CN100437323C - Double cladding large mode field area Yb-doped photon crystal optical fiber femtosecond laser - Google Patents
Double cladding large mode field area Yb-doped photon crystal optical fiber femtosecond laser Download PDFInfo
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- CN100437323C CN100437323C CNB2007100575583A CN200710057558A CN100437323C CN 100437323 C CN100437323 C CN 100437323C CN B2007100575583 A CNB2007100575583 A CN B2007100575583A CN 200710057558 A CN200710057558 A CN 200710057558A CN 100437323 C CN100437323 C CN 100437323C
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Abstract
The invention discloses a double-coating large-mode-area photon crystal flysecond laser directly obtaining micro joule-level single pulse energy, belonging to the field of laser technique and nonlinear optics, where the laser main body is based on double-coating large-mode-area photon crystal optical fiber of polarization-protection structure and adopts high-power LD laser to directly pump; the laser uses grating pair to compensate dispersion, starts mode locking with the help of semiconductor saturable absorber mirror (SESAM), and controls polarization by wave plate and polarization beam splitter and implements tunable output; laser resonant cavity keeps net positive dispersion inside and runs in self-similar mode locking mode and outside-cavity dispersion compensation is made on the output pulse and the pulse is 100-200fs wide. And the advantages: the laser has good stability, and the output pulse has high energy and high repeating frequency. And the invention can effectively avoid split of pulse running at high energy.
Description
Technical field
The present invention relates to a kind of double cladding large mode field area Yb-doped photon crystal optical fiber femtosecond laser, belonged to laser technology and non-linear optical field.
Background technology
It is stable that ultrashort pulse fiber laser has running, and the integrated level height is cheap, the outstanding advantage that waits easy to maintenance, and extensively commercialization at present, in optical communication, the fields such as exploration of ultrafast phenomena have a wide range of applications in life science and the basic science.Ultrashort pulse fiber laser general using passive mode-locking obtains the laser pulse of femtosecond magnitude.The passive mode-locking mode of ultrashort pulse fiber laser has nonlinear polarization rotation locked mode, nonlinear optical fiber annular mirror locked mode, several modes such as semiconductor saturable absorbing mirror (SESAM) locked mode.Nonlinear polarization rotation locked mode need add many polarization control components in light path, adjust relatively difficulty, and this locked mode mode is saturated easily under the high impulse energy, therefore is only applicable to low pulse energy ultrashort pulse fiber laser.The repetition frequency of the ultrashort pulse fiber laser of nonlinear optical fiber annular mirror locked mode is difficult to control, less stable.Semiconductor saturable absorbing mirror is based on a semiconductor saturable absorber that is integrated on the completely reflecting mirror, compact conformation is easy to adjust, and can realize the self-starting of locked mode, make the laser pulse of laser instrument acquisition femtosecond magnitude simultaneously, be very suitable for the locked mode of ultrashort pulse fiber laser.Single pulse energy is an important indicator of weighing the ultrashort pulse fiber laser performance.Single pulse energy based on the ultrashort pulse fiber laser of traditional fiber can be subjected to following two aspect factors restrictions.The first, this fiber laser must use lower powered single mode laser diodes laser instrument (LD) pumping, has limited the injection level of energy.The second, the fibre core of traditional fiber is very little, makes that the nonlinear effect when high-octane ultrashort pulse is transmitted in optical fiber is stronger, and this can cause the pulse division, thereby destroys the stability of ultrashort pulse fiber laser running.Based on the reason of this two aspect, the single pulse