CN102185242A - Totally positive dispersion cavity mode-locked all-fiber laser - Google Patents
Totally positive dispersion cavity mode-locked all-fiber laser Download PDFInfo
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- CN102185242A CN102185242A CN201110088737XA CN201110088737A CN102185242A CN 102185242 A CN102185242 A CN 102185242A CN 201110088737X A CN201110088737X A CN 201110088737XA CN 201110088737 A CN201110088737 A CN 201110088737A CN 102185242 A CN102185242 A CN 102185242A
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Abstract
The invention discloses a totally positive dispersion cavity mode-locked all-fiber laser, which is an environmentally-stable and novel-structured totally optical mode-locked super-short laser pulse laser which works in a totally positive dispersion area, and uses rare earth-mixed optical fibers as a laser gain medium, a polarization beam splitter to split light, a band-pass long-period fiber grafting filter as a mode-locked laser centre wavelength selection and mode-locked laser spectrum filtering optical pulse compression element, and a semiconductor saturable absorber as a mode-locked element and the like to form an optical fiber laser structure with high repetition rate, high power, simple structure and high efficiency. The laser outputs picosecond and femtosecond optical pulse-width polarized laser with a wavelength of 1 mu m which, after being amplified by the high-power optical fiber amplifier, can be used for molecularly systemic pumping-detection ultrafast optical physical experiment or environment monitoring, microwave photonic or biophysical detection, double-wavelength pumping-detection ultrafast optical physical experiment, frequency-combining optical radiation generation, coherent anti-stokes Raman scattering microscopy, micromachining and the like.
Description
Technical field
The present invention relates to a kind of fiber laser, be particularly related to a kind of passive mode locking full-optical-fiber laser with high pulse repetition rate ultrashort laser pulse output, be applicable to that producing stable ultrashort laser pulse output is used for biomedical applications such as the multi-photon imaging is micro-etc. and adopts direct beat method to produce the scientific experiments such as pumping-detection that the radiation of ultrashort pulse mid-infrared laser is used for molecular system, environmental monitoring and microwave photon and biophysics detection etc. belong to the optical information technical field.
Background technology
The scientific experiments such as pumping-detection of molecular system now, environmental monitoring and microwave photon and biophysics detection etc. need the mid-infrared light source of high-average power ultrashort pulse.The development of solid laser medium such as tunable ti sapphire laser technology and harmonic frequency converter technique and optical parametric oscillation and amplifying technique in recent years, high-repetition-rate ultrashort light pulse are infrared all accomplished covering from the extreme ultraviolet of 200nm to 4 μ m.And the available wavelength of THz system surpasses 20 μ m.
In recent years, the develop rapidly of high-power fiber ultrashort light pulse laser technology provides new opportunity and possibility (H.M.Pask for the dual wavelength mixing generation high power high-repetition-rate intermediate infrared radiation light source that develops based on the optical-fiber laser technology, R.J.Carman, D.C.Hanna, A.C.Tropper, C.J.Mackechnie, P.R.Barber, and J.M.Dawes, IEEE J.Sel.Top.QuantumElectron.1,2 (1995) .) (F.Roser, J.Rothhard, B.Ortac, A.Liem, O.Schmidt, T.Schreiber, J.Limpert, and A.Tunnermann, Opt.Lett.30,2754 (2005) .).Fiber laser is because of its unique waveguiding structure has simply, high efficiency, firm, light weight, integrated, high reliability, high stability.And have the Nd that mixes of broad band laser vibration recently
3+, Pr
3+, Yb
3+, Er
3+And Tm
3+The progress of fiber laser and amplifier provides and has produced the possibility of wavelength greater than the double-wavelength short pulse laser of 1 μ m.And mix Nd
3+, Yb
3+, Er
3+And Tm
3+Optical fiber (Tm
3+＞200nm, Er
3+＞80nm) particularly mix Tm
3+Therefore optical fiber also be to produce the potential effective medium (H.M.Pask of dual wavelength femto-second laser pulse vibration because of it has very wide gain bandwidth, R.J.Carman, D.C.Hanna, A.C.Tropper, C.J.Mackechnie, P.R.Barber, and J.M.Dawes, IEEE J.Sel.Top.Quantum Electron.1,2 (1995) .).
Utilize semiconductor saturable absorber to realize that as the locked mode element it is a research field of being paid much attention to (A.Isomaki et al, Optics Express, Vol14 that passive mode locking produces ultrashort laser pulse always in fiber laser, No.20,9238,2006) (A.Chong et al, Opt.Lett., Vol.33, No.22,2638,2008), and existing great deal of research results delivers, and some commercial products are also arranged.But existing commercialization mode locked fiber laser is only exported single wavelength laser, does not still have commercialization dual wavelength mode locked fiber laser.
Nearest about being operated in the Y that mixes in Totally positive dispersion district
b 3+Optical-fiber laser bibliographical information (FrankW.Wise et al, High energy femtosecond fiber lasers based on pulsepropagation at normal dispersion, Laser ﹠amp; Photonics.Rev.2, No.1-2,58-73,2008) make the ultrashort pulse fiber laser technology of output macro-energy, Stability Analysis of Structures, practicability stride forward major step again.Although because the Totally positive dispersion cavity makes this mode locked fiber laser output have the picosecond laser pulse of positive in a large number linear Zhou pond, but can obtain the macro-energy femto-second laser pulse of transform limit outside the employing chamber after the chromatic dispersion compression, certainly because this laser adopts the mechanism of spectral filtering light pulse compression to make the spectral bandwidth of laser output be subjected to certain restriction. but, therefore be subjected to the attention of academia because this laser structure is simplified and can be realized full fiberize and export the light pulse of picosecond macro-energy locked mode.
