CN108039638B - Low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locked laser - Google Patents
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 51
- 238000001228 spectrum Methods 0.000 title claims abstract description 30
- 238000007493 shaping process Methods 0.000 title claims abstract description 14
- 239000000835 fiber Substances 0.000 claims abstract description 56
- 238000005253 cladding Methods 0.000 claims abstract description 29
- 239000013305 flexible fiber Substances 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims description 26
- 230000010355 oscillation Effects 0.000 claims description 19
- 230000001012 protector Effects 0.000 claims description 15
- 230000010287 polarization Effects 0.000 claims description 12
- 239000004065 semiconductor Substances 0.000 claims description 12
- 239000010453 quartz Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 230000003595 spectral effect Effects 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000010354 integration Effects 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000007526 fusion splicing Methods 0.000 abstract description 3
- 239000004038 photonic crystal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012984 biological imaging Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094069—Multi-mode pumping
-
- 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
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06704—Housings; Packages
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
-
- 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
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
-
- 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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
Abstract
The invention belongs to the technical field of laser technology and nonlinear optics, and particularly relates to a low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locked laser. The invention adopts an all-fiber scheme of fusion splicing the multimode pump laser source, the high-power pump signal beam combiner and the flexible double-cladding gain fiber, and adopts a double-stage spectral filtering pulse shaping measure to realize the low-threshold flexible fiber high-power femtosecond mode-locking laser source with compact structure. The invention not only satisfies the low threshold mode locking to realize the high average power mode locking laser output function, but also obviously improves the structural compactness and stability of the laser, has the characteristics of high integration, high stability, low mode locking threshold and high power output, and has important application prospect.
Description
Technical Field
The invention belongs to the technical field of laser technology and nonlinear optics, and particularly relates to a low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locked laser.
Background
Fiber lasers are rapidly growing in laser technology development with high efficiency, easy integration, excellent beam quality, and other characteristics, and are a hot research topic in academia and industry. As an important laser technology, the ultrafast fiber laser provides a brand new research means for the fields of intense field physics, attosecond science, nano science, biological imaging and the like, and greatly promotes the development of the subjects. The ultra-short pulse mode-locked fiber laser oscillator is used as a core module of a fiber laser amplifier, particularly a femtosecond fiber laser amplifier, the output performance of the ultra-short pulse mode-locked fiber laser oscillator has a decisive effect on the stable and reliable operation of the whole laser system, and the ultra-short pulse mode-locked fiber laser oscillator is a precondition and guarantee for realizing a high-performance femtosecond fiber laser source.
The ultra-short pulse mode-locked fiber laser oscillators widely reported at present are usually based on single-mode fibers with the fiber core diameter of 6 mu m, and the laser components of the ultra-short pulse mode-locked fiber laser oscillators generally comprise single-mode pump sources, wavelength division multiplexers, single-mode gain fibers, isolators, mode-locked devices, dispersion compensation elements and the like. However, due to the low output power (< 1W) of the single-mode pump source, the device core diameter adopted by the laser is relatively small, so that the mode-locked laser output power is generally smaller than 100mW, which limits the application range.
With the progress of advanced optical fiber manufacturing technology and the appearance of large-mode-field photonic crystal fibers, the output power of a mode-locked fiber laser oscillator is remarkably improved, and the output power is expanded to a level of tens of watts from the initial tens of milliwatts. For example, in 2012, martin Baumgartl et al, yes, germany, in paper "66W average power from a microjoule-class sub-100fs fiber oscillator" (Opt. Lett.37 (10), 1640-1642 (2012)), reported a high power mode-locked fiber laser output with an average power of 66W. However, a large-mode-field photonic crystal fiber mode-locked laser generally needs a complex spatial light path, wherein the most typical method is that firstly, an aspheric lens is used for carrying out free space collimation on pump laser, and then the pump laser is focused and coupled into a photonic crystal gain fiber through the aspheric lens, so that the system structure is relatively complex due to the introduction of the free space light path of the pump laser, the mode-locking threshold is high, the integration is not easy, the mode-locking instability is increased, and the wider application space of the pump laser is limited.
