lens 537 (GLA11-025-025-C film plano-convex lens). The ninth plano-convex lens 537 transmits the light pulse to the tenth plano-convex lens 538 (GL... On the A11-025-025-C plano-convex lens, the tenth plano-convex lens 538 transmits the light pulse to the second photodiode 539 (D4F2P22-976 photodiode). The light pulse is then transmitted via the second photodiode 539 to the third Faraday rotator 540 (I1550R5 Faraday rotator). The third Faraday rotator 540 transmits the light pulse to the thirteenth reflecting mirror 541 (broadband dielectric film reflecting mirror). The light pulse then travels through the thirteenth reflecting mirror 541, the third Faraday rotator 540, the second photodiode 539, the tenth plano-convex lens 538, the ninth plano-convex lens 537, the twelfth reflecting mirror 536, the eleventh reflecting mirror 535, and the first photodiode 534 back to the second dichroic mirror 533.The light pulse is output from the second dichroic mirror 533.

[0043] Example 7 Compressor

[0044] The optical path structure of compressor 6 is as follows Figure 7 As shown: The light pulse is transmitted through the fourteenth reflecting mirror 601 (broadband dielectric film reflecting mirror) to the first prism 602 (GPH13-005 prism). The first prism 602 transmits the light pulse to the second prism 603 (GPH13-005 prism). The second prism 603 transmits the light pulse to the fifteenth reflecting mirror 604 (broadband dielectric film reflecting mirror). The light pulse is reflected by the fifteenth reflecting mirror 604, passes through the second prism 603, and is transmitted by the first prism 602 to the third dichroic mirror 605 (dichroic mirror). The third dichroic mirror 605 transmits the light pulse to the sixteenth reflecting mirror 606 (broadband dielectric film reflecting mirror). The sixteenth reflector 606 transmits the light pulse to the first polarizer 607 (FLP51-NIR-M polarizer), which in turn transmits it to the sixth half-wave plate 608 (MHWP20-1550BM half-wave plate). The sixth half-wave plate 608 then transmits the light pulse to the input of the second spatial optical isolator 609 (ISO1550-3-5W spatial optical isolator). The light pulse is then transmitted through the output of the second spatial optical isolator 609 to the seventh half-wave plate 610 (MHWP20-1550BM half-wave plate). The light pulse is transmitted to the first quarter-wave plate 611 (QWPSM05-1550B quarter-wave plate), which then transmits it to the second polarizer 612 (FLP51-NIR-M polarizer). The second polarizer 612 transmits the light pulse to the seventeenth mirror 613 (BDM2-C broadband dielectric film mirror), which then transmits it to the fourth dichroic mirror 614 (DMLP1500R dichroic mirror). The fourth dichroic mirror 614 transmits the light pulse to the eighteenth mirror 615 (BDM2-C broadband dielectric film mirror), which then transmits it to the first quarter-wave plate 611 (QWPSM05-1550B quarter-wave plate). The eighteenth mirror 615 transmits the light pulse to the first quarter-wave plate 611 (QWPSM05-1550B quarter-wave plate). The first quarter-wave plate 611 transmits the light pulse to the second polarizer 612 (FLP51-NIR-M polarizer), which then transmits it to the seventeenth mirror 613 (BDM2-C broadband dielectric film mirror), which then transmits it to the first dichroic mirror 614 (DMLP1500R dichroic mirror). The fourth dichroic mirror 614 transmits the light pulse to the eighteenth mirror 615 (BDM2-C broadband dielectric film mirror), which then transmits it to the first dichroic mirror 615 (BDM2-C broadband dielectric film mirror). The eighteenth mirror 615 transmits the light pulse to the first dichroic mirror 61 ... The light pulse is transmitted to the eighth half-wave plate 616 (MHWP20-1550BM half-wave plate), and then transmitted to the fourth grating 618 (GP3506Z grating) via the fifth dichroic mirror 617 (DMLP1500R dichroic mirror). The fourth grating 618 transmits the light pulse to the fifth grating 619 (GP3506Z grating), and then to the nineteenth reflector 620 (broadband dielectric film reflector). The light pulse is reflected by the nineteenth reflector 620, and then transmitted to the fifth dichroic mirror 617 via the fifth grating 619 and the fourth grating 618. The light pulse is then output from the fifth dichroic mirror 617.

[0045] Example 8: Working principle of the present invention

[0046] The working principle of the present application is described in combination with the above embodiments and the accompanying drawings.

