CN109494563B - Doe coherent synthetic laser source based on ring cavity initiative light feedback - Google Patents

Doe coherent synthetic laser source based on ring cavity initiative light feedback Download PDF

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CN109494563B
CN109494563B CN201811530084.4A CN201811530084A CN109494563B CN 109494563 B CN109494563 B CN 109494563B CN 201811530084 A CN201811530084 A CN 201811530084A CN 109494563 B CN109494563 B CN 109494563B
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feedback
optical
optical fiber
laser
light
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CN109494563A (en
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周军
柏刚
沈辉
杨依枫
何兵
牛夏夏
刘美忠
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Shanghai Institute of Optics and Fine Mechanics of CAS
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Shanghai Institute of Optics and Fine Mechanics of CAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/1305—Feedback control systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
    • G02B27/4266—Diffraction theory; Mathematical models
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/083—Ring lasers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Lasers (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

A laser light source for coherent synthesis of a diffraction optical element based on annular cavity active optical feedback mainly comprises a passive annular cavity with all-optical feedback and a two-stage active control optical loop with different tuning ranges. The method is characterized in that a plurality of paths of optical fiber lasers with narrow line widths are combined into a beam of high-energy laser space to be output in an all-optical feedback common-aperture coherent synthesis mode, an actively controlled feedback loop is added to ensure that the wavelength of an initial main oscillation seed is consistent with the central wavelength of a feedback cavity mode, the output line width of the synthesized laser is further narrowed, phase noise is reduced, the interference of the external environment on an annular cavity is reduced, and the stability of a phase locking effect is maintained. The invention overcomes the characteristics of low synthesis efficiency, strong phase noise and poor phase locking effect of the traditional passive coherent synthesis system, can keep the stability and the safety of the synthesis system, is beneficial to expanding the scale of an array and improving the brightness of narrow-linewidth output laser, and is an effective technical way for realizing the better light beam quality expansion of an optical fiber laser to higher power.

