CN108462023A - High-power optical fiber laser amplifier system with high mode instability threshold - Google Patents
High-power optical fiber laser amplifier system with high mode instability threshold Download PDFInfo
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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
- H01S3/06754—Fibre amplifiers
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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
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
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Abstract
The high-power optical fiber laser amplifier system with the high mode unstable threshold comprises a linear polarization main oscillator, a collimating lens group, a lambda/4 glass slide, a lambda/2 glass slide, a focusing lens group, a high-power main amplifier, a beam expanding and collimating system, a high-reflection mirror, a power receiver, a beam splitter, a photoelectric signal conversion display module and a light beam quality measuring instrument. By introducing the polarization regulation and control system into the high-power optical fiber laser amplifier, the high-order mode proportion of longitudinal injection and transmission along the gain optical fiber of the high-power optical fiber laser amplifier is reduced, and the mode instability effect in the high-power optical fiber laser amplifier can be inhibited. The system can effectively improve the mode unstable threshold caused by the nonlinear effect and the traditional transverse mode interference, and provides a reliable technical means for further power improvement and performance optimization of the high-power fiber laser.
Description
Technical field
The invention belongs to High-power Laser Technologies fields, more particularly to a kind of high-power light having the unstable threshold value of height mode
Fine laser amplifier system.
Background technology
Compared with other types laser, optical-fiber laser has high conversion efficiency, good beam quality, heat management convenience, knot
Structure is compact, easy to many advantages such as maintenance, has obtained the extensive concern of domestic and international more research units.From First light in 1964
Since fibre laser comes out, what optical-fiber laser had been achieved for attracting people's attention in the development course in past more than 50 years develops into
Just, application range has also been extended to many necks such as laser cutting, laser welding, material molding, laser drill, laser rock fragmenting
Domain.Under the promotion of many application fields, optical-fiber laser receives always as a kind of important technology scheme for realizing high power light source
The extensive favor of domestic and international researcher.From after optical-fiber laser in 1999 breaks through hectowatt for the first time, optical fiber laser output power is in mistake
It goes in the development course of recent two decades to show very tempting power ascension potentiality and development prospect.
However, being limited to the fuel factor of medium itself, high brightness pump technology, nonlinear effect, fiber end face damage, mould
Unstable effect of formula etc., single-path optical fiber laser power is promoted has faced severe technical bottleneck at present.
Result of study shows for fibre core at present<100 μm of gain fibre, unstable pattern is limitation optical-fiber laser brightness
The primary factor of promotion.The unstable physical image of pattern is as described below：With the increase of pump power, when optical fiber laser is defeated
Go out power more than after a certain threshold power, the high speed dynamic coupling between basic mode to higher order mode can occur for output zlasing mode
It closes, the frequency of coupling is in 2kHz or so；When output power is reduced to threshold power or less, the high speed Dynamic Coupling between pattern
It disappears.Since the unstable effect of pattern can make optical fiber laser output mode that serious degeneration occur, optical fiber can be caused to put
The output brightness of big device and beam quality generate abrupt degradation, eventually lead to the deterioration of optical fiber laser overall performance.
Up to now, although researcher has proposed bending loss, special fiber design, changed signal both at home and abroad at present
A variety of suppressing methods such as light/pump wavelength, the unstable effect of pattern are still current large-power optical fiber laser amplifier power
With the most important technical bottleneck of luminance raising.In addition, current research is the result shows that the nonlinear effects such as stimulated Raman scattering can be led
The unstable threshold value of cause pattern is substantially reduced.
Based on above-mentioned consideration, it is conceived to source and the precondition of the unstable generation of pattern, considers nonlinear effect as a whole
Inhibit, proposes that new departure suitable for the unstable inhibition of large-power optical fiber laser amplifier pattern is of great significance.
Invention content
In view of the defects existing in the prior art, the present invention is based on the Physical Mechanisms of the unstable generation of pattern and basic premise item
Part provides one kind and has in conjunction with the dependence between the nonlinear effects such as stimulated Raman scattering threshold property and polarization characteristic
The large-power optical fiber laser amplifier system of the unstable threshold value of height mode, effectively to be promoted due to nonlinear effect and traditional transverse mode
The unstable threshold value of pattern caused by interference provides reliably for further power ascension and the performance optimization of large-power optical fiber laser
Technological means.