Mix in the Yb fiber laser Totally positive dispersion cavity mode-locked, spectral filtering is in the formation of mode-locked laser pulse with to more existing bibliographical informations (the B.G.Bale et al of the influence of mode locked fiber laser stability, Spectral filtering for mode locking in the normal dispersive regime, OptLett., Vol.33, No, 9,2008,941; A.Chong et al, Properties of normal dispersionfemtosecond fiber lasers, J.O.S.A (B), Vol.25, No.2,2008,140). spectral filtering plays in Totally positive dispersion modelocked fiber laser cavity the light pulse from phase modulated pulse stretching is produced pinch effect, simultaneously in the chamber from amplitude modulation(PAM) generation effect, stability to mode-locked laser plays a part very key, and the spectral filtering that can think fit is the key technology of Totally positive dispersion mode locked fiber laser from starting of oscillation and stable mode-locking work.The spectral filtering sheet of the interferometric filter that adopts 4 to 12nm bandwidth in the Yb3+ optical-fiber laser mixing of annular chamber nonlinear polarization rotation mechanism as 2006 and U.S. Cornell university in 2007 of existing open source literature report or the birefringence quartz plate formation of different-thickness has realized that stable locked mode shakes (A.Chong et al, All Normal dispersion femtosecond fiber laser, OpticsExpress, Vol.14, No.21,2006,10095; A.Chong et al., All Normal dispersionfemtosecond fiber laser with pulses energy above 20nJ, Optics letters, Vol.32, No.16,2007,2408; K.Kieu et al.; Sub-100fs pulses at watt-level powersfrom a dissipative-soliton fiber laser; Opt Lett.; Vol.34; No.5; 2009,539), 2007-2008 US Naval Research Laboratory and the German Han Luowei Han Luowei of university laser also adopt similar locked mode mechanism the Totally positive dispersion annular chamber mix Y
b 3+Optical-fiber laser has realized that (wherein the naval laboratory is adopted and placed interferometric filter in the Totally positive dispersion annular chamber in the locked mode vibration, and German laser Han Luowei has adopted the optical fibre wavelength division multiplexer (WDM) of particular design to realize principle (the Janet W.Lou et al. that semiconductor saturable absorber starts in pulse compression and the chamber as spectral filter in the chamber respectively, Experimental measurements ofsoliton pulse characteristics from an all normal dispersion Yb-doped fiberlaser, Optics Express, Vol.15, No.8,2007,4960; O.Prochnow et al., All fibersimilariton laser at 1 μ m without dispersion compensation, Optics Express, Vol.15, No.11,2007,6889; Michael Schultz et al, All fiber Ytterbiumfemtosecond laser without dispersion compensation, Optics Express, Vol.16, No.24,2008,19562)).Totally positive dispersion to ambient stable adopts all risk insurance to mix Y partially
b 3+The mode-locked laser of optical fiber, U.S. Cornell university utilized the online property of semiconductor saturable absorber locked mode mechanism chamber guarantor to mix Y partially in 2008
b 3+Adopt the spectral filtering sheet of the birefringence quartz plate formation of 12nm to realize stable locked mode vibration (A.Chong et al. in the optical-fiber laser, Environment stable all normal-dispersionfemtosecond fiber laser, Optics letters, Vol.33, No.10,2008,1071).Laser engineering research institute of Osaka, Japan university in 2006 adopts the full polarization fibre annular-type cavity to mix the Yb fiber laser is not had tuning mode-locked laser output (the K.Sumimura et al of chamber internal dispersion compensation realization, Environmentally-stablemode-locked Yb fiber laser composed of all polarization maintaining fiberwith a broad tuning range, OSA/CLEO 2006, CThJ4.pdf).Mix Y partially and adopt in recent years to protect
b 3+The mode-locked laser of optical fiber as Germany and Denmark etc., also adopt the chamber internal dispersion compensate as diffraction grating to or photonic crystal fiber, or adopt reflective Zhou pond fiber grating (CFBG) as output coupler and dispersion compensator (T.Schreiber et al, Microj oule levelall-polarization-maintaining femtosecond fiber source, Optics letters, Vol.31, No.5,2006,574; C.K.Nielsen et al., Self-starting self-similar allpolarization maintaining Yb-doped fiber laser, Optics Express, Vol.13, No.23,2005,9346; B.Ortac et al, Experimental and numerical study ofpulses dynamics in positive net cavity dispersion mode-locked Yb-dopedfiber lasers, Optics Express, Vol.15, No.23,2007,15595; Dmitry et al., Monolithic all PM femtosecond Yb-fiber laser stabilized with a narrow-bandfiber Bragg grating and pulses-compressed in a hollow core photonic crystalfiber, Optics Express, Vol.16, No.18,2008,14004).But the locked mode in the work of the Totally positive dispersion district of above-mentioned present report is mixed in the Yb fiber laser, the Zhou pond Fiber Bragg Grating FBG (CFBG) that has adopted the interferometric filter of non-fiberize or reflection-type in the chamber is as chamber face speculum or outgoing mirror, these elements or influence the full fiberize of cavity, or influence the design of laser cavity.
Logical type fiber grating (the Long Period Grating of long period band recent years, LPG) filter progress of research (Radan Slav í k et al., Long-Period Fiber-Grating-Based Filter forGeneration of Picosecond and Subpicosecond Transform-Limited Flat-TopPulses, IEEE PHOTONICS TECHNOLOGY LETTERS, VOL.20, NO.10,2008,806; D.Nodop et.al., Long period gratings written in Large modephotonic crystal fiber, Appl.Physics.B, 92,2008,509-512) make to adopt the logical type fiber grating filter of long period band as mode-locked laser pulse compression and optical maser wavelength filtering tuned cell, be operated in the Totally positive dispersion cavity full optical fiber mode-locked laser be designed to possibility, still do not have open source literature at present but understand according to the author.
Publication number is that the output of dual wavelength linear polarization tuning laser is realized in its reflection peak position of having adopted two two spectral reflectance peaks that different polarization states had of polarization-maintaining fiber grating to pass through change pressure or temperature change polarization-maintaining fiber grating of Chinese invention patent " common polarization maintaining optical fibre grating tunable dual wavelength fibre laser " of CN101202408A.Its shortcoming is: 1. these two because the spectrum interval of the different reflection peaks (different polarization states is arranged respectively) that cause of the intrinsic big birefringence of polarization maintaining optical fibre is smaller and scope that regulate is very little; 2. owing to adopt the narrow bandwidth polarization-maintaining fiber grating, be difficult to realize that passive mode locking produces ultrashort laser pulse as the laser cavity reflecting surface; 3. this cavity body structure is fit to the tuning dual wavelength fibre laser of narrow linewidth.Publication number is the Chinese invention patent " a kind of optical fiber laser with multi-wavelength output " of CN1194453C, adopts AWG (array waveguide grating) to realize multiwavelength laser output as optical filter in the chamber.
