CN107689541A - Defocusing compensation type high-power narrow-linewidth linearly polarized optical fiber laser generation system - Google Patents
Defocusing compensation type high-power narrow-linewidth linearly polarized optical fiber laser generation system Download PDFInfo
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- CN107689541A CN107689541A CN201711011452.XA CN201711011452A CN107689541A CN 107689541 A CN107689541 A CN 107689541A CN 201711011452 A CN201711011452 A CN 201711011452A CN 107689541 A CN107689541 A CN 107689541A
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- expanding collimation
- optical fiber
- compensation type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
A defocusing compensation type high-power narrow-linewidth linearly polarized optical fiber laser generation system comprises a narrow-linewidth linearly polarized optical fiber seed source, a polarization control module, a non-polarization-preserving cascade optical fiber amplifier, a defocusing compensation type beam expanding collimation system, an integrated polarization and optical signal extraction module and an active polarization control system. Laser output from the narrow-linewidth linearly polarized optical fiber seed source is injected into the non-polarization-preserving cascade optical fiber amplifier after passing through the polarization control module, and the amplified laser is injected into the integrated polarization and optical signal extraction module after passing through the defocusing compensation type beam expanding collimation system. The integrated polarization and optical signal extraction module converts the extracted optical signal into an electric signal and injects the electric signal into the active polarization control system. The active polarization control system processes the electric signals and applies the control signals to the polarization control module to realize the closed-loop control of the whole system. The system can simultaneously realize the output of high-power narrow linewidth, linear polarization and low aberration optical fiber laser.
Description
Technical field
The invention belongs to High-power Laser Technologies field, more particularly to a kind of defocusing compensation type high-power narrow line width, linear polarization
Optical-fiber laser generation system.
Background technology
High-power narrow line width, linear polarization optical-fiber laser are in optics coherence tomography, Spectral beam combining, nonlinear frequency transformation, earth section
Many application fields such as, atomic and molecular physicses have a wide range of applications demand.
Generally, high-power narrow line width, linear polarization optical fiber laser straight connect is realized using the inclined cascade amplifier of seed servo all risk insurance.
In the inclined Cascaded amplification link of all risk insurance, because stimulated Brillouin scattering ratio of gains non PM fiber is high in polarization maintaining optical fibre, therefore, by
Brillouin scattering effect is swashed as it is limited to one of main limited resource of high power development.
It is in addition, existing test result indicates that the unstable threshold value of pattern is put significantly lower than the non-polarization-maintaining of same type in polarization-maintaining amplifier
Big device.The dual restriction of stimulated Brillouin scattering and the unstable effect of pattern seriously limits high-power narrow line width, linearly polarized light
The development of fine laser.
In order to overcome above-mentioned technical bottleneck, domestic and international researcher proposes active polarization control technology, that is, utilizes non-guarantor
Inclined amplifier carries out power ascension, and then non-polarization-maintaining amplifier degree of polarization is carried out using Polarization Controller and Algorithm of Active Control
Optimization, realize high-power narrow line width, the output of linear polarization optical-fiber laser.However, traditional big work(based on active polarization control technology
Its polarization of rate narrow linewidth, linear polarization optical-fiber laser is complicated with optical signal extraction module, and integrated level is not high, pole be unfavorable for its
The application in the fields such as optics coherence tomography, Spectral beam combining.In addition, when high-power narrow line width, linear polarization optical-fiber laser be used for optics coherence tomography,
During the fields such as Spectral beam combining, high power density irradiation lower beam-expanding collimation system, synthin etc. can produce it is different degrees of from
Burnt aberration.Defocus aberration can decline to laser beam quality after causing synthesis system combined coefficient to reduce, synthesizing.In non-linear frequency
Rate converts field, and defocus aberration equally can produce material impact to nonlinear frequency transformation efficiency.
Based on above-mentioned consideration, it is badly in need of introducing defocus aberration in high-power narrow line width, the design of linearly polarized light fiber laser system
Compensation technique.In general, a kind of compact type large power narrow linewidth with defocusing compensation function, linear polarization optical-fiber laser are designed
System has urgent realistic meaning.