Description

Doe coherent synthetic laser source based on ring cavity initiative light feedback
Technical Field
The invention relates to a laser light source, in particular to a laser light source based on coherent synthesis of a Diffraction Optical Element (DOE) of ring cavity active light feedback.
Background
The fiber laser has the advantages of simple and compact structure, convenient thermal management, high energy conversion efficiency, stable and reliable performance and good beam quality, and is widely applied to the technical field of high-power laser. The output power of the single-mode fiber laser breaks through the ten-kilowatt level at present. However, the output power of a single fiber laser has theoretical limit due to the limitation of factors such as thermal effect, nonlinear effect, mode instability and end face damage.
In order to increase the output power of a fiber laser light source with narrow line width and low phase noise, coherent light beam combining has been proposed and studied intensively, and is one of the most important technical means at present. The technology combines a plurality of paths of optical fiber lasers with low phase noise based on an MOPA structure, and controls the phase of each sub-path group beam laser to achieve phase locking to obtain coherent superposition, so that the output laser has optical characteristics similar to those of a single path laser, and the output power of the laser after coherent combination can be effectively improved. The all-optical feedback passive coherent synthesis technology is one of the synthesis methods, and the method does not need complex phase locking conditions, has high response speed, simple structure and strong path expandability, and is a hot spot of recent research. The technology adopts an all-optical feedback annular cavity structure, mode filtering is carried out through a single-mode fiber filter, the loss in the in-phase optical signal cavity is minimized, phase locking of each path of fiber laser is obtained through the self-organized phase selection mode, and the brightness of the combined laser is greatly improved.
In the prior art, the fiber laser all-optical feedback passive coherent beam combination system CN103441419A based on the Dammann grating needs to assist the main oscillation to provide seeds for the amplifier, provide initial feedback light and ensure that the amplifier is not damaged by self-excited oscillation after a feedback loop is accidentally shielded. After the sub-beam array achieves phase locking, the wavelength is locked in a mode with the smallest loss of the ring cavity, the cavity mode with the phase locking is different from the seed wavelength, and at the moment, the auxiliary main oscillation needs to be manually closed to ensure that only the wavelength with the phase locking exists in the ring cavity, so that the brightness and the stability of far-field output laser are improved. However, the turning off of the auxiliary main oscillation may cause a safety hazard to the optical fiber amplifier array, that is, the amplifier loses its seed when the feedback loop is accidentally shielded, resulting in serious self-oscillation and damage to the amplifier. Therefore, the brightness of the output laser of the all-optical feedback ring cavity passive coherent combining system is improved, and the system safety of the protection amplifier is an irreconcilable contradiction. In addition, the frequency band of the laser output by the existing all-optical feedback annular cavity is wide, the phase noise is high, the phase locking effect is difficult to keep stable, and the prospect of subsequent expansion and application of the high-power common-aperture coherent synthetic light source is seriously hindered.
Disclosure of Invention
Aiming at the defects in the all-optical feedback annular cavity passive coherent synthesis device, the invention provides a laser light source for coherent synthesis of a diffraction optical element based on annular cavity active light feedback. The laser light source adds an active photoelectric feedback control means in a passive annular cavity with all-optical feedback, coordinates and optimizes various performance parameters of a double-loop circuit through the combined action of active control and a passive optical feedback system so as to obtain a stable phase-locking effect, narrow the output line width of synthesized laser, reduce phase noise and improve the brightness and stability of far-field synthesized light.
The technical solution of the invention is as follows:
a laser light source of coherent synthesis of diffraction optical element based on ring cavity active optical feedback is characterized by comprising a passive ring cavity with all-optical feedback and an active photoelectric feedback loop,
the passive annular cavity with all-optical feedback comprises 1 XN optical fiber beam splitters which are connected in sequence, the 1 XN optical fiber beam splitter divides incident light into N paths, the N paths of incident light are converged to an DOE element through N paths of optical fiber amplifiers, corresponding output end cap arrays and a first collimating Fourier lens, the DOE element is divided into first transmission light and first reflection light through a first plane beam splitter, a power detector is arranged in the direction of the first reflection light, a second imaging Fourier lens and a second plane beam splitter are arranged in the direction of the first transmission light in sequence, the second plane beam splitter divides the input light into second transmission light and second reflection light, a CCD camera is arranged in the direction of the second transmission light, the second reflection light is connected with the input end of the 1 XN optical fiber beam splitter through a single-mode feedback optical fiber, a feedback optical fiber preamplifier, an optical fiber coupler and a seed optical fiber preamplifier in sequence, and the horizontal heights of the output end cap arrays need to be kept consistent, the optical axes are parallel to each other, the pointing deviation angle of a far field is controlled to be in the micro radian magnitude, and the interval D between the far field and the central optical axis in the vertical direction meets the following conditions:
D＝f·tanθ
in the formula, f is the focal length of the first collimating Fourier lens, theta is the included angle between the corresponding diffraction order of the end cap and the central 0-order diffraction light, the effective clear aperture of the first collimating Fourier lens is far larger than the outline of the divergent spot surface of the output end cap array, and the output end cap array and the DOE element are respectively arranged at the front and rear focal points of the Fourier lens to jointly form a 2f imaging system;