Publication number is in the Chinese invention patent " polarization dual wavelength fiber-optical ultrashort pulse laser " of CN101510663A, proposes to utilize the mode of polarization spectro to utilize the polarization direction of two optical axis directions (fast axle and slow axis) of polarization maintaining optical fibre as the laser of two wavelength.But this technology is owing to two wavelength mode-locked lasers of fiber laser are operated in zero chromatic dispersion or approaching zero dispersion area, adopted in the laser cavity two parallel diffraction grating to or reflective Zhou pond fiber grating (CFBG) as the dispersion compensation device of two wavelength in the chamber, with the dual wavelength mode-locked laser pulse of output femtosecond pulsewidth.
Through literature search, there is following technology to relate to mode locked fiber laser, as Jian Liu, UltrshortStable Mode-locked Fiber Laser At One Micron By Using PolarizationMaintaining (PM) Fiber and Photonic Bandgap Fiber (PBF), US Patent, US2008/0151945 A1, Hong Lin, Wavelength Tunable, Polarization StableMode-locked Fiber Laser, World International Property Organization, PCT/US00/19170,2001 and O.Okhotnikov et al, A Mode-Locked Fiber Laser, World International Property Organization, PCT/FI2006/050184,2006 etc.Above-mentioned technology has adopted and has been operated in the dispersion region notion, have in the chamber solid diffraction grating to or the photon band-gap optical fiber grating carry out dispersion compensation etc., thereby this full fiberize that has also influenced laser cavity has influenced the long-time stability of mode locked fiber laser, perhaps very expensive its scope of application that influences of the cost of laser.
Summary of the invention
In order to overcome the deficiency that prior art exists, the purpose of this invention is to provide a kind of Totally positive dispersion district that is operated in, no chromatic dispersion compensating element, is realized full fiberize, practicability, the mode-locked all-fiber laser of output intensity laser pulse.
For achieving the above object, the technical solution used in the present invention is:
A kind of Totally positive dispersion cavity mode-locked all-fiber laser, it is the full fiber-optical ultrashort pulse linear laser cavity that is operated in the Totally positive dispersion district, and described linear laser cavity comprises semiconductor saturable absorber, optical-fiber laser gain media, band logical type long period fiber grating, output coupler and the second laser cavity end face of holding concurrently the first laser cavity end face locked mode using; Described band leads to the type long period fiber grating, it is the logical type long period fiber grating of band of one section centre wavelength, 1.0～1.1 μ m, bandwidth 4～12nm, or centre wavelength is that 1.0～1.1 μ m, bandwidth are two sections of the 4～12nm logical type long period fiber grating of band, and the centre wavelength difference of the logical type long period fiber grating of each section band; Described optical-fiber laser gain media is mixed the rare earth gain fibre partially for protecting.
The fine linear laser cavity of this Totally positive dispersion cavity mode-locked all has following three kinds of concrete structures:
The structure of first kind of linear laser cavity is:
Semiconductor saturable absorber is bonded on the fiber end face of wavelength division multiplexer and produces the locked mode light pulse;
A pumping source provides pump light for wavelength division multiplexer, as input pumping light;
Wavelength division multiplexer with protect inclined to one side rare earth doped fiber and be connected the pumping laser that is used for pumping source and be input to the inclined to one side rare earth doped fiber of guarantor and produce laser gain;
One end of a logical type long period polarization-maintaining fiber grating of band is connected with the other end of protecting inclined to one side gain fibre;
One is had only an end of the fiber coupler of single polarization axle concussion output to be connected with the other end of the logical type long period fiber grating of band;
A total reflection chamber mirror is connected with the other end of output coupler.
The structure of second kind of linear laser cavity is:
The coupling mirror of a partial reflectance is connected with the signal input optical fibre of protecting inclined to one side 980/1064 wavelength division multiplexer;
The pumping laser of 976nm optical fiber coupling is connected with the pumping laser input optical fibre of inclined to one side 980/1064 wavelength division multiplexer of guarantor pumping laser is input in the laser chamber;
Protect the inclined to one side Y that mixes for one section
b 3+One end of gain fibre is connected with the other end of protecting inclined to one side 980/1064 wavelength division multiplexer, and this link is the common terminal of signal laser and pumping laser input;
Protect the inclined to one side Y that mixes
b 3+The other end of gain fibre closes bundle one word end polarization maintaining optical fibre with polarization beam apparatus and is connected, and polarization beam apparatus with two polarization direction different wavelength of laser separately;
One end of the attenuator of two polarization maintaining optical fibre couplings is connected with two polarization direction coupled fibers of polarization beam apparatus respectively, and two attenuators are regulated the net gain balance of two wavelength lasers in the laser cavity respectively;
The other end of the attenuator of polarization maintaining optical fibre coupling is that 4 ends that arrive the logical type long period polarization-maintaining fiber grating of band of 12nm connect with two different centre wavelengths, bandwidth respectively, and the function of the logical type long period polarization-maintaining fiber grating of band is that selection and two wavelength mode-locked laser spectral filtering light pulses of dual-wavelength laser centre wavelength are compressed;
Two semiconductor saturable absorber respectively with the other end optical fiber of two logical type long period polarization-maintaining fiber gratings of band by coupling optical system or directly be connected by optical cement, semiconductor saturable absorber is served as the cavity reflecting element of locked mode element and laser.
The structure of the third linear laser cavity is:
The coupling mirror of a partial reflectance closes bundle one word end polarization maintaining optical fibre with polarization beam apparatus and is connected;
The signal input optical fibre of two polarization maintaining optical fibre 980/1064 wavelength division multiplexers is connected with two polarization direction coupled fibers of polarization beam apparatus respectively;
The 976nm pumping laser of two optical fiber couplings is connected with two pumping laser input optical fibres of protecting inclined to one side 980/1064 wavelength division multiplexer respectively, and pumping laser is input in the laser chamber;
The guarantor of two sections different lengths mixes Y partially
b 3+One end of gain fibre is connected with two other ends of protecting inclined to one side 980/1064 wavelength division multiplexer respectively, and this end is signal laser and the public end of pumping laser, protects and mixes Y partially
b 3+Gain fibre produces laser gain under the pumping laser effect;
The guarantor of two sections different lengths mixes Y partially
b 3+The other end of gain fibre is that 4 ends that arrive the logical type long period polarization-maintaining fiber grating of band of 12nm connect with two different centre wavelengths, bandwidth respectively, and the effect of the logical type long period polarization-maintaining fiber grating of band is that the selection of dual-wavelength laser centre wavelength and the spectral filtering light pulse of two wavelength mode-locked lasers are compressed;
Two semiconductor saturable absorber respectively with the other end optical fiber of the logical type long period polarization-maintaining fiber grating of band of two sections different centre wavelengths by coupling optical system or directly connect by optical cement, semiconductor saturable absorber is served as locked mode element and a laser cavity reflecting element.