energy of traditional ultrashort pulse fiber laser is generally in skin joule (pJ) magnitude, and the highest also have only several receive joule (nJ).In order to obtain higher pulse energy, often need amplifier stage that the ultrashort pulse of laser instrument output is amplified, and amplification process has not only increased the cost of laser system, sacrificed its ease for use, and shape that can paired pulses and the stability of repetition frequency causes certain destruction, limited its range of application to a great extent.Therefore, direct ultrashort laser pulse output from laser instrument acquisition high impulse energy has outstanding realistic meaning.The double clad structure provides possibility for the single pulse energy that improves ultrashort pulse fiber laser.This optical fiber is by fibre core, and inner cladding and surrounding layer constitute.Doping gain ion in the fibre core, laser transmits in fiber core with single-mold and amplifies, and inner cladding also is the fibre core of pump light as the fibre core covering simultaneously, allows the high-power LD pump light of multimode directly to inject, and surrounding layer plays the effect of pump light covering.In order further to reduce the non-linear of doubly clad optical fiber, need improve the diameter of fibre core greatly.In the inner cladding of doubly clad optical fiber and surrounding layer, introduce the airport structure of periodic arrangement, promptly obtain double-clad photon crystal optical fibre.Under certain airport size and pitch of holes situation, this photonic crystal fiber can provide than the mode field area of the big order of magnitude of traditional fiber and keep the single mode running, thereby in sacrificial light beam quality not, reduce non-linear in the optical fiber effectively, reach the purpose that improves the laser instrument single pulse energy.By to deep the discovering of ultrashort pulse fiber laser operative mechanism, the restriction that the non-linear pulsed energy of optical fiber improves is caused by the pulse division, and pulse division and pulse shape are closely related.Traditional ultrashort pulse fiber laser turns round in orphan's locked mode mode, and pulse shape is hyperbolic secant shape, and the non-linear chirp of its introducing can cause the pulse division.If make laser works in the self similarity mode-lock status, can obtain parabola shaped pulse shape, and linear chrip is supported in the pulse of this shape, under very strong nonlinear fiber effect, pulse can not divided yet, thereby can make single pulse energy that fiber laser obtains at least than the high order of magnitude of traditional fiber laser.Another important indicator of fiber laser is exactly its stability.Environmental impact around the running of tradition ultrashort pulse fiber laser is subjected to is very big, and the enhancing polarization property that the double cladding large mode field area photonic crystal fiber can provide simultaneously makes the running of this fiber laser can obtain splendid stability.About the document that relates to the technology of the present invention and report as follows:
[1]B.Ortac，A.Hideur，C.Chedot，et.al.，“Self-similar?low-noise?femtosecond?ytterbium-dopeddouble-clad?fiber?laser”，Appl.Phys.B，vol.85，pp.63-67，2006；
[2]C.K.Nielsen，B.Ortac，T.Schreiber，et.al.，″Self-starting?self-similar?all-polarization?maintainingYb-doped?fiber?laser″，Opt.Express.，vol.13，pp.9346-9351，2005；
[3]F.
Ilday，J.R.Buckley，W.G.Clark，et.al.，″Self-Similar?Evolution?of?Parabolic?Pulses?in?aLaser″，Phys.Rev.Lett.，vol.92，pp.213902-1，2004；
[4]T.Schreiber，F.
O.Schmidt，et.al，“Stress?induced?single-polarization?single-transversemode?photonic?crystal?fiber?with?low?nonlinearity，”Opt.Express.，vol.13，pp.7621-7630，2005；
[5]Jens?Limpert，Fabian?
Thomas?Schreiber，et.al，″High-Power?Ultrafast?Fiber?LaserSystems″，IEEE?J.Sel.Top.Quantum.Electron.，vol.12，pp.233-244，2006；
Summary of the invention
The object of the present invention is to provide a kind of direct acquisition single pulse energy is the double cladding large mode field area Yb-doped (Yb of little joule (μ J)
3+) photon crystal optical fiber femtosecond laser.