[0047] The seed source 1 adopts a traditional mode-locked fiber laser resonant cavity to generate optical pulses, thereby starting the Mamyshev oscillator 2. The pulse shaping device composed of the first grating 302, the first concave mirror 303 and the first spatial light modulator 304 can perform high-order dispersion management on the laser cavity, thereby making the Mamyshev oscillator 2 output pure quartic solitons. The pulse expansion module 4 uses the combination of a grating and an optical lens to perform expansion processing on the pure quartic soliton pulses. This operation not only effectively improves the stability of the pure quartic solitons output by the Mamyshev oscillator 2, but also creates conditions for the operation of the subsequent amplifier 5, so that it can obtain higher pulse energy in the subsequent structure. The amplifier 5 performs amplification operation on the pure quartic solitons, thereby improving the energy level of the pure quartic solitons. Then, the compressor 6 performs compression processing on the pure quartic solitons, thereby reducing the pulse width of the pure quartic solitons while ensuring that the shape of the pure quartic solitons remains unchanged. Since the energy of the pure quartic solitons is proportional to the negative third power of the pulse width, the reduction of the pulse width further promotes the increase of the pulse energy, and finally realizes the output of high-energy pulses.

[0048] Figure 8 is the spectral waveform and sideband position of the pulse output by the Mamyshev oscillator 2; Figure 9 is the time-domain waveform of the pulse output by the Mamyshev oscillator 2, and the time-domain waveform has a shaking tail, which is consistent with the spectral waveform of Figure 8 , it can be judged that the Mamyshev oscillator 2 outputs pure quartic solitons, and the peak power of the pure quartic solitons is 6.55kW, the pulse width is 1.5ps, and the calculated energy is 9.825nJ. Figure 10 is the pulse spectral waveform and sideband position after expansion, amplification and compression by the pulse expansion module 4, the amplifier 5 and the compressor 6; Figure 11 is the pulse time-domain waveform after expansion, amplification and compression by the pulse expansion module 4, the amplifier 5 and the compressor 6. The time-domain waveform has a shaking tail, which is consistent with the spectral waveform of Figure 10 , it can be seen that the pulse after expansion, amplification and compression by the pulse expansion module 4, the amplifier 5 and the compressor 6 is still a pure quartic soliton, and at this time the peak power is 94.2kW, the pulse width is 700fs, and the calculated energy is 65.94nJ. In the present application, the energy of the pure quartic solitons output by the Mamyshev oscillator is significantly enhanced, and the energy is increased by about 7 times compared with the direct output of the Mamyshev oscillator.

Claims

1. A high-energy pure fourth-order Mamyshev oscillator optical soliton generation system, comprising: the output of a seed source (1) connected to the input of a Mamyshev oscillator (2); the output of a pulse shaping device (3) connected to the input of the Mamyshev oscillator (2); the output of the Mamyshev oscillator (2) connected to the input of a pulse expansion module (4); the output of the pulse expansion module (4) connected to the input of an amplifier (5); and the output of the amplifier (5) connected to the input of a compressor (6); characterized in that, The seed source (1) adopts a passive mode-locked fiber laser resonator based on the principle of nonlinear polarization rotation; the pulse shaping device (3) is constructed from a grating, a high-reflectivity concave mirror and a spatial light modulator to ensure that the Mamyshev oscillator (2) outputs pure fourth solitons stably; the pulse expansion module (4) is constructed from a convex lens group to form an initial collimation system, and the spectral broadening is achieved in conjunction with the diffraction characteristics of the grating. A polarization beam splitter and a mirror array are set in the optical path to form a transmission link, so that the light pulse completes multiple reflection-refraction cycles in free space and is finally output through the mirror; the amplifier (5) uses a Faraday rotator and a polarization beam splitter to form an optical isolation unit, and a waveplate is used to achieve polarization state matching. The light pulse is amplified in the gain fiber, and the amplified signal is separated from the remaining pump light by the wave splitting characteristics of the dichroic mirror; the compressor (6) uses a polarizer and a waveplate to form a polarization modulation unit, so that the light pulse completes dynamic compensation of group velocity dispersion and higher-order dispersion during reflection transmission, and finally achieves time-domain compressed output through the dichroic mirror; The structure of the Mamyshev oscillator (2) is as follows: the second pump (201) is connected to the 980nm end of the second wavelength division multiplexer (202); the 1550nm end of the second wavelength division multiplexer (202) is connected to one end of the second erbium-doped fiber (203); the other end of the second erbium-doped fiber (203) is connected to the input end of the second fiber isolator (204); the output end of the second fiber isolator (204) is connected to the input end of the pulse shaping device (3); the output end of the pulse shaping device (3) is connected to the input end of the second coupler (205); the 90% output end of the second coupler (205) is connected to the input end of the first filter (206); the output end of the first filter (206) is connected to the common end of the third wavelength division multiplexer (208); and the third wavelength division multiplexer (208) is connected to the common end of the third wavelength division multiplexer (208). The 980nm end of the third wave division multiplexer (208) is connected to the third pump (207), the 1550nm end of the third wave division multiplexer (208) is connected to one end of the third erbium-doped fiber (209), the other end of the third erbium-doped fiber (209) is connected to one end of the first squeeze polarization controller (210), the other end of the first squeeze polarization controller (210) is connected to the input end of the third fiber isolator (211), the output end of the third fiber isolator (211) is connected to the input end of the second filter (212), the output end of the second filter (212) is connected to the input end of the third coupler (213), the light pulse from the seed source (1) enters the Mamyshev oscillator (2) through the input end of the third coupler (213), and the light pulse is output from the 10% output end of the second coupler (205); The structure of the pulse shaping device (3) is as follows: the light pulse is transmitted to the first grating (302) through the first convex lens (301), the first grating (302) transmits the light pulse to the first concave mirror (303) and then reflects it to the first spatial light modulator (304). The first spatial light modulator (304) reflects the light pulse back to the first concave mirror (303), the light pulse is reflected back to the first grating (302) through the first concave mirror (303), and then reflected by the first grating (302) to the second convex lens (305), and finally output through the second convex lens (305).