the active photoelectric feedback loop comprises a seed source with tunable wavelength, the output end of the seed source with tunable wavelength is connected with the input end of the optical fiber coupler, the second output end of the optical fiber coupler is connected with a photoelectric probe PD, the output end of the photoelectric probe PD is connected with a PID control system, and the PID control system is respectively connected with the control end of the seed source with tunable wavelength through the temperature tuning with wide range and low bandwidth and the current tuning with narrow range and high bandwidth of corresponding bandwidth.
The DOE element is a one-dimensional diffractive element, or a two-dimensional diffractive element.
The seed source with tunable wavelength has a tuning range reaching the nanometer level.
The N-path optical fiber amplifier can be single-stage amplification or multi-stage cascade amplification.
The single-mode feedback optical fiber is a single-mode passive optical fiber, and needs to be placed at the focus of the second imaging Fourier lens to ensure the coupling efficiency of feedback light.
And the wavelength of the primary oscillation seed under initial protection is consistent with the central wavelength of a resonant cavity mode in the all-optical feedback annular cavity through the wide-range and low-bandwidth temperature tuning and the narrow-range and high-bandwidth current tuning of the corresponding bandwidth to feed back the laser wavelength of the tuned seed source on line in real time.
The positional relationship of the above components is as follows: the 1 XN optical fiber beam splitter divides the incident seed laser in equal proportion and injects the divided seed laser into the N paths of optical fiber amplifier arrays. The output end cap array and the DOE element are respectively arranged at the front focus and the rear focus of the first collimating Fourier lens to jointly form a 2f imaging system, and the Fourier lens simultaneously realizes the functions of self-collimating and light path adjusting on all incident laser sub-beams, so that all paths of laser are focused to the same position on the surface of the DOE element at corresponding diffraction angles. The transmission parallel light synthesized by the DOE element is split by the first plane beam splitter, the main energy in the reflection direction is used for power detection, and the parallel light in the transmission direction is respectively coupled with a single-mode optical fiber and monitored on line for the beam quality by the second imaging Fourier lens and the second plane beam splitter. The signal light coupled into the single-mode feedback fiber is subjected to power boosting by using the fiber preamplifier, and is injected into the fiber preamplifier sequentially connected with the initial seed light through the fiber coupler together with the initial seed light to serve as common initial signal light.
The active photoelectric feedback loop firstly coarsely tunes the central wavelength of the wavelength tunable seed source to the mode with the minimum loss of the feedback ring cavity, then leads out a beat frequency signal of a ring cavity oscillation mode and seed laser from a vacant end of the optical fiber coupler, enters a PID control system after being received by the photoelectric probe PD, is amplified and filtered to be used as a feedback signal and used for driving a fast and slow tuning module of the seed source laser, and finally locks the wavelength of the seed source at the central wavelength of the feedback ring cavity mode in real time.
The seed source with tunable wavelength has a tuning range reaching the nanometer level, and can simultaneously perform temperature tuning in a wide range and a low bandwidth and current tuning in a narrow range and a high bandwidth.
The invention has the beneficial effects that:
the invention combines the passive all-optical feedback phase locking mode with the active frequency control mode, pre-suppresses the phase noise of the synthesized laser by utilizing the larger dynamic range and the quick response of the optical feedback of the ring cavity, and then further suppresses the laser phase noise by adopting the high-precision control of the active phase, thereby obtaining the more stable laser phase locking effect.
Through the novel coherent synthesis mode of the active optical feedback of the annular cavity, the stable operation of the annular cavity can be reasonably ensured under the condition that the main oscillation seed source is not manually closed, the output performance of coherent synthesis laser cannot be influenced, and the contradiction between the brightness improvement of the output laser of the all-optical feedback annular cavity passive coherent synthesis system and the system safety of the protection amplifier is effectively solved.
The coherent synthesis based on the DOE element can effectively solve the problems of multi-level side lobes and low synthesis efficiency in the split-aperture coherent synthesis, and finally single beam output close to the diffraction limit is obtained in a far field. The diffraction efficiency of the DOE element is up to more than 95%, the more DOE elements with the sub-beams can be synthesized, the higher the diffraction efficiency is, and the synthesis efficiency and the total output power can be further improved.
Drawings
FIG. 1 is a schematic diagram of DOE coherent synthesis technical solution based on ring cavity active optical feedback in the present invention
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, but the scope of the present invention should not be limited thereto.
Fig. 1 is a schematic diagram of a DOE coherent synthesis light source based on ring cavity active light feedback according to the present invention. As can be seen from the figure, the laser source coherently synthesized by the diffractive optical element based on the ring cavity active optical feedback of the invention comprises a passive ring cavity 1 and an active photoelectric feedback loop 2 which are all-optically fed back,
the passive ring cavity 1 with all-optical feedback comprises a 1 × N optical fiber beam splitter 101 connected in sequence, the 1 × N optical fiber beam splitter 101 splits incident light into N paths, the N paths of incident light are converged to an DOE element 105 by an N path optical fiber amplifier 102, a corresponding output end cap array 103 and a first collimating fourier lens 104, and then split into first transmitted light and first reflected light by a first plane beam splitter 106, the first reflected light is directed to a power detector 107, the first transmitted light is directed to a second imaging fourier lens 108 and a second plane beam splitter 109 in sequence, the second plane beam splitter 109 splits the incident light into second transmitted light and second reflected light, the second transmitted light is directed to a CCD camera 110, and the second reflected light is directed to an input end of the 1 × N optical fiber beam splitter 101 in sequence by a single mode feedback optical fiber 111, a feedback optical fiber preamplifier 112, an optical fiber coupler 113 and a seed optical fiber preamplifier 114, the horizontal heights of the output end cap arrays 103 need to be kept consistent, the optical axes are parallel to each other, the pointing deviation angle of a far field needs to be controlled at a micro radian magnitude, and the interval D between the vertical direction and the central optical axis meets the following conditions:
D＝f·tanθ
in the formula, f is the focal length of the first collimating fourier lens 104, θ is the included angle between the corresponding diffraction order of the end cap and the central 0 th order diffraction light, the effective clear aperture of the first collimating fourier lens 104 must be much larger than the outline of the divergent spot surface of the output end cap array 103, and the output end cap array 103 and the DOE element 105 are respectively arranged at the front and rear focal points of the fourier lens to jointly form a 2f imaging system;
the active photoelectric feedback loop 2 comprises a wavelength tunable seed source 201, an output end of the wavelength tunable seed source 201 is connected with an input end of the optical fiber coupler 113, a second output end of the optical fiber coupler 113 is connected with a photoelectric probe PD205, an output end of the photoelectric probe PD205 is connected with a PID control system 204, and the PID control system 204 is respectively connected with a control end of the wavelength tunable seed source 201 through a wide-range low-bandwidth temperature tuning 202 and a narrow-range high-bandwidth current tuning 203 with corresponding bandwidths.
The positional relationship of the above components is as follows: the 1 × N optical fiber beam splitter 101 splits the incident seed laser in equal proportion and injects the split seed laser into the N optical fiber amplifier arrays 102. The output end cap array 103 and the DOE element 105 are respectively disposed at front and rear focal points of the first collimating fourier lens 104 to jointly form a 2f imaging system, and the fourier lens 104 simultaneously achieves functions of self-collimating and light path adjusting for all incident laser sub-beams, so that each path of laser is focused on the same position on the surface of the DOE element 105 at a corresponding diffraction angle. The transmitted parallel light synthesized by the DOE element 105 is split by the first plane beam splitter 106, the main energy in the reflection direction is used for the power detector 107, and the parallel light in the transmission direction is respectively coupled by the single-mode optical fiber and monitored on line by the beam quality through the second imaging fourier lens 108 and the second plane beam splitter 109. The signal light coupled into the single-mode feedback fiber 111 is boosted in power by the fiber preamplifier 112, and is injected together with the initial seed light into the fiber preamplifier 114 connected in series immediately after through the fiber coupler 113 as the common initial signal light.
The active photoelectric feedback loop 2 firstly coarsely tunes the central wavelength of the seed source 201 with tunable wavelength to the mode where the loss of the feedback ring cavity is minimum, then derives the beat frequency signal of the ring cavity oscillation mode and the seed laser from the vacant end of the optical fiber coupler 113, enters the PID control system 204 after being received by the photoelectric probe PD205, and is used as a feedback signal after being amplified and filtered to drive different tuning modules of the seed source laser, wherein the feedback signal mainly comprises a wide-range low-bandwidth temperature tuning 202 and a narrow-range high-bandwidth current tuning 203, and finally the wavelength of the seed source is locked at the central wavelength of the feedback ring cavity mode in real time.
The laser output power monitored at the reflection port 107 of the first plane beam splitter 106 is combined with the light beam quality measured by the CCD camera 110, the brightness of the synthesized laser is derived and calculated, and the brightness change of the output laser before and after active control is contrasted and analyzed.
The horizontal heights of the output end cap arrays 103 need to be kept consistent, the optical axes are parallel to each other, the pointing deviation angle of a far field needs to be controlled at a micro radian magnitude, and the interval D between the vertical direction and the central optical axis meets the following conditions:
D＝f·tanθ
where f is the focal length of the first collimating Fourier lens 104, and θ is the angle between the corresponding diffraction order of the end cap and the central 0 th order diffracted light.
The feedback optical fiber 111 is a double-clad single-mode passive optical fiber with a fiber core of 9 μm and an inner cladding diameter of 125 μm, and needs to be placed at the focus of the second imaging fourier lens to ensure the coupling efficiency of the feedback light.
The wavelength tunable seed source 201 can be used for temperature slow tuning 202 and current fast tuning 203, respectively, and is conveniently connected directly to the input end of the fiber coupler 113.
The front surfaces of the first plane beam splitter 106 and the second plane beam splitter 109 are plated with a high-reflectivity film layer with 99% of laser reflectivity, and the rear surfaces are plated with an anti-reflection film layer and are placed at an included angle of 45 degrees with an optical axis.
Experiments show that the invention combines the optical fiber lasers with multiple paths of narrow line widths into a beam of high-energy laser space for output in a full-optical feedback common-aperture coherent synthesis mode, and an actively controlled feedback loop is added to ensure that the wavelength of the initial main oscillation seed is consistent with the central wavelength of a feedback cavity mode, so that the output line width of the synthesized laser is further narrowed, the phase noise is reduced, the interference of the external environment on an annular cavity is reduced, and the stability of the phase locking effect is maintained. The invention overcomes the characteristics of low synthesis efficiency, strong phase noise and poor phase locking effect of the traditional passive coherent synthesis system, can keep the stability and the safety of the synthesis system, is beneficial to expanding the scale of an array and improving the brightness of narrow-linewidth output laser, and is an effective technical way for realizing the better light beam quality expansion of an optical fiber laser to higher power.