The present invention is realized by following technical proposals: a kind of double cladding large mode field area Yb-doped photon crystal optical fiber femtosecond laser, this laser instrument by diode laser (LD) 1 as pumping source, in the pumping light path, set gradually the non-spherical lens 2 that is used to collimate pump light, dichroic mirror 3, coupling focuses on non-spherical lens 4, and non-spherical lens 4 injects double cladding large mode field area Yb-doped photonic crystal fiber 9 with pump light.The right side of photonic crystal fiber 9 is as output light path, and the left side is as the dispersion compensation light path.Set gradually non-spherical lens 10 in the output light path, half-wave plate 11, polarization beam apparatus 12, quarter-wave plate 13, non-spherical lens 14 and semiconductor saturable absorbing mirror (SESAM) 15.Set gradually half-wave plate 5 in the dispersion compensation light path, grating 6,7, completely reflecting mirror 8, thus having constituted with photonic crystal fiber 9, completely reflecting mirror 8 and SESEAM are the standing wave type laserresonator of main body.Laser is derived by the output terminal of polarization beam apparatus 12, sets gradually half-wave plate 16 in the output light path, grating 18,19, and completely reflecting mirror 20 and completely reflecting mirror 17, they constitute the outer chromatic dispersion bucking-out system of resonator cavity of laser instrument.It is characterized in that: LD 1 adopts optical fiber output, and the core diameter of output tail optical fiber is 200～400 μ m, and numerical aperture NA is 0.2～0.4, and output wavelength is 976～980nm, and output power is 5～30W.Dichroic mirror 3 is 15 degree angles with pump light, for wavelength be the pump light transmitance of 976～980nm greater than 98%, be that the laser reflectivity of 1～1.1 μ m is greater than 95% for wavelength.Double cladding large mode field area Yb-doped (Yb
3+) photonic crystal fiber 9 length are 4～6 meters, fibre core numerical aperture NA is 0.03～0.06, the single mode scene is amassed 500～1000 μ m
2To 976～980nm pump light absorption coefficient is 8～15dB/m, inner cladding is the airport structure of arranging in 4～6 layers of regular hexagon cycle, the numerical aperture NA of inner cladding is 0.45～0.8, the fibre-optical bending diameter is 20～40cm, two end face airports of optical fiber are subsided, the length of subsiding 200～500 μ m, and the plane that fiber end face is vertical with fiber axis is 8～15 degree angles.The service band of semiconductor saturable absorbing mirror 15 is 1～1.1 μ m, and saturated can stream be 120～200 μ J/cm
2, depth of modulation is 10%～40%.The extinction ratio of two vertical polarization attitudes of 12 couples 1～1.1 μ m of polarization beam apparatus laser reaches 1000: 1.Non-spherical lens 2 focal lengths are 10～20mm, and numerical aperture NA is identical with the numerical aperture of LD tail optical fiber. Non-spherical lens 4,10 focal lengths are 8～15mm, and the numerical aperture of non-spherical lens 4 is identical with the inner cladding numerical aperture of photonic crystal fiber, and the numerical aperture of non-spherical lens 10 is identical with the numerical aperture of photonic crystal fiber fibre core.Non-spherical lens 14 focal lengths are 100～200mm, and all aspherical lens surface are plated broad-band transparence-increased film, to 976～1100nm laser-transmitting rate greater than 99.5%.Grating 6,7 parallel placements, grating 18,19 parallel placements, all grating line density are 600/mm, and blaze wavelength is 1 μ m, and surface gold-plating, 1 order diffraction efficient be greater than 90%, and insert light path with Li Teluo angle (Littrow).Completely reflecting mirror 17 is 45 degree with light path to be placed, and the reflectivity of laser that to wavelength is 1～1.1 μ m is greater than 99%.Completely reflecting mirror 8,20 is placed perpendicular to light path, and the reflectivity of laser that to wavelength is 1～1.1 μ m is greater than 99%.
Compare with the ultrashort pulse fiber laser of reporting in the past, technical scheme of the present invention has following advantage:
1. the main body of laser instrument is based on the double cladding large mode field area Yb-doped (Yb that protects inclined to one side structure
3+) photonic crystal fiber, have good polarization retention performance, have good stability during running.The single mode scene of optical fiber is amassed 500～1000 μ m
2, nonlinear factor is lower more than 10 times than ordinary optic fibre, and the single pulse energy that can support is also high more than 10 times than traditional fiber laser instrument accordingly.