2. The high-energy pure fourth-order Mamyshev oscillator optical soliton generation system according to claim 1, characterized in that, The seed source (1) is structured as follows: the first pump (101) is connected to the 980nm end of the first wavelength division multiplexer (102); the 1550nm end of the first wavelength division multiplexer (102) is connected to one end of the first erbium-doped fiber (103); the other end of the first erbium-doped fiber (103) is connected to the input end of the first coupler (104); the 90% output end of the first coupler (104) is connected to the input end of the first fiber isolator (105); the output end of the first fiber isolator (105) is connected to one end of the three-ring polarization controller (106); the other end of the three-ring polarization controller (106) is connected to one end of the first polarizer (107); the other end of the first polarizer (107) is connected to the common end of the first wavelength division multiplexer (102); and the optical pulse is output from the 10% output end of the first coupler (104).

3. The high-energy pure fourth-order Mamyshev oscillator optical soliton generation system according to claim 1, characterized in that, The pulse expansion module (4) is structured such that the light pulse is transmitted through the third convex lens (401) to the first plano-convex lens (402), the first plano-convex lens (402) transmits the light pulse to the first polarization beam splitter (403), the light pulse is transmitted through the port of the first polarization beam splitter (403) perpendicular to the incident direction to the first alignment plate (404), the light pulse is transmitted through the first alignment plate (404) to the first reflector (406), and the first reflector (406) transmits the light pulse to... On the third grating (410), the third grating (410) transmits the light pulse to the first convex mirror (408), the first convex mirror (408) transmits the light pulse to the second concave mirror (409), and the light pulse is reflected back to the first convex mirror (408) by the second concave mirror (409). The first convex mirror (408) transmits the light pulse to the third grating (410), and the light pulse is reflected back to the third grating (410) by the first roof prism (407). The light pulse passes through the third grating (410). After being reflected by the first convex mirror (408) and the second concave mirror (409), the light pulse returns to the third grating (410). The third grating (410) directs the pulse onto the second reflecting mirror (405), which then transmits the pulse to the second alignment plate (411). The pulse then travels through the second alignment plate (411) to the second polarizing beam splitter (412), and finally through the port of the second polarizing beam splitter (412) perpendicular to the incident direction to the first concave cylindrical lens (413). The first concave cylindrical lens (413) transmits the light pulse to the fourth convex lens (414), the fourth convex lens (414) transmits the light pulse to the first half-wave plate (415), the first half-wave plate (415) transmits the light pulse to the input end of the first spatial optical isolator (416), the light pulse is transmitted from the output end of the first spatial optical isolator (416) to the third reflector (417), and is reflected by the third reflector (417) to the output of the fourth reflector (418).