Claims (6)

1. A laser light source coherently synthesized by a diffractive optical element based on ring cavity active optical feedback is characterized by comprising a passive ring cavity (1) with all-optical feedback and an active photoelectric feedback loop (2),
the passive annular cavity (1) with all-optical feedback comprises a 1 xN optical fiber beam splitter (101) which are sequentially connected, wherein incident light is divided into N paths by the 1 xN optical fiber beam splitter (101), the N paths of incident light are converged to an DOE element (105) through an N-path optical fiber amplifier (102), a corresponding output end cap array (103) and a first collimating Fourier lens (104), the incident light is divided into first transmission light and first reflection light through a first plane beam splitter (106), a power detector (107) is arranged in the first reflection light direction, a second imaging Fourier lens (108) and a second plane beam splitter (109) are sequentially arranged in the first transmission light direction, the input light is divided into second transmission light and second reflection light by the second plane beam splitter (109), a CCD camera (110) is arranged in the second transmission light direction, and the second reflection light direction sequentially passes through a single-mode feedback optical fiber (111), a feedback optical fiber preamplifier (112), The optical fiber coupler (113) and the seed optical fiber preamplifier (114) are injected into the input end of the 1 xN optical fiber beam splitter (101), the horizontal heights of the output end cap arrays (103) need to be kept consistent, the optical axes are parallel to each other, the pointing deviation angle of a far field needs to be controlled to be in the micro radian order, and the interval D between the vertical direction and the central optical axis meets the following conditions:
D＝f·tanθ
in the formula, f is the focal length of the first collimating Fourier lens (104), theta is the included angle between the corresponding diffraction order of the end cap and the central 0-order diffraction light, the effective clear aperture of the first collimating Fourier lens (104) is necessarily far larger than the outline of the divergent spot surface of the output end cap array (103), and the output end cap array (103) and the DOE element (105) are respectively arranged at the front and rear focal points of the Fourier lens to jointly form a 2f imaging system;
the active photoelectric feedback loop (2) comprises a seed source (201) with tunable wavelength, the output end of the seed source (201) with tunable wavelength is connected with the input end of the optical fiber coupler (113), the second output end of the optical fiber coupler (113) is connected with a photoelectric probe PD (205), the output end of the photoelectric probe PD (205) is connected with a PID control system (204), and the PID control system (204) is respectively connected with the control end of the seed source (201) with tunable wavelength through a wide-band, low-band temperature tuning (202) and a narrow-band, high-band current tuning (203) with corresponding band width.
2. The laser light source according to claim 1, characterized in that the DOE element (105) is a one-dimensional diffractive element, or a two-dimensional diffractive element.
3. The laser source of claim 1, wherein the wavelength tunable seed source (201) has a tuning range of up to nanometer order.
4. The laser light source of claim 1, wherein the single-mode feedback fiber (111) is a single-mode passive fiber, one end of which is placed at the focal point of the second imaging fourier lens (108).
5. The laser light source of claim 1, wherein the N-way fiber amplifier is a single-stage amplifier or a multi-stage cascade amplifier.
6. The laser light source according to any of claims 1 to 5, characterized in that the initial protected main oscillation seed wavelength is aligned with the center wavelength of the resonant cavity mode in the all-optical feedback ring cavity by real-time online feedback of the laser wavelength of the wavelength tunable seed source (201) through wide-range, low-bandwidth temperature tuning (202) and narrow-range, high-bandwidth current tuning (203) of the respective bandwidths.
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CN111694162B (en) * 2020-06-22 2022-09-13 中国科学院西安光学精密机械研究所 Spectrum synthesis method and device
CN113823996B (en) * 2021-07-28 2023-01-03 中国工程物理研究院应用电子学研究所 Method and system for realizing high-power near-diffraction limit semiconductor laser

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CN103441419A (en) * 2013-08-30 2013-12-11 中国科学院上海光学精密机械研究所 Optical fiber laser all-optical feedback passive coherence beam combination system based on Dammann grating
CN104793339B (en) * 2015-05-13 2017-02-22 中国人民解放军国防科学技术大学 Fiber laser coherent combining system based on adaptive precision light path adjustment

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