To realize the above-mentioned technical purpose, the technical scheme is that：
The large-power optical fiber laser amplifier system for having the unstable threshold value of height mode, by being put in large-power optical fiber laser
Polarization regulator control system is introduced in big device, reduction is longitudinally injected along large-power optical fiber laser amplifier gain optical fiber and the high-order of transmission
Pattern ratio can inhibit the unstable effect of pattern in large-power optical fiber laser amplifier.The wherein described polarization regulator control system
It is the polarization regulator control system for the polarization regulation and control that linear polarization optical-fiber laser is realized using the slides of λ/4 and the slides of λ/2.
Specifically, the large-power optical fiber laser amplifier system for having the unstable threshold value of height mode includes linear polarization main oscillations
The slide of device, collimation lens set, λ/4, the slides of λ/2, focus lens group, high power main amplifier, beam-expanding collimation system, high reflective mirror,
Power receiver, beam splitter, photoelectric signal transformation display module, beam quality measuring instrument.
The linear polarization optical-fiber laser exported from linear polarization master oscillator is successively incident after collimation lens set collimation output
To the slides of λ/4 and the slides of λ/2.Laser beam line focus lens group after the slides of λ/4 and the slides of λ/2 is coupled into high power master and puts
Big device carries out power amplification.Freedom is output to by beam-expanding collimation system collimation through high power main amplifier amplified laser beam
Space.The light beam of collimation output is incident on high reflective mirror, and most light beams are reflected through high reflective mirror, this part reflected light is by work(
Rate receiver receives, and sub-fraction light beam is transmitted through high reflective mirror, this fractional transmission light is divided into two bundles by beam splitter, wherein passing through
The reflected light that beam splitter reflection goes out is incident on photoelectric signal transformation display module, and light is injected into through the transmitted light that beam splitter transmits
Beam quality measuring instrument.Photoelectric signal transformation display module converts optical signals to electric signal, and time domain and frequency-region signal are shown
In terminal, the threshold value occurred to the unstable effect of observing pattern.Beam quality measuring instrument is to the unstable effect of observing pattern
The beam quality that front and back large-power optical fiber laser system occurs changes and exports the beam quality measured value detected.
In the present invention：Realize that the polarization of linear polarization optical-fiber laser regulates and controls using the slides of λ/4 and the slides of λ/2；By rotating λ/4
The polarization state regulation of incident linear polarization optical-fiber laser can be desired inclined by the angle of its main shaft of slide and the slides of λ/2
It shakes distribution.
In the present invention：Further include linear polarization cascaded optical fiber preamplifier system, the linear polarization exported from linear polarization master oscillator
Optical-fiber laser was incident on linear polarization cascaded optical fiber preamplifier system and carries out power pre-amplification first, and the line after power pre-amplification is inclined
The laser light incident that shakes realizes collimation output to collimation lens set.If the laser power that linear polarization master oscillator generates passes through condenser lens
Group can meet the amplification needs of high power main amplifier, then linear polarization cascaded optical fiber preamplifier system can save.
In the present invention：
The linear polarization master oscillator realization method is unlimited, line width is unlimited, centre wavelength is unlimited, time domain specification is unlimited；From
Can be traditional fiber oscillator, superfluorescent fiber sources, random fiber laser etc. on realization method；From line width
Speech, can be narrow linewidth optical fiber source, wide-spectrum optical fiber light source；For centre wavelength, can be 1 micron waveband (1030nm~
1100nm), long wave band (1100nm~1150nm), the arbitrary wavelength within 2 micron wavebands.It, can be with for time domain specification
It is continuous laser or pulse laser.
Linear polarization cascaded optical fiber preamplifier system of the present invention realizes the pre-amplification of injection linear polarization optical-fiber laser.Line
The series for polarizing cascaded optical fiber preamplifier system is unlimited, can be single-stage linear polarization optical fiber prime amplifier, can also be multistage line
Polarization fiber prime amplifier.
The laser alignment that linear polarization cascaded optical fiber preamplifier system exports is output to by collimation lens set of the present invention
Free space；Collimation lens set is generally made of one or more optical lenses, and the focal length of optical lens is unlimited, with specific reference to line
It polarizes the core size of cascaded optical fiber preamplifier system output optical fibre and the spot size after collimation determines；The material of optical lens
It is unlimited, can be the optical crystal materials such as K9, fused quartz.