4. The high-energy pure fourth-order Mamyshev oscillator optical soliton generation system according to claim 1, characterized in that, The amplifier (5) is structured such that the light pulse is transmitted through the fifth reflector (501) to the second half-wave plate (502), the second half-wave plate (502) transmits the light pulse to the third polarization beam splitter (503), the light pulse is transmitted through the port of the third polarization beam splitter (503) parallel to the incident direction to the first modulator (504), the first modulator (504) transmits the light pulse to the third half-wave plate (505), the third half-wave plate (505) transmits the light pulse to the fourth polarization beam splitter (506), the fourth polarization beam splitter (506) transmits the pulse to the sixth reflector (507), the sixth reflector (507) transmits the light pulse to the second plano-convex lens (508), and the second... A plano-convex lens (508) transmits the light pulse to a third plano-convex lens (509), which in turn transmits the light pulse to a seventh reflecting mirror (510). The seventh reflecting mirror (510) then transmits the light pulse to a fifth polarization beam splitter (511). The light pulse is then transmitted through the port of the fifth polarization beam splitter (511) parallel to the incident light to a first Faraday rotator (512). The first Faraday rotator (512) transmits the light pulse to a fourth half-wave plate (513), which in turn transmits the light pulse to an eighth reflecting mirror (514). The eighth reflecting mirror (514) then transmits the light pulse to a first collimator (515), which in turn transmits the light pulse to a fourth erbium-doped fiber. On the fourth erbium-doped fiber (516), the light pulse is transmitted to the second collimator (517). The light pulse is transmitted to the fifth convex lens (518) through the second collimator (517), and reflected by the first dichroic mirror (519) in a direction perpendicular to the incident light to the fourth plano-convex lens (523). The light output from the fourth pump (522) is transmitted to the sixth convex lens (520) through the third collimator (521), enters the optical path through the first dichroic mirror (519), and is transmitted to the fourth erbium-doped fiber (516) through the fifth convex lens (518) and the second collimator (517). It is then transmitted to the fourth plano-convex lens (523) through the second collimator (517), the fifth convex lens (518), and the first dichroic mirror (519). The plano-convex lens (523) transmits the light pulse to the fifth plano-convex lens (524), which in turn transmits the light pulse to the third alignment plate (525). The light pulse is then transmitted via the third alignment plate (525) to the sixth plano-convex lens (526), ​​which in turn transmits the light pulse to the ninth reflecting mirror (527). The light pulse is then transmitted via the ninth reflecting mirror (527) to the tenth reflecting mirror (528), which in turn transmits the light pulse to the second Faraday rotator (529). The second Faraday rotator (529) transmits the light pulse to the fifth half-wave plate (530), which in turn transmits the light pulse to the seventh plano-convex lens (531).The seventh plano-convex lens (531) transmits the light pulse to the eighth plano-convex lens (532), which in turn transmits the light pulse to the second dichroic mirror (533). The light pulse is then transmitted via the second dichroic mirror (533) to the first photodiode (534), and via the first photodiode (534) to the eleventh reflecting mirror (535). The eleventh reflecting mirror (535) transmits the light pulse to the twelfth reflecting mirror (536), which in turn transmits it to the ninth plano-convex lens (537). The ninth plano-convex lens (537) transmits the light pulse to the tenth plano-convex lens (538), which... The light pulse is transmitted to the second photodiode (539), then to the third Faraday rotator (540), which transmits it to the thirteenth mirror (541). The light pulse then travels through the thirteenth mirror (541), the third Faraday rotator (540), the second photodiode (539), the tenth plano-convex lens (538), the ninth plano-convex lens (537), the twelfth mirror (536), the eleventh mirror (535), and the first photodiode (534) back to the second dichroic mirror (533), from which it is output.

5. The high-energy pure fourth-order Mamyshev oscillator optical soliton generation system according to claim 1, characterized in that, The compressor (6) is structured such that the light pulse is transmitted through the fourteenth reflector (601) to the first prism (602), the first prism (602) transmits the light pulse to the second prism (603), the second prism (603) transmits the light pulse to the fifteenth reflector (604), the light pulse is reflected by the fifteenth reflector (604), and after passing through the second prism (603), the first prism (602) transmits the light pulse to the third dichroic mirror (605), and the third dichroic mirror (605) further transmits the light pulse. The light pulse is transmitted to the sixteenth mirror (606), which transmits it to the first polarizer (607). The first polarizer (607) transmits the light pulse to the sixth half-wave plate (608), which transmits it to the input of the second spatial optical isolator (609). The light pulse is then transmitted through the output of the second spatial optical isolator (609) to the seventh half-wave plate (610). (610) The light pulse is transmitted to the first quarter-wave plate (611), which transmits it to the second polarizer (612). The second polarizer (612) transmits the light pulse to the seventeenth mirror (613), which transmits it to the fourth dichroic mirror (614). The fourth dichroic mirror (614) transmits the light pulse to the eighteenth mirror (615), which transmits it to the eighth... On the half-wave plate (616), the light pulse is transmitted to the fourth grating (618) via the fifth dichroic mirror (617). The fourth grating (618) transmits the light pulse to the fifth grating (619). The fifth grating (619) transmits the light pulse to the nineteenth mirror (620). The light pulse is reflected by the nineteenth mirror (620), and then transmitted to the fifth dichroic mirror (617) via the fifth grating (619) and the fourth grating (618). The light pulse is then output from the fifth dichroic mirror (617).

Images