A kind of Totally positive dispersion cavity mode-locked all-fiber laser, it is the non-polarization-maintaining fiber coil die cavity of the ultrashort pulse laser that is operated in the Totally positive dispersion district, and described ring-like cavity laser comprises that the 976nm of isolator, optical fiber polarization controller, band optical fiber coupling output of optical fiber coupling or 915nm pump laser, 976/1060nm or 915/1064nm wavelength division multiplexer, common single mode mix Y
b 3+The polarization beam apparatus of optical-fiber laser gain media, a section single-mould fiber, a logical type long period fiber grating of single mode band and an optical fiber coupling; Described single mode band leads to the type long period fiber grating, and its centre wavelength is that 1.0～1.1 μ m, bandwidth are 4～12nm; The structure of this laser is:
An optical fiber polarization controller is connected with the isolator of optical fiber coupling, and isolator guarantees the unidirectional formation laser generation of optic fiber ring-shaped cavity, and optical fiber polarization controller is regulated and control chamber inner laser polarization;
The signal input part of one 980/1060 wavelength division multiplexer is connected with optical fiber polarization controller;
The pumping laser of optical fiber coupling is connected with the pumping laser input of 980/1060 wavelength division multiplexer in the pumping laser coupled into optical fibres loop laser chamber;
One end of single mode doped fiber gain media mixes end with the signal laser of 980/1060 wavelength division multiplexer/pumping laser and is connected, and gain media produces the signal laser gain under pumping laser;
One end of one section general single mode fiber is connected with the other end of doped fiber gain media;
One end of the logical type long period fiber grating of single mode band is connected with the other end of one section general single mode fiber;
One end of another optical fiber polarization controller is connected with the other end of a logical type long period fiber grating of band, and optical fiber polarization controller is regulated and control chamber inner laser polarization;
The input optical fibre end of the polarization beam apparatus of an optical fiber coupling is connected with the other end of optical fiber polarization controller;
An output optical fiber of the input of the isolator of optical fiber coupling and optical fiber coupling polarization beam apparatus connects and composes a unidirectional loop fiber laser cavity, and another output optical fiber of optical fiber coupling polarization beam apparatus is as the output port of locked mode annular cavity laser.
A kind of Totally positive dispersion cavity mode-locked all-fiber laser, it is the ultrashort pulse full polarization fiber ring-type cavity laser that is operated in the Totally positive dispersion district, and described ring-like cavity laser comprises that a fiber end face is pasted with the polarization maintaining optical fibre loop device of semiconductor saturable absorber, polarization fiber isolator, polarization maintaining optical fibre gain medium, the logical type long period polarization-maintaining fiber grating filter of band and output coupler; Described band leads to the type long period optical fiber grating filter, and its centre wavelength is that 1.0～1.1 μ m, bandwidth are 4～12nm; Described optical-fiber laser gain media adopts one section guarantor to mix the rare earth gain fibre partially as gain media; The structure of this laser is:
A pumping source provides pump light for wavelength division multiplexer, as input pumping light;
A wavelength division multiplexer is connected the inclined to one side rare earth doped fiber of pumping laser input guarantor that is used for pumping source and produces laser gain with the inclined to one side rare earth doped fiber of guarantor;
One end of a logical type long period polarization-maintaining fiber grating of band is connected with the other end of protecting inclined to one side gain fibre, the function of the logical type long period polarization-maintaining fiber grating of band is the selection and the pulse compression of locked mode spectrum of mode-locked laser pulse centre wavelength, realizes the steady operation of mode-locked laser;
One is had only an end of the fiber coupler of single polarization axle concussion output to be connected with the other end of the logical type long period fiber grating of band, and mode-locked laser pulse is exported from fiber coupler;
The first end optical fiber of a polarization maintaining optical fibre loop device is connected with the other end of fiber coupler;
The second end optical fiber of a polarization maintaining optical fibre loop device and a semiconductor saturable absorber are by optical lens or directly be connected with optical cement, and semiconductor saturable absorber produces mode-locking effect to the nonlinear interaction of laser and forms ultrashort laser pulse in annular cavity laser;
The 3rd end optical fiber of a polarization maintaining optical fibre loop device is connected with the isolator of a polarization maintaining optical fibre coupling, and isolator makes the unidirectional generation laser of doped fiber ring laser shake;
The output optical fiber of isolator is connected with the other end optical fiber of wavelength division multiplexer, constitutes loop laser complete, unidirectional concussion a chamber.
It is that common single mode or single mode are protected inclined to one side rare earth doped fiber that guarantor described in the technical solution of the present invention mixes the rare earth gain fibre partially, or adopts the big core diameter single-mode polarization maintaining optical fibre of mixing rare earth of two multiple layer pumping, or mixes guarantor's core diameter single-mode photonic crystal fiber bigger than normal of rare earth; The described rare earth of mixing is for mixing Nd
3+, Yb
3+
Compared with prior art, the present invention has the tangible advantage of several respects:
1. in the annular chamber mode locked fiber laser, adopt the logical type long period fiber grating of single mode band, whole laser works is in the Totally positive dispersion district, no free space dispersion compensation device or photonic crystal dispersion compensating fiber in the chamber, realized full optical fiber integration structure, this means more stable, the more practicability, and exportable bigger pulsed laser energy of laser cavity.
2. adopt the logical type long period polarization-maintaining fiber grating of band in the linear cavity locked mode polarization-maintaining fiber laser, whole laser works is in the Totally positive dispersion district, laser design is more simplified, realized full optical fiber integration, this also means more stable, the practicability more of laser cavity, real ambient stableization, and exportable bigger pulsed laser energy.