The slides of λ of the present invention/4 realize the pi/2 phase of two polarized orthogonal directions of incident laser (fast and slow axis of slide)
It moves, constituent material can there are many select (uniaxial optical crystal material, liquid crystal etc.)；
The slides of λ of the present invention/2 realize the π phase shifts of two polarized orthogonal directions of incident laser (fast and slow axis of slide),
Its constituent material can there are many select (uniaxial optical crystal material, liquid crystal etc.)；
Focus lens group of the present invention will focus on the input light of high power main amplifier by the laser of the slides of λ/2
In fibre；Focus lens group is generally made of one or more optical lenses, and the focal length of optical lens is unlimited, with specific reference to high power
The core size and launching spot size of main amplifier input optical fibre determine；The material of optical lens is unlimited, can be K9, molten stone
The optical crystal materials such as English.
High power main amplifier of the present invention realizes the final amplification of incident laser power, and main amplifier is by pumping
The part such as source, signal-pump combiner, doped fiber forms.The input optical fibre of main amplifier is generally signal-pump combiner
Signal arm, pumping source is coupled into doped fiber by the pumping arm of signal-pump combiner, and pumping doped fiber realizes big work(
Rate optical-fiber laser exports.
Beam-expanding collimation system of the present invention generally comprises end caps and collimator；End caps can complete laser beam
It expands, effectively reduces the laser power density of output end face, prevent optics electric discharge；Collimator is used for laser beam datum.
High reflective mirror of the present invention realizes the high reflection function of output laser, and reflectivity is unlimited, general to require>
99%；The constituent material of high reflective mirror is unlimited, can be fused quartz, K9, ZnSe, CaF2 etc..
Power receiver of the present invention is used to receive the main laser beam of high reflective mirror reflection, power receiver constituent material
It is unlimited, can be fused quartz material, silica-base material, copper cone etc..
Beam splitter realization method of the present invention is various, can be white tiles (reflectivity 4%), wedge-shaped mirrors, fixed beam splitting
The beam splitter etc. of ratio, the constituent material of beam splitter is unlimited, can be fused quartz, K9, ZnSe, CaF2 etc..
Photoelectric signal transformation display module of the present invention is generally made of photodetector and oscillograph, will be incident
Optical signal be converted to electric signal, and electric signal (time-domain signal and frequency-region signal of laser) is shown in exterior terminal, to
The threshold value that the unstable effect of observing pattern occurs.With the promotion of output power, when the unstable effect of pattern occurs, output swashs
The time-domain signal of light will appear apparent unstable and time domain and rise and fall, and the frequency-region signal for exporting laser can generate near 2kHz
Apparent characteristic frequency.
Beam quality measuring instrument of the present invention realizes the test and monitoring to quality for outputting laser beam, observing pattern
The beam quality variation of front and back large-power optical fiber laser system occurs for unstable effect.Meeting after occurring due to the unstable effect of pattern
The Dynamic Coupling between basic mode and higher order mode is generated, therefore the degeneration of beam quality will certainly be caused.In addition, by combining light
The beam quality that electric signal converts time-domain signal, frequency-region signal and beam quality the measuring instrument detection of display module output measures
Value, the rotation angle that the slide slides of 2-4 and λ/2 of λ/4 2-5 can be selected best complete system optimization.
The principle that the unstable effect of implementation pattern of the present invention inhibits is as described below：
Since large mode field double clad gain fibre itself has the ability for supporting multiple eigen modes, large mode field double clad increases
Basic mode and a small amount of higher order mode are inevitably existed simultaneously in beneficial fiber core.Different transverse modes (i.e. basic mode and higher order mode)
Between can interfere, in gain fibre fibre core formed nonuniform illumination distribution.In turn, due to longitudinally pumped along gain fibre
Luminous power extractability is different and there are Excited states, and gain fibre longitudinal direction different location is caused to generate different heat distributions,
Form temperature gradient.Temperature gradient generates index disturbance under the action of thermo-optic effect, and long period refraction is formed in fibre core
Rate grating, influences interference optical field, ultimately forms intercoupling and closing between interference optical field, temperature field and index disturbance field
Ring generates the unstable effect of pattern.