2. protect the double cladding large mode field area Yb-doped (Yb of inclined to one side structure
3+) photonic crystal fiber has the orthodox material chromatic dispersion, can make pulse strenching, and is unfavorable to obtaining femtosecond pulse.Therefore in laser cavity, introduce grating pair as dispersive compensation element,, can obtain adjustable anomalous dispersion, obtain femtosecond pulse by adjusting the spacing of grating pair.If the interval of grating pair in the accurate control chamber, part compensates the normal dispersion of photonic crystal fiber, and the net dispersion amount is controlled at 0.015～0.03ps
2Between, can realize self similarity (self-similar) locked mode, the time domain pulse of hyperbolic secant type and the spectral shape that are obtained with traditional ultrashort pulse fiber laser are different, the present invention obtains parabolic type pulse shape, linear chrip and parabolic type spectral shape, thereby effectively avoid the pulse division, support single pulse energy up to little joule.Output laser is through grating pair outside the chamber, and linear chrip can obtain full remuneration, obtains little joule of magnitude of single pulse energy, pulse width 100～200fs, and repetition frequency 10～30MHz, frequency spectrum is in the ultrashort laser pulse of 1～1.1 mu m waveband.
Description of drawings
Fig. 1 is double cladding large mode field area Yb-doped (Yb of the present invention
3+) the photon crystal optical fiber femtosecond laser structural representation.
Among the figure: 1 is the LD pumping source; 2 are the collimation non-spherical lens; 3 is dichroic mirror; 4 and 10 are coupling, focusing non-spherical lens; 14 for focusing on non-spherical lens; 5,11 and 16 is half-wave plate; 13 is quarter-wave plate; 12 is polarization beam apparatus; 6 and 7 is grating pair; 18 and 19 also is grating pair; 8 and 20 is 0 degree total reflective mirror; 17 is 45 degree total reflective mirrors; 9 is photonic crystal fiber; 15 is semiconductor saturable absorbing mirror (SESAM).
Fig. 2 is the end face scanning electron microscope microphoto of photonic crystal fiber 9 among Fig. 1.
Fig. 3 subside for photonic crystal fiber end face airport and angle polishing after the side microphoto.
Parabolic type time domain pulse waveform that Fig. 4 produces for the laser instrument of the present invention of numerical simulation and the corresponding linear curve of warbling.
Fig. 5 is the parabolic type frequency spectrum that the laser instrument of the present invention of numerical simulation produces.
Fig. 6 is time domain pulse wave and accordingly the warble curve of laser instrument output pulse of the present invention after the grating pair compression of numerical simulation.
Embodiment
Obtain the double cladding large mode field area Yb-doped (Yb of high impulse energy
3+) specific embodiments of photon crystal optical fiber femtosecond laser is as follows: at first utilize the tail optical fiber of the accurate fiber adjusting mount fixed L D laser instrument 1 of five dimensions, realize tail optical fiber about, about, the precision adjustment at front and back and angle of inclination.Regulate tail optical fiber, make its exit end be positioned at the focus of non-spherical lens 2, fully collimate pump light.The core diameter of LD 1 output tail optical fiber is 200～400 μ m, and numerical aperture NA is 0.2～0.4, and output wavelength is 976～980nm, and output power is 5～30W.Use aspheric mirror to focus on, collimate and effectively to avoid spherical aberration, obtain the hot spot of diffraction limit.Non-spherical lens 2,4,10,14 all is coated with the high saturating broadband deielectric-coating of 976～1100nm wave band, and transmissivity is greater than 99.5%, and is fixed on the precision one-dimensional micro-displacement platform, is used for accurately regulating collimation and focusing on.The focal length of non-spherical lens 2 is 10～20mm, and numerical aperture NA is identical with the numerical aperture of LD tail optical fiber.Dichroic mirror 3 is placed after the non-spherical lens 2, and be 15 degree with pump light and place, angle is placed according to this, dichroic mirror for wavelength be the pump light transmitance of 976～1100nm greater than 98%, be that the laser reflectivity of 1～1.1 μ m is greater than 95% for wavelength.Insert non-spherical lens 4 after dichroic mirror, pump light is focused to photonic crystal fiber 9, non-spherical lens 4 focal lengths are 8～15mm, and numerical aperture is identical with the inner cladding numerical aperture of photonic crystal fiber.Double cladding large mode field area Yb-doped (Yb