The content of the invention
Present invention aims at providing a kind of defocusing compensation type high-power narrow line width, linear polarization optical fiber laser generation system,
The system can realize high-power narrow line width, linear polarization, the output of low aberrations optical-fiber laser simultaneously, be optics coherence tomography, Spectral beam combining, non-
The fields such as linear frequency conversion provide dependable performance, compact-sized high-performance optical fiber light source design scheme, promote high-power narrow
The overall performance lifting and the further development of application field of line width, linear polarization optical-fiber laser.
To realize the purpose of the present invention, it is achieved using following technical scheme：
A kind of defocusing compensation type high-power narrow line width, linear polarization optical fiber laser generation system, including narrow linewidth linearly polarized light
Fine seed source, Polarization Control Module, non-polarization-maintaining Cascaded Optical Amplifier Transmission Systems, defocusing compensation type beam-expanding collimation system, integration polarization
With optical signal extraction module and active polarization control system.
Pass through Polarization Control Module, non-polarization-maintaining cascaded optical fiber successively from the laser of narrow linewidth linear polarization optical fiber seed source output
Enter integration polarization and optical signal extraction module, integration polarization and light after amplifier, defocusing compensation type beam-expanding collimation system
Signal extraction module include polarization beam apparatus, high reflective mirror, taper give up light collector, attenuation factor and photoelectric detection module, through from
The laser beam of burnt offset-type beam-expanding collimation system collimation output is incided on polarization beam apparatus, is swashed incidence by polarization beam apparatus
Light light beam is divided into s light beams and p-polarization light beam two-way light beam, and p-polarization light beam is output to free space as main laser, and s is inclined
The light beam that shakes incides high reflective mirror, and for s light beams after high reflective mirror, most of s light beams reflex to the useless light of taper by high reflective mirror
Collector and collected by the taper light collector that gives up, sub-fraction s light beams are transmitted to attenuation factor from high reflective mirror；It is through decay
Laser beam after system decay is injected into photoelectric detection module；Photoelectric detection module will incide the laser light of photoelectric detection module
The optical signal of beam is converted to electric signal, and the electric signal after conversion is conveyed into active polarization control system；Active polarization controls
The electric signal that system is fed back to photoelectric detection module is handled, and obtains polarization control signal, and polarization control signal is applied
To Polarization Control Module, the closed-loop control of whole system is realized.Wherein：From the laser of narrow linewidth linear polarization optical fiber seed source output
It is injected into non-polarization-maintaining Cascaded Optical Amplifier Transmission Systems and is amplified after Polarization Control Module carries out polarization conversion, swashing after amplification
Light light beam incides defocusing compensation type beam-expanding collimation system, passes through the beam-expanding collimation lens in defocusing compensation type beam-expanding collimation system
It is collimated and aberration correction.
In the present invention：Defocusing compensation type beam-expanding collimation system includes two beam-expanding collimation modules, incides defocusing compensation type
The laser beam of beam-expanding collimation system carries out preliminary standard by the beam-expanding collimation lens in first beam-expanding collimation module to it first
Directly, the laser beam after preliminary collimation carries out secondary collimation by the beam-expanding collimation lens in second beam-expanding collimation module to it
Exported with after aberration correction.Wherein：It is saturating that beam-expanding collimation module includes tubular inner casing, cylindrical outer casing, heat conducting module and beam-expanding collimation
Mirror, the beam-expanding collimation lens are vertically installed in inner casing, and the inner casing is set in shell, is provided between inner casing and shell
For exporting the heat conducting module of used heat caused by beam-expanding collimation module；Two beam-expanding collimation modules are by rotating external member horizontal connection
Together, rotate outer casing screw of the both ends of external member respectively with two beam-expanding collimation modules to be connected, rotary sleeve is adjusted by rotating
Part, the spacing between two beam-expanding collimation lens can be adjusted.The heat conducting module includes inlet opening, apopore and water cooling tube
Road, the water cooling pipeline that outside cold water is entered in heat conducting module through inlet opening, after carrying out Forced water cooling to beam-expanding collimation module
Flowed out through apopore.The present invention adjusts rotation external member by rotating, and can adjust the spacing between two beam-expanding collimation lens, real
Defocusing compensation under existing high power.In order to realize high accuracy, a wide range of defocusing compensation, need to be rotated by careful design in external member
Flight pitch and screw thread scope ensure to rotate the degree of regulation and adjustable range of external member.Heat conducting module is used to export and expanded in the present invention
Used heat caused by beam collimating module, prevents heat accumulation, and fire damage is caused to devices such as lens.Heat conducting module is embedded in each expansion
Between the inside and outside shell of beam collimating module.Heat conducting module is internally provided with water cooling pipeline, and water cooling pipeline includes inlet pipeline and water outlet
Pipeline.Heat conducting module material can be the Heat Conduction Materials such as aluminium alloy, copper.When optical-fiber laser operates in it is high-power when, inlet opening and
Apopore will be connected with extraneous water-cooling system, and Forced water cooling is carried out to defocusing compensation type beam-expanding collimation system.