3. in linear cavity locked mode dual wavelength fibre laser, adopt the logical type long period polarization-maintaining fiber grating of band, whole two optical maser wavelength mode-locked lasers are operated in the Totally positive dispersion district, laser design is more simplified, realized full optical fiber integration, this also means more stable, the practicability more of laser cavity, real ambient stableization, and exportable bigger dual-wavelength laser pulse energy.
Description of drawings
Fig. 1 is that the structure of the Totally positive dispersion cavity mode-locked all-fiber laser that provides of embodiment 1 is formed schematic diagram;
Fig. 2 is that the structure of the Totally positive dispersion cavity mode-locked all-fiber laser that provides of embodiment 2 is formed schematic diagram;
Fig. 3 is that the structure of the Totally positive dispersion cavity mode-locked all-fiber laser that provides of embodiment 3 is formed schematic diagram;
Fig. 4 is that the structure of the Totally positive dispersion cavity mode-locked all-fiber laser that provides of embodiment 4 is formed schematic diagram;
Fig. 5 is that the structure of the Totally positive dispersion cavity mode-locked all-fiber laser that provides of embodiment 5 is formed schematic diagram.
Among the figure: the semiconductor saturable absorber element that 0 (01,02), locked mode are used; 1 (101,102), the logical type long period polarization-maintaining fiber grating of band; 10, the logical type long period fiber grating of common single mode band; 2, polarization maintaining optical fibre coupling polarization beam apparatus; 3 (301,302), guarantor mix Y partially
b 3+Gain fibre; 30, common single mode is mixed Y
b 3+Gain fibre; 4 (401,402), polarization maintaining optical fibre 976/1064 wavelength division multiplexer; 40, monomode fiber 976/1064 wavelength division multiplexer; 5 (51,52), 976nm pumping laser (source); 6, partial reflection outgoing mirror; 8 (15), monomode fiber Polarization Controller; 9, the polarization beam apparatus of optical fiber coupling; 12, completely reflecting mirror; 13, necessarily export ratio list polarization polarization maintaining optical fibre output coupler; 14, monomode fiber coupling isolator; 17, polarization maintaining optical fibre loop device; 18, polarization maintaining optical fibre coupling isolator.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment 1:
Present embodiment provides a kind of locked mode all risk insurance that is operated in Totally positive dispersion district, ambient stable to mix Yb partially
3+The structure of optical fiber linear laser cavity, adopt one section guarantor to mix the rare earth gain fibre partially as gain media, the logical type of band of suitable centre wavelength and bandwidth of having used in its chamber is protected the element of inclined to one side long period optical fiber grating filter as selection of mode-locked laser centre wavelength and spectral filtering pulse compression, realizes full fiber-optical ultrashort pulse laser stable mode-locking vibration.
Referring to accompanying drawing 1, it is the schematic diagram that present embodiment adopts the cavity body structure of linear cavity locked mode full polarization fibre laser; Utilized the logical type of band of suitable centre wavelength and bandwidth to protect the element of inclined to one side long period optical fiber grating filter and spectral filtering pulse compression tuning in the chamber as mode-locked laser centre wavelength.Pumping laser is coupled into by wavelength division multiplexer (WDM) and protects inclined to one side rare earth doped optical fibre generation gain, adopted the element of the logical type long period optical fiber grating filter of band of suitable centre wavelength and bandwidth in the laser chamber as the selection and the spectral filtering pulse compression of laser centre wavelength, polarization maintaining optical fibre output coupler output mode-locked laser power also guarantees to have only an optical axis direction laser generation, completely reflecting mirror is as the first cavity end face of laser cavity, one by optical system coupled or directly be bonded at semiconductor saturable absorber on the fiber end face as the second reflection cavity face and the locked mode components and parts of laser, and semiconductor saturable absorber is to the nonlinear interaction and the gain fibre of laser, suitably (the logical type of 4～12nm) band is protected inclined to one side long period fiber grating spectral filtering light pulse compression for centre wavelength (1.0～1.1 μ m) and bandwidth, produce stable locked mode ultra-short pulse laser at whole positive dispersion laser cavity.Can be seen that by Fig. 1 its concrete annexation is: pumping laser 5 is coupled into by wavelength division multiplexer (WDM) 4 and protects inclined to one side rare earth doped optical fibre 3 generation gains; Having adopted centre wavelength in the laser chamber is that 1.1 μ m, bandwidth are the element of the logical type long period optical fiber grating filter 1 of band of 6nm as the selection and the spectral filtering light pulse compression of laser centre wavelength; Polarization maintaining optical fibre output coupler 13 is connected with the suitable logical type long period optical fiber grating filter 1 of band of bandwidth, and polarization maintaining optical fibre output coupler 13 output mode-locked laser power also guarantee to have only the laser generation of slow-axis direction; Completely reflecting mirror 12 is as the first reflection end face of laser cavity; One by optical system coupled or directly be bonded at semiconductor saturable absorber 0 on the fiber end face as the second reflection cavity face and the locked mode components and parts of fiber laser, the logical type of the band of the nonlinear interaction of 0 pair of laser of semiconductor saturable absorber and gain fibre 3, suitable bandwidth is protected inclined to one side long period optical fiber grating filter light pulse compression 1 at the stable locked mode ultra-short pulse laser of whole positive dispersion laser cavity generation, by 13 outputs of polarization maintaining optical fibre output coupler.Whole optical fibre devices are stablized the locked mode work of ambient stable ground for protecting inclined to one side device to guarantee the endovenous laser polarization in the full-optical-fiber laser chamber.
Embodiment 2:
The structure that present embodiment provides a kind of locked mode dual wavelength all risk insurance that is operated in Totally positive dispersion district, ambient stable work to mix Yb3+ optical fiber linear laser cavity partially.Adopt one section guarantor to mix the rare earth gain fibre partially as gain media, used two suitable centre wavelengths (centre wavelength is that 1.0～1.1 μ m are adjustable), bandwidth in its chamber and be the logical type of band of 4～12nm and protected the element of inclined to one side long period optical fiber grating filter, utilized semiconductor saturable absorber to realize the locked mode vibration that the full fiber-optical ultrashort pulse laser of dual wavelength is stable as dual wavelength mode locked fiber laser centre wavelength selecting tuning and spectral filtering light pulse compression.