The Physical Mechanism generated by the unstable effect of above-mentioned pattern can obtain, and interfering between basic mode and higher order mode is
The basic premise condition of the unstable generation of pattern.If higher order mode is not present in fiber amplifier, the unstable effect of pattern is not
It can occur.The higher order mode injected in fiber amplifier is fewer, and the interaction between basic mode and higher order mode is weaker, and pattern is not
The threshold value that stabilizing effect occurs is higher.Therefore, can effectively be pressed down by controlling the ratio of higher order mode in injection fibre amplifier
The unstable effect of molding formula.
In multimode fiber amplifier, since polarization direction has differences between different eigen modes, each pattern superposition
There are internal association between polarisation distribution and amplifier overall output pattern afterwards, and amplifier itself is there are principal state of polarization (psp),
Therefore the polarization direction by adjusting injection main amplifier laser can realize the regulation and control to injection way.
Based on above-mentioned consideration injection can be effectively controlled by introducing polarization regulation and control in large-power optical fiber laser amplifier
The ratio of higher order mode in amplifier, effective inhibition of the unstable effect of implementation pattern.In addition, with the power of fiber amplifier
It is promoted, will produce the nonlinear effects such as stimulated Raman scattering in amplifier.The nonlinear effects such as stimulated Raman scattering can effectively drop
The unstable threshold value of low mode.In large-power optical fiber laser amplifier, the nonlinear effects such as stimulated Raman scattering threshold value with put
The polarization direction of laser is closely related in big device.When inject the polarization direction in main amplifier be circular polarization state when, it is non-linear by
Swash the threshold value highest of Raman scattering effect.It is non-linear to be excited to draw when it is linear polarization to inject the polarization direction in main amplifier
The threshold value of graceful scattering effect is minimum.Therefore by large-power optical fiber laser amplifier introduce polarization regulation and control can effectively inhibit by
Swash the nonlinear effects such as Raman scattering, and then the generation threshold value of the unstable effect of Lifting scheme.
In conclusion by introducing polarization Regulation Mechanism in large-power optical fiber laser amplifier, reduce along gain fibre
Longitudinal higher order mode ratio injected and transmit, and then the nonlinear effects threshold values such as system stimulated Raman scattering are reduced, it can be effective
Inhibit the unstable effect of pattern in large-power optical fiber laser amplifier.
Compared with prior art, the present invention can generate following technique effect：
1, the present invention is based on the unstable effects of pattern to result from the Physical Mechanism to intercouple between basic mode and higher order mode
With precondition, in conjunction with the interdependence and nonlinear effects and the polarization characteristic such as stimulated Raman scattering between polarization and pattern
Between dependence, by large-power optical fiber laser amplifier introduce polarization Regulation Mechanism reduce along main amplifier gain
The higher order mode ratio that optical fiber longitudinally transmits promotes the nonlinear effects threshold values such as stimulated Raman scattering, is finally reached suppression mode
Unstable purpose.
2, compared with traditional suppressing method, the present invention can effectively inhibit when large-power optical fiber laser amplifier is with power
When promoting the nonlinear effects such as generation stimulated Raman scattering, pattern is unstable caused by the nonlinear effects such as stimulated Raman scattering.
3, the present invention has versatility：Can apply wave-length coverage for, this method can be used for 1 mu m waveband (1030nm~
1100nm), long wave band (1100nm~1150nm), the arbitrary wavelength within 2 mu m wavebands；From can using laser temporal characteristic and
Speech, can be continuous laser or nanosecond, picosecond, the different pulse lasers such as femtosecond.
4, linear polarization master oscillator realization method of the invention is unlimited, can be traditional fiber oscillator, superfluorescent fiber
Light source, random fiber laser etc.；Linear polarization master oscillator line width is unlimited, can be narrow linewidth optical fiber source or wide range optical fiber light
Source.
5, the devices realization method such as power receiver, beam splitter used in the present invention is various, and the slide of lens, λ/4, λ/
The device materials such as 2 slides, high reflective mirror are chosen various.
Description of the drawings
Fig. 1 is the system structure principle schematic of the present invention.
Figure includes：
The slide 1- of linear polarization master oscillator 1-1, linear polarization cascaded optical fiber preamplifier system 1-2, collimation lens set 1-3, λ/4
4, the slides of λ/2 1-5, focus lens group 1-6, high power main amplifier 1-7, beam-expanding collimation system 1-8, high reflective mirror 1-9, power connect
Receive device 1-10, beam splitter 1-11, photoelectric signal transformation display module 1-12, beam quality measuring instrument 1-13.