3+) photonic crystal fiber can be divided into fibre core, interior guarantor's layer, surrounding layer three parts.Fibre core doping gain media Yb
3+, numerical aperture NA is 0.03～0.06.The airport that inner cladding was arranged by 4～6 layers of regular hexagon cycle constitutes, and changes the covering equivalent refractive index by spacing and the airport size of controlling airport, thereby makes optical fiber keep single mode under the situation of big mode field area, and the single mode scene is amassed 500～1000 μ m
2, simultaneously, the fibre-optical bending diameter is 20～40cm, utilizes the bending loss characteristics bigger than basic mode of optical fiber high-order mode formula, suppresses high-order mode.Inner cladding is also as multimode pumping fibre core, and numerical aperture NA is 0.45～0.8.Inner cladding is introduced the stress birefrin structure simultaneously, makes the polarization rejection ratio of optical fiber reach 10dB.Pump light is subjected to the constraint of surrounding layer airport and only transmits in inner cladding, is fully absorbed by the fibre core dopant ion to guarantee its energy, and it is 8～15dB/m to 976～980nm pump light absorption coefficient.Intercept 4～6 meters photonic crystal fibers, the airport of two end faces is subsided by the optical fiber splicer effluve, utilizes the optic fiber polishing machine sanding and polishing to become 8～15 degree angles afterwards, thereby plays the effect that suppresses self-sustained oscillation and end face feedback.Utilize the accurate fiber adjusting mount of five dimensions that the optical fiber two ends are fixed, regulate optical fiber, be located at the focus of non-spherical lens 4, finely tune the highest until the coupling efficiency of pump light.The other end of optical fiber inserts non-spherical lens 10, and focal length is 8～15mm, and its numerical aperture is identical with photonic crystal fiber fibre core numerical aperture.Strengthen pump power this moment, have the outgoing of spontaneous radiation fluorescence from two end faces of optical fiber, non-spherical lens 4 collimations of wherein leading up to are reflected by dichroic mirror 3 then, another road is by non-spherical lens 10 collimations, insert completely reflecting mirror respectively as end mirror in dichroic mirror 3 and non-spherical lens 10 back, fine setting two sides end mirror is in fluorescence reflected back optical fiber, promptly obtain simple resonator cavity, can realize the laser operation of continuous wave (CW) this moment.With the photonic crystal fiber is the boundary, and this moment, laser resonant cavity can be divided into two arms, inserted half-wave plate 5 successively in the light path of an arm therein, grating 6,7.Insert half-wave plate 11 in the light path of another arm successively, polarization beam apparatus (PBS) 12, quarter-wave plate 13, non-spherical lens 14, and replace another end mirror with SESAM.Grating 6,7 inserts light path to reduce loss with Li Teluo angle (Littrow), and other original papers all insert with the direction perpendicular to optical axis.The grating pair of parallel placement can be introduced anomalous dispersion, and grating pair is big more at interval, and the negative dispersion amount that is produced is big more, thereby plays the effect of chamber internal dispersion compensation.Grating is fixed on the one dimension precision micro-displacement platform, is used to finely tune distance.Grating 6,7 incisure densities are 600/mm, and blaze wavelength is 1 μ m, and 1 order diffraction efficient is greater than 90%, and surface gold-plating is to improve reflectivity.Grating diffration efficient is very responsive to incident light polarization state, and rotation half-wave plate 5 can excite the polarization state that makes grating obtain maximum diffraction efficient.The service band of SESAM is 1～1.1 μ m, and saturated can stream be 120～200 μ J/cm
2, depth of modulation is 10%～40%, is fixed on the copper adjustment rack, to reach better heat radiating effect.By regulating SESAM and being distance between the aspheric surface condenser lens of 100～200mm at the focal length of its front, thereby change the focal beam spot size on the SESAM, reaching the saturated of SESAM can flow, thereby makes laser instrument realize the self-starting locked mode, turns round to mode locking pulse from the CW run transition.All wave plates and polarization beam apparatus all are coated with 1～1.1 μ m laser transmittance greater than 99.5% broad-band transparence-increased film, and polarization beam apparatus reaches 1000: 1 to the extinction ratio of two vertical polarization attitudes of 1～1.1 μ m laser.Wave plate is fixed on the rotatable adjustment rack, and polarization beam apparatus is fixed