Fig. 2 is a kind of cavity body structure schematic diagram that adopts the semiconductor saturable absorber locked mode, is operated in the full optical fiber linear laser cavity of dual wavelength in Totally positive dispersion district of present embodiment; Utilized the logical type long period optical fiber grating filter of band of two suitable bandwidth and centre wavelength to select as mode-locked laser centre wavelength and the element of spectral filtering pulse compression in the chamber.Pumping laser is coupled into by wavelength division multiplexer (WDM) and protects inclined to one side rare earth doped optical fibre generation gain, polarization beam apparatus is as the dual-wavelength laser light-splitting device, two elements that the different logical type long period polarization-maintaining fiber grating of band of centre wavelength selects element and the light pulse of locked mode spectral filtering to compress as dual-wavelength laser in the laser cavity, semiconductor saturable absorber is as the double-wavelength short pulse fiber laser locked mode element, that be operated in the Totally positive dispersion district.Referring to accompanying drawing 2, the concrete annexation of this optical fiber laser structure is: the coupling mirror 6 of a partial reflectance is connected with the laser signal input optical fibre of protecting inclined to one side 980/1064 wavelength division multiplexer 4, and the function of coupling mirror 6 is second reflection end face of output mode-locked laser pulse and whole laser; Polarization maintaining optical fibre wavelength division multiplexer (WDM) 4 is connected with pumping laser 5, and pumping laser 5 is by in wavelength division multiplexer (WDM) the 4 coupled into optical fibres laser cavities; Protect the inclined to one side Y that mixes for one section
b 3+One end of gain fibre 3 is connected with the other end (signal laser and the public end of pumping laser) of protecting inclined to one side 980/1064 wavelength division multiplexer 4 to produce laser gain; Protect the inclined to one side Y that mixes
b 3+The other end of gain fibre 3 closes bundle one word end polarization maintaining optical fibre with polarization beam apparatus 2 and is connected, and the function of polarization beam apparatus 2 is to use the mode of polarization to separate from the space laser of two wavelength; The attenuator 11 of two polarization maintaining optical fibre couplings, an end of 12 is connected with two polarization direction coupled fibers of polarization beam apparatus 2 respectively, the function of attenuator 11,12 is to change the net gain of the loss of two wavelength arms of dual-wavelength optical-fiber laser with two wavelength lasers of balance; The attenuator 11 of polarization maintaining optical fibre coupling, (one of them centre wavelength is 1.02 μ m to 12 the other end with two different centre wavelengths respectively, another is 1.09 μ m), bandwidth is the logical type long period polarization-maintaining fiber grating 101 of band of 10nm, an end of 102 connects, the effect of the logical type long period polarization-maintaining fiber grating 101,102 of band is the selection of dual-wavelength laser centre wavelength and the light pulse compression of two wavelength mode-locked lasers; Two semiconductor saturable absorber 01,02 leads to type long period polarization-maintaining fiber gratings 101 with two bands respectively, 102 other end optical fiber is by coupling optical system or directly by the optical cement connection, semiconductor saturable absorber 01,02 is served as a cavity reflection element of locked mode element and laser cavity.Thereby polarization beam apparatus 2 is separately controlled (as locked mode etc.) with the laser of two wavelength respectively with the mode of polarization from the space, and the realization of two wavelength laser locked modes is to have adopted two semiconductor saturable absorber 01,02, the band of two different centre wavelengths leads to type long period polarization-maintaining fiber grating 101,102 select two different locked mode centre wavelengths and realize locked mode spectral filtering light pulse compression at the Totally positive dispersion laser cavity, realize stable dual wavelength locked mode ultra-short pulse laser pulse output.
Embodiment 3:
Present embodiment provides a kind of locked mode dual wavelength all risk insurance that is operated in Totally positive dispersion, ambient stable to mix Y partially
b 3+The structure of linear cavity fiber laser.Adopt the guarantor of two sections different lengths to mix the rare earth gain fibre partially as gain media, having used two suitable centre wavelengths (1.0～1.1 μ m), bandwidth in its chamber is the element of the logical type long period polarization-maintaining fiber grating filter of band of 4～12nm as dual wavelength mode locked fiber laser centre wavelength selecting tuning and spectral filtering light pulse compression, utilizes semiconductor saturable absorber to realize the full fiber-optical ultrashort pulse laser locked mode vibration of dual wavelength Totally positive dispersion cavity.
Fig. 3 is that a kind of employing semiconductor saturable absorber realizes locked mode in the present embodiment, is operated in the cavity body structure schematic diagram of the full optical fiber linear laser cavity of Totally positive dispersion district dual wavelength; (the logical type long period optical fiber grating filter of 4～12nm) band is as the element of mode-locked laser centre wavelength selecting tuning and spectral filtering light pulse compression to have utilized two suitable centre wavelengths (1.0～1.1 μ m) and bandwidth in the chamber.Referring to accompanying drawing 3, its concrete structure is: the coupling mirror 6 of a partial reflectance closes bundle one word end polarization maintaining optical fibre with polarization beam apparatus 2 and is connected, and the function of coupling mirror 6 is mode-locked laser output port and first laser cavity reflecting surface; Two polarization maintaining optical fibre 980/1064 wavelength division multiplexers 401,402 signal laser input optical fibre is connected with two polarization direction coupled fibers of polarization beam apparatus 2 respectively, and the function of polarization beam apparatus 2 is to use the mode of polarization to separate from the space laser of two wavelength; The 976nm pumping laser 51,52 of two optical fiber couplings is by in wavelength division multiplexer (WDM) 401, the 402 difference coupled into optical fibres laser cavities; The guarantor of two sections different lengths mixes Y partially
b 3+One end of gain fibre 301,302 is connected with two other ends (signal laser and the public end of pumping laser) of protecting inclined to one side 980/1064 wavelength division multiplexer 4 respectively, and pumping laser produces laser gain in gain fibre; Two sections guarantors mix Y partially
b 3+Gain fibre 301,302 the other end is respectively the logical type long period polarization-maintaining fiber grating 101 of band of 12nm with two different centre wavelengths (wavelength may be selected to be 1.02 and 1.08 μ m respectively), bandwidth, an end of 102 connects, the effect of the logical type long period polarization-maintaining fiber grating 101,102 of band is that dual-wavelength laser centre wavelength is selected and the spectral filtering light pulse of two wavelength mode-locked lasers is compressed; Two semiconductor saturable absorber 01,02 leads to type long period polarization-maintaining fiber gratings 101 with two bands respectively, 102 other end optical fiber passes through coupling optical system or directly connects by optical cement, semiconductor saturable absorber 01,02 is served as the cavity reflecting element of laser mode locking element and laser cavity.Thereby polarization beam apparatus 2 is separately controlled (as locked mode etc.) with the laser of two wavelength respectively with the mode of polarization from the space, and the realization of two wavelength laser locked modes is to have adopted two semiconductor saturable absorber 01,02, the logical type long period polarization-maintaining fiber grating 101 of the band of two different centre wavelengths, 12nm bandwidth, 102 select two different locked mode centre wavelengths and realize the pulse compression of locked mode spectral filtering at the Totally positive dispersion laser cavity, form stable dual wavelength locked mode ultrashort pulse output.