Specific implementation mode
Fig. 1 is the structural schematic diagram of a specific embodiment of the invention, has the large-power optical fiber of the unstable threshold value of height mode
Laser amplifier system includes：Linear polarization master oscillator 1-1, linear polarization cascaded optical fiber preamplifier system 1-2, collimation lens set 1-
3, the slides of λ/4 slide of 1-4, λ/2 1-5, focus lens group 1-6, high power main amplifier 1-7, beam-expanding collimation system 1-8, height are anti-
Mirror 1-9, power receiver 1-10, beam splitter 1-11, photoelectric signal transformation display module 1-12, beam quality measuring instrument 1-13.
The laser exported from linear polarization master oscillator 1-1 first passes around linear polarization cascaded optical fiber preamplifier system 1-2 and carries out
Power pre-amplification.The series of linear polarization cascaded optical fiber preamplifier system 1-2 is unlimited, can be single-stage linear polarization optical fiber pre-amplification
Device can also be multistage linear polarization optical fiber prime amplifier.Line after linear polarization cascaded optical fiber preamplifier system 1-2 pre-amplifications is inclined
The laser that shakes is incident on the slides of λ/4 1-4 after collimation lens set 1-3.The light beam exported from the slides of λ/4 1-4 is injected into the slides of λ/2
1-5.It, can be by the polarization state regulation of incident linearly polarized laser by rotating the angle of the slide slide 1-5 main shafts of 1-4 and λ/2 of λ/4
It is distributed for random polarization.Laser beam line focus lens group 1-6 couplings after the 1-5 polarization regulation and control of the slide slides of 1-4 and λ/2 of λ/4
It closes into high power main amplifier 1-7 and carries out final power amplification.If the laser power that linear polarization master oscillator 1-1 is generated is by poly-
Focus lens group 1-6 can meet the amplification needs of high power main amplifier 1-7, then linear polarization cascaded optical fiber preamplifier system 1-
2 can save.Free sky is output to by beam-expanding collimation system 1-8 collimations through the amplified laser of high power main amplifier 1-7
Between.The light beam of output is collimated after high reflective mirror 1-9, most reflected lights are received by power receiver 1-10, sub-fraction
Transmitted light is divided into two bundles by beam splitter 1-11.Reflected light after beam splitter 1-11 is incident on photoelectric signal transformation display module 1-
12.Photoelectric signal transformation display module 1-12 is generally made of photodetector and oscillograph.Photoelectric signal transformation display module
1-12 converts optical signals to electric signal, and by time domain and frequency-region signal include in outlet terminal, it is unstable to observing pattern
The threshold value of generation.With the promotion of output power, when the unstable generation of pattern, the time-domain signal for exporting laser will appear obviously
Unstable and time domain rise and fall, and the frequency-region signal for exporting laser can generate apparent characteristic frequency near 2kHz.Through beam splitting
Transmitted light after device 1-11 is injected into beam quality measuring instrument 1-13, to large-power optical fiber before and after the unstable generation of observing pattern
The beam quality of laser system changes.Due to will produce the dynamic coupling between basic mode and higher order mode after the unstable generation of pattern
It closes, therefore the degeneration of beam quality will certainly be caused.In addition, by combine photoelectric signal transformation display module 1-12 output when
The beam quality measured value of domain signal, frequency-region signal and the 1-13 detections of beam quality measuring instrument, can select the slides of λ/4 1-4
The best rotation angle with the slides of λ/2 1-5 completes system optimization.
The foregoing is merely a preferred embodiment of the present invention, are not intended to restrict the invention, for this field
For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. having the large-power optical fiber laser amplifier system of the unstable threshold value of height mode, it is characterised in that：By high-power
Polarization regulator control system is introduced in optical fiber laser amplifier, reduce along large-power optical fiber laser amplifier gain optical fiber longitudinally injection and
The higher order mode ratio of transmission can inhibit the unstable effect of pattern in large-power optical fiber laser amplifier, wherein described inclined
The regulator control system that shakes is the polarization regulator control system for the polarization regulation and control that linear polarization optical-fiber laser is realized using the slides of λ/4 and the slides of λ/2.