Disclosure of Invention
The invention aims to provide a low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locking laser, which solves the problems of low output power, complex structure, high mode-locking threshold, poor stability and the like of the traditional mode-locking laser based on a single-mode optical fiber or photonic crystal optical fiber as a gain medium.
The technical scheme of the invention is as follows: a low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locked laser is characterized in that: the device comprises a semiconductor pump laser, a multimode pump protector, a pump signal beam combiner, a flexible double-cladding gain fiber, a first end cap and a second end cap;
the output optical fiber of the semiconductor pump laser is welded with the input optical fiber of the multimode pump protector, and the output optical fiber of the multimode pump protector is welded with the pump optical fiber of the pump signal beam combiner; the forward port optical fiber of the pump signal beam combiner is welded with the first end cap, the backward port optical fiber of the pump signal beam combiner is welded with one end of the flexible double-cladding gain optical fiber, and the other end of the flexible double-cladding gain optical fiber is welded with the second end cap;
the pumping light emitted by the semiconductor pumping laser sequentially passes through the multimode pumping protector and the pumping signal beam combiner and then is coupled into the flexible double-cladding gain fiber, and then the second end emits and outputs oscillation light; the direction of the oscillating light output by the second end cap is the same as the direction of the pumping light path;
the oscillating light output by the second end cap is collimated by the collimating lens, sequentially reflected and turned by the dichroic mirror and the first plane high reflection mirror, sequentially transmitted by the first quarter wave plate and the half wave plate and then reaches the polarization beam splitter; the included angles between the incident light and the reflected light of the dichroic mirror and the first plane high-reflection mirror are 90 degrees;
the polarization beam splitter is used as a laser output port to reflect and output part of oscillation light, and the rest oscillation light is transmitted through the polarization beam splitter, then sequentially transmitted through the two-stage spectrum filter, the isolator and the second quarter wave plate, and then reflected and turned through the second plane high-reflection mirror and the third plane high-reflection mirror to reach the focusing lens; the included angle between the incident light and the reflected light of the second plane high reflection mirror and the third plane high reflection mirror is 90 degrees;
the focusing lens focuses and couples the oscillation light and then enters the pumping signal beam combiner through the first end to form annular mode-locked laser oscillation.
Further, the flexible double-cladding gain fiber is ytterbium-doped large-core gain fiber, the diameter of the fiber core is 25-30 mu m, the diameter of the cladding is 250 mu m, the length of the fiber is 1-2m, and the coiling diameter of the fiber is 5-8cm.
Further, the first end cap and the second end cap are multimode quartz rods with the diameter of 250 mu m; the length of the first end cap is 2-4mm, and the end face angle is 0 degree; the length of the second end cap is 3-7mm, and the end face angle is 5-8 degrees.
Further, the two-stage spectrum filter comprises a second spectrum filter and a first spectrum filter which are sequentially arranged along the propagation direction of the oscillating light, wherein the thickness of the first spectrum filter is 5-7mm, and the thickness of the second spectrum filter is 7-8mm; the first spectrum filter and the second spectrum filter are symmetrically arranged at Brewster angles respectively.
Further, the output fiber of the semiconductor pump laser has a fiber core diameter of 105 μm, a cladding diameter of 125 μm, a numerical aperture of 0.22 and an output wavelength of 970-980nm;
the diameters of the fiber cores of the input end optical fiber and the output end optical fiber of the multimode pump protector are 105 mu m, the diameter of the cladding is 125 mu m, and the numerical aperture is 0.22;
the pump signal beam combiner is an (n+1) x 1 type multimode pump signal beam combiner, wherein N is an integer greater than or equal to 2; the fiber core diameter of the pumping end optical fiber of the pumping signal beam combiner is 105 mu m, the cladding diameter is 125 mu m, and the numerical aperture is 0.22; the fiber core diameters of the forward port optical fiber and the backward port optical fiber of the pump signal beam combiner are 25-30 mu m, the cladding diameter is 250 mu m, and the numerical aperture is 0.07; the single-arm bearing power of the pumping end optical fiber of the pumping signal beam combiner is 50W.