Embodiment 4:
Present embodiment provides a kind of locked mode that is operated in the Totally positive dispersion annular chamber to mix Y
b 3+The structure of fiber laser, adopt one section single mode to mix the rare earth gain fibre as gain media, (the logical type long period optical fiber grating filter of 4～12nm) band is realized full fiber-optical ultrashort pulse laser stable mode-locking vibration as the element that mode-locked laser centre wavelength is selected and the spectral filtering light pulse is compressed to have used suitable centre wavelength (1.0～1.1 μ m) and bandwidth in its chamber.
Referring to accompanying drawing 4, it is the full-optical-fiber laser cavity body structure schematic diagram that present embodiment adopts annular chamber nonlinear polarization rotation locked mode; Utilized the element of the logical type long period optical fiber grating filter of band of suitable centre wavelength and bandwidth in the chamber as selection of mode-locked laser centre wavelength and spectral filtering light pulse compression.Pumping laser is coupled into the single mode rare earth doped optical fibre by wavelength division multiplexer (WDM) and produces gain, adopted the element of the logical type long period band general character fiber grating filter of band of suitable bandwidth in the annular cavity laser chamber as the selection and the spectral filtering light pulse compression of laser centre wavelength, the isolator of an optical fiber coupling is guaranteed the unidirectional vibration of fiber laser, two optical fiber polarization controllers are adjusted the polarization direction of fiber laser endovenous laser, polarization beam apparatus is as the output coupler of mode-locked laser, gain fibre, the logical type long period optical fiber grating filter of band, isolator, two optical fiber polarization controllers, the nonlinear polarization rotation saturable absorber of the laser that polarization beam apparatus is formed produces stable mode locking pulse.Its concrete annexation is as seen from Figure 4: pumping laser 5 is coupled into single mode rare earth doped optical fibre 30 by wavelength division multiplexer (WDM) 40 and produces gain; a suitable centre wavelength is 1.02 μ m; bandwidth is that the logical type long period optical fiber grating filter 10 of the band of 12nm is connected with single mode rare earth doped optical fibre 30 by a section single-mould fiber 16; the logical type long period optical fiber grating filter 10 of band is as the element of the selection and the spectral filtering light pulse compression of laser centre wavelength; an optical fiber polarization controller 8 is connected with long period band general character fiber grating filter 10; the effect of optical fiber polarization controller 8 is to adjust the endovenous laser polarization state and produce saturable absorber with other device to produce mode-locked laser pulse; the polarization beam apparatus 9 of an optical fiber coupling is connected with optical fiber polarization controller 8 and constitutes exports the variable laser output mouth of ratio; the isolator 14 of an optical fiber coupling is connected with the polarization beam apparatus 9 of optical fiber coupling; the effect of isolator 14 is to guarantee the unidirectional vibration of circular cavity optic fibre laser; another optical fiber polarization controller 15 is connected with isolator 14; the effect of optical fiber polarization controller 15 is to adjust the polarization state of annular chamber inner laser and form the saturable absorber that passive mode locking produces ultrashort laser pulse with other device; optical fiber polarization controller 15; wavelength division multiplexer (WDM) 40; single mode rare earth doped optical fibre 30; one section single-mould fiber 16; suitably the band of centre wavelength and bandwidth leads to type long period optical fiber grating filter 10; optical fiber polarization controller 8; the polarization beam apparatus 9 of optical fiber coupling; isolator 14 constitutes a laser that utilizes nonlinear polarization rotation lock mould annular chamber; the logical type long period optical fiber grating filter 10 of band produces intracavity wavelengths and selects and spectral filtering light pulse compressions, two optical fiber polarization controllers 8 and 15; gain fibre 30; the logical type long period optical fiber grating filter 10 of band; the polarization beam apparatus 9 generation nonlinear polarization rotations of optical fiber coupling can be satisfied and be closed the absorber locked mode.
Embodiment 5:
Present embodiment provides a kind of locked mode that is operated in the Totally positive dispersion district to mix Y
b 3+The structure of full polarization fibre annular-type cavity laser, adopt one section guarantor to mix the rare earth gain fibre partially as gain media, utilize semiconductor saturable absorber to realize locked mode work, (the logical type long period polarization-maintaining fiber grating filter of 4～12nm) band is realized stable full fiber-optical ultrashort pulse laser locked mode vibration as the element of mode-locked laser centre wavelength selecting tuning and spectral filtering light pulse compression to have used suitable centre wavelength (1.0～1.1 μ m) and bandwidth in its chamber.