2. the large-power optical fiber laser amplifier system according to claim 1 for having the unstable threshold value of height mode, special
Sign is：System includes linear polarization master oscillator, collimation lens set, the slides of λ/4, the slides of λ/2, focus lens group, high power master
Amplifier, beam-expanding collimation system, high reflective mirror, power receiver, beam splitter, photoelectric signal transformation display module, beam quality are surveyed
Measure instrument；
The linear polarization optical-fiber laser exported from linear polarization master oscillator is successively incident on λ/4 after collimation lens set collimation output
Slide and the slides of λ/2；Laser beam line focus lens group after the slides of λ/4 and the slides of λ/2 is coupled into high power main amplifier
Carry out power amplification；Free sky is output to by beam-expanding collimation system collimation through the amplified laser beam of high power main amplifier
Between；The light beam of collimation output is incident on high reflective mirror, and most light beams are reflected through high reflective mirror, this part reflected light is by power
Receiver receives；Sub-fraction light beam is transmitted through high reflective mirror, this fractional transmission light is divided into two bundles by beam splitter, wherein through dividing
The reflected light that beam device reflects is incident on photoelectric signal transformation display module, and light beam is injected into through the transmitted light that beam splitter transmits
Mass measurer.
3. the large-power optical fiber laser amplifier system according to claim 2 for having the unstable threshold value of height mode, special
Sign is：It, can be by the inclined of incident linear polarization optical-fiber laser by rotating the angle of its main shaft of the slides of λ/4 and the slides of λ/2
Polarization state is regulated to desired polarisation distribution.
4. the large-power optical fiber laser amplifier system according to claim 2 or 3 for having the unstable threshold value of height mode,
It is characterized in that：Further include linear polarization cascaded optical fiber preamplifier system, the linear polarization optical-fiber laser exported from linear polarization master oscillator
It was incident on linear polarization cascaded optical fiber preamplifier system first and carries out power pre-amplification, the linearly polarized laser after power pre-amplification enters
It is mapped to collimation lens set and realizes collimation output.
5. the large-power optical fiber laser amplifier system according to claim 4 for having the unstable threshold value of height mode, special
Sign is：Photoelectric signal transformation display module converts optical signals to electric signal, and by time domain and frequency-region signal include in terminal,
The threshold value occurred to the unstable effect of observing pattern；It is defeated when the unstable effect of pattern occurs with the promotion of output power
The time-domain signal for going out laser will appear apparent unstable and time domain fluctuating, and the frequency-region signal for exporting laser can be near 2kHz
Generate apparent characteristic frequency.
6. the large-power optical fiber laser amplifier system according to claim 5 for having the unstable threshold value of height mode, special
Sign is：The light beam matter of front and back large-power optical fiber laser system occurs to the unstable effect of observing pattern for beam quality measuring instrument
Amount changes and exports the beam quality measured value detected, by combining the time domain of photoelectric signal transformation display module output to believe
Number, frequency-region signal and beam quality measuring instrument detection beam quality measured value, the slide slides of 2-4 and λ/2 of λ/4 can be selected
Rotation angle best 2-5 completes system optimization.
7. the large-power optical fiber laser amplifier system according to claim 2 for having the unstable threshold value of height mode, special
Sign is：Linear polarization master oscillator is fiber oscillator device, superfluorescent fiber sources or random fiber laser；
The centre wavelength of linear polarization master oscillator is the long wave of 1 micron waveband of 1030nm~1100nm, 1100nm~1150nm
Any wavelength in wave band or 2 micron wavebands.
8. the large-power optical fiber laser amplifier system according to claim 2 for having the unstable threshold value of height mode, special
Sign is：Linear polarization cascaded optical fiber preamplifier system is that single-stage linear polarization optical fiber prime amplifier or multistage linear polarization predispersed fiber are put
Big device.
9. the large-power optical fiber laser amplifier system according to claim 2 for having the unstable threshold value of height mode, special
Sign is：The slides of λ/4 realize the pi/2 phase shift in two polarized orthogonal directions of incident laser；The slides of λ/2 realize incident laser two partially
It shakes the π phase shifts of orthogonal direction.
10. the large-power optical fiber laser amplifier system for having the unstable threshold value of height mode according to claim 7,8 or 9
System, it is characterised in that：The reflectivity of high reflective mirror>99%, the material of high reflective mirror is fused quartz, K9, ZnSe or CaF2.
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