on the horizon prism frame.Half-wave plate 11 combines the effect of playing control laser instrument polarization state with polarization beam apparatus 12, make laser instrument only excite along the laser of optical fiber slow axis polarization, and makes from the optical fiber emitting laser fully through polarization beam apparatus.Regulate quarter-wave plate 13 and can control the coupling output rating of laser instrument.The laser that sees through polarization beam apparatus through the SESAM reflection, and passes through quarter-wave plate by quarter-wave plate once more, polarization state is changed, thereby makes a part of light transmission PBS, is coupled to optical fiber again, continuation is vibrated in the chamber, another part light laser cavity that then is reflected out.The laser pulse of polarization beam apparatus output is via half-wave plate 16, grating pair 18,19 compensation of dispersion outside the chamber, and return along being lower than the surface level of input path and being parallel to input path by total reflective mirror 20, once more through grating pair 18,19 compensation of dispersion, by 45 degree catoptrons 17 laser is derived at last.The effect of half-wave plate 16 and half-wave plate 5 are identical.The parameter of grating 18,19 and effect and grating 6,7 are identical.Generally speaking, laser instrument turns round in orphan's locked mode mode, grating pair 6,7 overcompensations this moment the material dispersion of photonic crystal fiber, be clean anomalous dispersion in the chamber.Utilize spectroanalysis instrument to observe the spectrum of hyperbolic secant shape from laser output, utilize autocorrelator to observe its output pulse, pulsewidth is 100～200fs.But the energy of pulse is seriously limited, strengthens pump power, can make locked mode become unstable.Reduce the interval between the grating pair 6,7 this moment, reaches clean normal dispersion in laser cavity, and the net dispersion amount is 0.015～0.03ps
2Between, can observe Parabolic spectral shape on the spectrometer this moment, and promptly laser instrument turns round in self similarity locked mode mode.Strengthen pump power, laser instrument still can steady running, and single pulse energy can reach little joule.The pulse meeting of output is wide during than orphan's locked mode, in the ps magnitude, and follows linear chrip.By adjusting the spacing of the outer grating pair in chamber, linearity that can full remuneration output pulse is just warbled, the pulse width of acquisition Fourier transform limit, and pulse width is 100～200fs.
Claims (1)
1. double cladding large mode field area Yb-doped photon crystal optical fiber femtosecond laser, this laser instrument by diode laser (1) as pumping source, in the pumping light path, set gradually pump light collimation non-spherical lens (2), dichroic mirror (3) and pump light coupling non-spherical lens (4), pump light coupling non-spherical lens (4) injects double cladding large mode field area Yb-doped photonic crystal fiber (9) with pump light, the end that the pump light injection is arranged of photonic crystal fiber (9) is as the dispersion compensation light path within the resonator cavity, the other end is as output light path, the dispersion compensation light path polarization state of inserting successively in the dispersion compensation light path within the resonator cavity within the resonator cavity is regulated half-wave plate (5), Dispersion Compensation Grating within the resonator cavity is to (6,7) the dispersion compensation light path completely reflecting mirror (8) within the resonant cavity, set gradually laser coupled non-spherical lens (10) in the output light path, the output light path polarization state is regulated half-wave plate (11), polarization beam apparatus (12), quarter-wave plate (13), semiconductor saturable absorbing mirror focuses on non-spherical lens (14) and semiconductor saturable absorbing mirror (15), thereby has constituted with photonic crystal fiber (9), dispersion compensation light path completely reflecting mirror (8) within the resonator cavity and semiconductor saturable absorbing mirror (15) are the standing wave type laserresonator of main body; Laser is exported to outside the resonator cavity by the output terminal of polarization beam apparatus (12), regulate half-wave plate (16) in the polarization state that sets gradually outside the resonator cavity outside the resonator cavity, Dispersion Compensation Grating outside the resonator cavity is to (18,19), completely reflecting mirror outside the resonator cavity (20) and coupling output completely reflecting mirror (17), Dispersion Compensation Systems outside the resonator