Further, the mirror surface of the dichroic mirror is coated with a high reflection film in a wavelength range of 1000-1100nm and an antireflection film in a wavelength range of 970-980 nm.
Further, the focal length of the collimating lens is equal to that of the focusing lens, and the focal length is 50-75mm; the mirror surfaces of the collimating lens and the focusing lens are plated with an antireflection film in a wavelength range of 1000-1100 nm; the mirror surfaces of the first plane high-reflection mirror, the second plane high-reflection mirror and the third plane high-reflection mirror are all plated with total reflection films with the wavelength range of 1000-1100 nm; the first quarter wave plate, the half wave plate, the polarization beam splitter, the isolator and the second quarter wave plate are all plated with antireflection films in the wavelength range of 1000-1100 nm.
The invention has the beneficial effects that:
(1) The invention adopts an all-fiber scheme of fusion splicing the multimode pump laser source, the high-power pump signal beam combiner and the flexible double-cladding gain fiber, and adopts a double-stage spectral filtering pulse shaping measure to realize the low-threshold flexible fiber high-power femtosecond mode-locking laser source with compact structure.
(2) The invention not only satisfies the low threshold mode locking to realize the high average power mode locking laser output function, but also obviously improves the structural compactness and stability of the laser, has the characteristics of high integration, high stability, low mode locking threshold and high power output, and has important application prospect.
(3) The invention uses the rare earth ion doped flexible double-cladding gain fiber as gain and nonlinear medium, uses the self-phase modulation effect generated by strong peak power laser pulse in the oscillation cavity to generate wide spectrum, and simultaneously adopts the two-stage spectrum shaping technology to carry out effective spectrum filtering so as to realize the output of the low-mode-locking threshold and high-power femtosecond mode-locking fiber laser. The invention can output mode-locked laser with the central wavelength of 1041nm, the power of 9W, the repetition frequency of 73.4MHz, the compressed pulse width of 102fs and the power stability of 0.5% RMS in 3 hours.
Drawings
Fig. 1 is a schematic diagram of the optical path structure of the low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locked laser.
Fig. 2 is a sequence of the output mode-locked oscilloscope of the low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locked laser according to the invention.
FIG. 3 is a graph showing the output spectrum of the low-threshold two-stage spectrally shaped flexible fiber high-power mode-locked laser of the present invention.
Fig. 4 is a schematic diagram of a power stability test of the low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locked laser according to the present invention.
FIG. 5 is a schematic diagram of the pulse width of the low-threshold two-stage spectrally shaped flexible fiber high-power mode-locked laser of the present invention after compression.
Detailed Description
Referring to fig. 1, the present invention provides a low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locked laser, and the structure of the preferred embodiment of the present invention includes a semiconductor pump laser 1, a multimode pump protector 2, a pump signal combiner 3, a flexible double-cladding gain optical fiber 4, a first cap 130 and a second cap 131;
the output optical fiber of the semiconductor pump laser 1 is welded with the input optical fiber of the multimode pump protector 2, and the output optical fiber of the multimode pump protector 2 is welded with the pump optical fiber of the pump signal combiner 3; the forward port fiber of the pump signal combiner 3 is welded to the first cap 130, the backward port fiber of the pump signal combiner 3 is welded to one end of the flexible double-clad gain fiber 4, and the other end of the flexible double-clad gain fiber 4 is welded to the second cap 131.
Wherein, the semiconductor pump laser 1 can select a 30W,976nm narrow linewidth laser, the fiber core diameter of the output optical fiber is 105 μm, the cladding diameter is 125 μm, and the numerical aperture is 0.22; the core diameter of the input end optical fiber and the core diameter of the output end optical fiber of the multimode pump protector 2 are 105 μm, the cladding diameter is 125 μm, and the numerical aperture is 0.22. The pump signal beam combiner 3 can be a (2+1) x 1 type multimode pump signal beam combiner, the core diameter of the pump end optical fiber is 105 μm, the cladding diameter is 125 μm, and the numerical aperture is 0.22; the core diameter of the forward port optical fiber and the backward port optical fiber of the pump signal combiner 3 is 30 μm, the cladding diameter is 250 μm, and the numerical aperture is 0.07; the single arm bearing power of the pumping end optical fiber of the pumping signal combiner 3 is 50W.