Referring to accompanying drawing 5, it is the described a kind of full polarization fibre laser annular housing structural representation that adopts the semiconductor saturable absorber locked mode of present embodiment; Utilized in the chamber suitable bandwidth (4～12nm) and the logical type long period polarization-maintaining fiber grating filter of the band of centre wavelength (1.0～1.1 μ m) as the element of mode-locked laser centre wavelength selecting tuning and spectral filtering light pulse compression.Pumping laser is coupled into to mix by wavelength division multiplexer (WDM) protects inclined to one side rare earth doped fiber generation gain, adopted the element of the logical type long period optical fiber grating filter of band of suitable bandwidth in the annular cavity laser chamber as the selection and the spectral filtering light pulse compression of laser centre wavelength, the isolator of a polarization maintaining optical fibre coupling is guaranteed the unidirectional belt vibration of fiber laser, a polarization-maintaining fiber coupler is the mode-locked laser output coupler, gain fibre, the logical type long period optical fiber grating filter of band, isolator, the belt cavity of the laser that fiber coupler and semiconductor saturable absorber are formed produces stable mode-locked laser pulse.Its concrete annexation is as seen from Figure 5: pumping laser 5 is coupled into by wavelength division multiplexer (WDM) 4 and protects inclined to one side rare earth doped optical fibre 3 and produce gain; Centre wavelength is that 1.06 μ m, bandwidth are that an end of the logical type long period polarization-maintaining fiber grating filter 1 of band of 8nm is connected with the other end of protecting inclined to one side rare earth doped fiber 3 that mixes, and band leads to the element that type long period optical fiber grating filter 1 compresses as the selection and the spectral filtering light pulse of mode locked fiber laser centre wavelength; One end optical fiber of a polarization fiber coupler 13 is connected with the other end optical fiber of the logical type long period polarization-maintaining fiber grating filter 1 of band, and the effect of polarization fiber coupler 13 is mode-locked lasers in the output cavity; The input optical fibre end of a belt device 17 of polarization maintaining optical fibre is connected with the other end optical fiber of polarization fiber coupler 13, semiconductor saturable absorber 0 is by the optical lens coupling or directly be adhesive in polarization maintaining optical fibre with optics and go in ring on the second end optical fiber of device 17, and the nonlinear interaction of 0 pair of laser of semiconductor saturable absorber forms stable mode-locked laser pulse; The output optical fibre end of the belt device 17 of polarization maintaining optical fibre is connected with the input of polarization maintaining optical fibre isolator 18, and the effect of polarization maintaining optical fibre isolator 18 is to make the doped fiber ring laser one-way only operation; The output optical fiber of polarization maintaining optical fibre isolator 18 is connected with the signal input part optical fiber of wavelength division multiplexer (WDM) 4, forms a complete loop laser chamber; The nonlinear interaction of 0 pair of laser of semiconductor saturable absorber and gain fibre 3, the suitably logical type long period polarization-maintaining fiber grating filter 1 light pulse compression of the band of bandwidth, thereby produce stable locked mode ultra-short pulse laser at whole positive dispersion laser cavity, by 13 outputs of polarization maintaining optical fibre output coupler.
Claims (1)
1. Totally positive dispersion cavity mode-locked all-fiber laser, it is the ultrashort pulse full polarization fiber ring-type cavity laser that is operated in the Totally positive dispersion district, it is characterized in that: described ring-like cavity laser comprises that a fiber end face is pasted with the polarization maintaining optical fibre loop device of semiconductor saturable absorber, polarization fiber isolator, optical-fiber laser gain media, the logical type long period optical fiber grating filter of band and output coupler; Described band leads to the type long period optical fiber grating filter, and its centre wavelength is that 1.0～1.1 μ m, bandwidth are 4～12nm; Described optical-fiber laser gain media adopts one section guarantor to mix the rare earth gain fibre partially as gain media; The structure of this laser is:
A pumping source [5] provides pump light for wavelength division multiplexer [4], as input pumping light;
A wavelength division multiplexer [4] is mixed rare earth gain fibre [3] partially and is connected the pumping laser [5] that is used for pumping source and is input to and protects inclined to one side rare earth doped fiber [3] generation laser gain with protecting;
One end of a logical type long period polarization-maintaining fiber grating [1] of band is connected with the other end of protecting inclined to one side gain fibre [3], and the logical type long period polarization-maintaining fiber grating [1] of band is realized stable mode-locking work to the selection and the pulse compression of locked mode spectrum of mode-locked laser pulse centre wavelength;
One is had only an end of the fiber coupler [13] of single polarization axle concussion output to be connected with the other end of the logical type long period fiber grating [1] of band, and mode-locked laser pulse is exported from fiber coupler [13];
The first end optical fiber of a polarization maintaining optical fibre loop device [17] is connected with the other end of fiber coupler [13];
The second end optical fiber of a polarization maintaining optical fibre loop device [17] and a semiconductor saturable absorber are by optical lens or directly be connected with optical cement, and semiconductor saturable absorber produces mode-locking effect to the nonlinear interaction of laser in annular cavity laser;
The 3rd end optical fiber of a polarization maintaining optical fibre loop device [17] is connected with the isolator [18] of a polarization maintaining optical fibre coupling, and isolator makes the unidirectional generation laser of doped fiber ring laser shake;
The output optical fiber of isolator [18] is connected with the other end optical fiber of wavelength division multiplexer [4], constitutes complete, a unidirectional loop laser chamber.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631143A (en) * | 2017-03-21 | 2018-10-09 | 中国移动通信有限公司研究院 | A kind of Semiconductor laser device and method |
| CN108631144A (en) * | 2017-03-21 | 2018-10-09 | 中国移动通信有限公司研究院 | A kind of Semiconductor laser device and method |
| CN109586148A (en) * | 2018-12-25 | 2019-04-05 | 武汉孚晟科技有限公司 | A kind of pulse optical fiber based on master oscillator power amplifier structure |
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| US20080151945A1 (en) * | 2006-06-27 | 2008-06-26 | Polaronyx, Inc. | Ultrashort stable mode locked fiber laser at one micron by using polarization maintaining (PM) fiber and photonic bandgap fiber (PBF) |
| CN101510663B (en) * | 2009-03-06 | 2011-07-20 | 苏州大学 | Polarization dual wavelength fiber-optical ultrashort pulse laser |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631143A (en) * | 2017-03-21 | 2018-10-09 | 中国移动通信有限公司研究院 | A kind of Semiconductor laser device and method |
| CN108631144A (en) * | 2017-03-21 | 2018-10-09 | 中国移动通信有限公司研究院 | A kind of Semiconductor laser device and method |
| CN108631144B (en) * | 2017-03-21 | 2019-09-13 | 中国移动通信有限公司研究院 | A kind of Semiconductor laser device and method |
| CN108631143B (en) * | 2017-03-21 | 2019-10-08 | 中国移动通信有限公司研究院 | A kind of Semiconductor laser device and method |
| CN109586148A (en) * | 2018-12-25 | 2019-04-05 | 武汉孚晟科技有限公司 | A kind of pulse optical fiber based on master oscillator power amplifier structure |
| CN109586148B (en) * | 2018-12-25 | 2024-04-30 | 武汉孚晟科技有限公司 | Pulse fiber laser based on main oscillation power amplifier structure |
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