cavity of their formation laser instruments, it is characterized in that: it is 200～400 μ m that diode laser (1) adopts core diameter, numerical aperture is 0.2～0.4 optical fiber output, the output wavelength of diode laser (1) is 976～980nm, and the output power of diode laser (1) is 5～30W; Dichroic mirror (3) and pump light are 15 degree angles, dichroic mirror (3) for wavelength be the transmitance of pump light of 976～980nm greater than 98%, dichroic mirror (3) is that the reflectivity of laser of 1～1.1 μ m is greater than 95% for wavelength; The length of double cladding large mode field area Yb-doped photonic crystal fiber (9) is 4～6m, and the numerical aperture of the fibre core of photonic crystal fiber (9) is 0.03～0.06, and the single mode scene of photonic crystal fiber (9) is long-pending to be 500～1000 μ m
2Photonic crystal fiber (9) is that the absorption coefficient of the pump light of 976～980nm is 8～15dB/m for wavelength, the inner cladding of photonic crystal fiber (9) is the airport structure of arranging in 4～6 layers of regular hexagon cycle, the numerical aperture of the inner cladding of photonic crystal fiber (9) is 0.45～0.8, the bending diameter of photonic crystal fiber (9) is 20～40cm, two end face airports of photonic crystal fiber (9) are subsided, the length of subsiding is 200～500 μ m, and the end face of photonic crystal fiber (9) is 8～15 degree angles with the axial vertical plane of photonic crystal fiber (9); The operation wavelength of semiconductor saturable absorbing mirror (15) is 1～1.1 μ m, and the saturated of semiconductor saturable absorbing mirror (15) can stream be 120～200 μ J/cm
2, the depth of modulation of semiconductor saturable absorbing mirror (15) is 10%～40%; Polarization beam apparatus (12) is that the extinction ratio of two vertical polarization attitudes of the laser of 1～1.1 μ m reaches 1000: 1 for wavelength; The focal length of pump light collimation non-spherical lens (2) is 10～20mm, the numerical aperture of pump light collimation non-spherical lens (2) is identical with the numerical aperture of the output optical fibre of diode laser (1), pump light coupling non-spherical lens (4) is 8～15mm with the focal length of laser coupled non-spherical lens (10), the numerical aperture of pump light coupling non-spherical lens (4) is identical with the inner cladding numerical aperture of photonic crystal fiber, and the numerical aperture of laser coupled non-spherical lens (10) is identical with the numerical aperture of photonic crystal fiber fibre core, the focal length that semiconductor saturable absorbing mirror focuses on non-spherical lens (14) is 100～200mm, pump light collimation non-spherical lens (2), pump light coupling non-spherical lens (4), it is that the transmissivity of laser of 976～1100nm is greater than 99.5% broad-band transparence-increased film that the surface that laser coupled non-spherical lens (10) and semiconductor saturable absorbing mirror focus on non-spherical lens (14) is coated with for wavelength; Dispersion Compensation Grating within the resonator cavity is to (6,7) parallel placement and insert light path with the Li Teluo angle, Dispersion Compensation Grating outside the resonator cavity is to (18,19) parallel placement and insert light path with the Li Teluo angle, Dispersion Compensation Grating within the resonator cavity is to (6,7) Dispersion Compensation Grating outside the resonant cavity is to (18,19) grating line density is 600/mm, Dispersion Compensation Grating within the resonator cavity is to (6,7) Dispersion Compensation Grating outside the resonant cavity is to (18,19) blaze wavelength is 1 μ m, Dispersion Compensation Grating within the resonator cavity is to (6,7) Dispersion Compensation Grating outside the resonant cavity is to (18,19) surface gold-plating, the Dispersion Compensation Grating within the resonator cavity is to (6,7) Dispersion Compensation Grating outside the resonant cavity is to (18,19) 1 order diffraction efficient is greater than 90%; Coupling output completely reflecting mirror (17) is 45 degree with light path to be placed, and coupling output completely reflecting mirror (17) is that the reflectivity of laser of 1～1.1 μ m is greater than 99% for wavelength; Completely reflecting mirror (20) outside dispersion compensation light path completely reflecting mirror (8) resonant cavity within the resonator cavity is placed perpendicular to light path, and the completely reflecting mirror (20) outside dispersion compensation light path completely reflecting mirror (8) resonant cavity within the resonator cavity is that the reflectivity of laser of 1～1.1 μ m is greater than 99% for wavelength.
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