The flexible double-cladding gain fiber 4 is ytterbium-doped large-core gain fiber, the core diameter and the cladding diameter of the fiber are 30 μm and 250 μm respectively, the length of the fiber is 1.3m, and the pumping absorption coefficient of 976nm is 14.2dB/m. The end face damage threshold of the flexible double-clad gain fiber can be increased by fusion splicing the first cap 130 and the second cap 131. The first end cap 130 is a multimode quartz rod having a diameter of 250 μm and a length of 2mm, and the second end cap 131 is a multimode quartz rod having a diameter of 250 μm and a length of 5 mm. The inclination angles of the first end cap 130 and the second end cap 131 are 0 degrees and 8 degrees respectively, so that the etalon effect is prevented from affecting the mode locking stability.
The pumping light emitted by the semiconductor pumping laser 1 sequentially passes through the multimode pumping protector 2 and the pumping signal beam combiner 3 and then is coupled into the flexible double-cladding gain fiber 4, and then the oscillation light is output from the second end cap 131; the direction of the oscillation light output by the second end cap 131 is the same as the direction of the optical path of the pump light.
The oscillating light output by the second end cap 131 is collimated by the collimating lens 51, reflected and turned by the dichroic mirror 6 and the first plane high reflection mirror 70 in sequence, and then transmitted by the first quarter wave plate 80 and the half wave plate 9 in sequence to reach the polarization beam splitter 10; the included angles between the incident light and the reflected light of the dichroic mirror 6 and the first plane high reflection mirror 70 are 90 °;
the polarization beam splitter 10 is used as a laser output port to reflect and output part of oscillation light (marked as I), and the rest oscillation light is transmitted through the polarization beam splitter, then sequentially transmitted through the two-stage spectrum filter 11, the isolator 12 and the second quarter wave plate 81, and then reflected and turned through the second plane high reflecting mirror 71 and the third plane high reflecting mirror 72 to reach the focusing lens 52; the angle between the incident light and the reflected light of the second plane high reflection mirror 71 and the third plane high reflection mirror 72 is 90 °;
the focusing lens 52 focuses and couples the oscillation light and then enters the pumping signal beam combiner 3 through the first end cap 130 to form annular mode-locked laser oscillation.
The focal length of the collimating lens 51 and the focusing lens 52 is equal, and the collimating lens and the focusing lens are all 50mm precision polishing lenses, and the mirror surfaces of the collimating lens and the focusing lens are all plated with antireflection films in the wavelength range of 1000-1100 nm. The dichroic mirror 6 is coated with an antireflection film for 976nm pump laser and a high reflection film for 1000-1100nm band laser, and the incident angle is 45 degrees. The first plane high reflection mirror 70, the second plane high reflection mirror 71 and the third plane high reflection mirror 72 are all 45 DEG high reflection mirrors with wave bands of 1000-1100 nm. The first quarter wave plate 80, the half wave plate 9 and the second quarter wave plate 81 can be high-damage threshold zero-order wave plates, and the surface coating film can meet the broadband high-transmittance of the oscillation light in the resonant cavity. The isolator 12 is a polarization dependent isolator, ensuring unidirectional operation of the ring cavity mode-locked laser; the two-stage spectral filter 11 comprises a second spectral filter 111 and a first spectral filter 110 which are sequentially arranged along the propagation direction of the oscillating light, wherein the thickness of the first spectral filter 110 is 5.5mm, the thickness of the second spectral filter 111 is 7.5mm, and the two spectral filters are formed by a-cut quartz double-refraction plates symmetrically placed at Brewster angles. The polarizing beam splitter 10 can be a gram laser prism, and the surface coating film can be high in transmission of the oscillation laser.
By adjusting the first quarter wave plate 80, the half wave plate 9, the second quarter wave plate 81 and the two-stage spectral filter 11, stable mode-locked output can be achieved, and referring to fig. 2 to 5, the mode-locked laser outputs laser with a central wavelength of 1041nm, a power of 9W, a repetition rate of 73.4MHz, a compression pulse width of 102fs, and a 3-hour power stability of less than 0.5% rms.
Claims (3)
1. A low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locked laser is characterized in that: the device comprises a semiconductor pump laser, a multimode pump protector, a pump signal beam combiner, a flexible double-cladding gain fiber, a first end cap and a second end cap;
the output optical fiber of the semiconductor pump laser is welded with the input optical fiber of the multimode pump protector, and the output optical fiber of the multimode pump protector is welded with the pump optical fiber of the pump signal beam combiner; the forward port optical fiber of the pump signal beam combiner is welded with the first end cap, the backward port optical fiber of the pump signal beam combiner is welded with one end of the flexible double-cladding gain optical fiber, and the other end of the flexible double-cladding gain optical fiber is welded with the second end cap;
the pumping light emitted by the semiconductor pumping laser sequentially passes through the multimode pumping protector and the pumping signal beam combiner and then is coupled into the flexible double-cladding gain fiber, and then the second end emits and outputs oscillation light; the direction of the oscillating light output by the second end cap is the same as the direction of the pumping light path;
the oscillating light output by the second end cap is collimated by the collimating lens, sequentially reflected and turned by the dichroic mirror and the first plane high reflection mirror, sequentially transmitted by the first quarter wave plate and the half wave plate and then reaches the polarization beam splitter; the included angles between the incident light and the reflected light of the dichroic mirror and the first plane high-reflection mirror are 90 degrees;
the polarization beam splitter is used as a laser output port to reflect and output part of oscillation light, and the rest oscillation light is transmitted through the polarization beam splitter, then sequentially transmitted through the two-stage spectrum filter, the isolator and the second quarter wave plate, and then reflected and turned through the second plane high-reflection mirror and the third plane high-reflection mirror to reach the focusing lens; the included angle between the incident light and the reflected light of the second plane high reflection mirror and the third plane high reflection mirror is 90 degrees;
the focusing lens focuses and couples the oscillation light and then enters the pumping signal beam combiner through the first end to form annular mode-locked laser oscillation;
the two-stage spectrum filter comprises a second spectrum filter and a first spectrum filter which are sequentially arranged along the propagation direction of the oscillating light; the first spectrum filter and the second spectrum filter are symmetrically arranged at Brewster angles respectively;
the fiber core diameter of the output fiber of the semiconductor pump laser is 105 mu m, the cladding diameter is 125 mu m, the numerical aperture is 0.22, and the output wavelength is 970-980nm;
the diameters of the fiber cores of the input end optical fiber and the output end optical fiber of the multimode pump protector are 105 mu m, the diameter of the cladding is 125 mu m, and the numerical aperture is 0.22;
the pump signal beam combiner is an (n+1) x 1 type multimode pump signal beam combiner, wherein N is an integer greater than or equal to 2; the fiber core diameter of the pumping end optical fiber of the pumping signal beam combiner is 105 mu m, the cladding diameter is 125 mu m, and the numerical aperture is 0.22;
the mirror surface of the dichroic mirror is plated with a high reflection film with the wavelength range of 1000-1100nm and an antireflection film with the wavelength range of 970-980nm;
the focal length of the collimating lens is equal to that of the focusing lens, and is 50-75mm; the mirror surfaces of the collimating lens and the focusing lens are plated with an antireflection film in a wavelength range of 1000-1100 nm; the mirror surfaces of the first plane high-reflection mirror, the second plane high-reflection mirror and the third plane high-reflection mirror are all plated with total reflection films with the wavelength range of 1000-1100 nm; the first quarter wave plate, the half wave plate, the polarization beam splitter, the isolator and the second quarter wave plate are all plated with antireflection films in the wavelength range of 1000-1100 nm.
2. The low-threshold, two-stage spectrally shaped flexible fiber high-power mode-locked laser of claim 1, wherein: the flexible double-cladding gain fiber is ytterbium-doped large-core gain fiber.
3. The low-threshold, two-stage spectrally shaped flexible fiber high-power mode-locked laser of claim 1, wherein: the first end cap and the second end cap are both multimode quartz rods.
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