Two beam-expanding collimation modules are set to the first beam-expanding collimation module and the second beam-expanding collimation module in the present invention,
Inner casing in first beam-expanding collimation module is extend between the inner casing and shell of the second beam-expanding collimation module, the second beam-expanding collimation mould
The outer side of block is provided with a locking jackscrew, and locking jackscrew is extend on the inside of shell through the perforation on shell on the outside of shell
The inner casing of first beam-expanding collimation module is stretched into position locking, offers and locks on the inner casing of the first beam-expanding collimation module
Determine the lock hole of jackscrew cooperation, locking jackscrew inserts corresponding lock hole and realizes locking.Further.Locking jackscrew can also be according to
It is secondary through rotation external member, the second beam-expanding collimation module shell after insert corresponding lock hole on the first beam-expanding collimation module inner casing
Interior to realize locking, optimal location can be fixed on by rotation external member by so locking jackscrew.In rotation external member, the first beam-expanding collimation mould
Multiple lock holes interspersed for locking jackscrew are offered on block inner casing or/and the shell of the second beam-expanding collimation module, are easy to basis
The position of actual conditions adjustment locking jackscrew locking.In real application systems, after defocusing compensation effect reaches target,
Can it be realized by adjusting the relative position between locking jackscrew the first beam-expanding collimation module of locking and the second beam-expanding collimation module
The locking of spacing between two beam-expanding collimation lens.
Integration polarization and the optical signal extraction module of the present invention is set on a spinstand, and turntable can realize integration
Polarize with 360 degree of optical signal extraction module it is rotatable.Further, the turntable also includes fixture, and fixture can
Realize the locking of position between turntable and the second beam-expanding collimation module.Fixture on turntable is also a locking jackscrew.
The inner casing of second beam-expanding collimation module stretches to turntable, can pass through lock between the inner casing and turntable of the second beam-expanding collimation module
Determine jackscrew locking connection.Jackscrew is locked by adjusting, integration polarization and optical signal extraction module and defocusing compensation can be realized
Position locking between type beam-expanding collimation system.In practical operation, when regulation turntable causes system to export main laser power
When reaching maximum, turntable can be locked by fixture.
In integration polarization and optical signal extraction module, in order to reduce the thermal distoftion of system, integration polarization and optical signal
Polarization beam apparatus and high reflective mirror in extraction module are respectively assembled in water cooled refrigeration external member.Integration polarization carries with optical signal
Modulus block is provided with water cooling pipeline, and water cooling pipeline is coated on integration polarization and the outside of optical signal extraction module, polarization beam splitting
The water cooled refrigeration external member of device and high reflective mirror mutually joins with integrated polarization with the water cooling pipeline on optical signal extraction module respectively
Logical, integration polarization is provided with the inlet opening being connected with extraneous water-cooling system and water outlet with the water cooling pipeline of optical signal extraction module
Hole, the cold water in extraneous water-cooling system are inclined in water cooled refrigeration external member to being arranged on respectively after inlet opening enters water cooling pipeline
Shake beam splitter and high reflective mirror carries out Forced water cooling.When operating in high-power, inlet opening and apopore will connect with extraneous water-cooling system
Connect, Forced water cooling is carried out with optical signal extraction module to integration polarization, it is ensured that stable system performance.
Heretofore described narrow linewidth linear polarization optical fiber seed source implementation is unlimited, can be single-frequency linear polarization optical fiber kind
Narrow-linewidth laser source, directly narrow line caused by vibration chamber caused by component, the phase modulated method of single-frequency linear polarization optical fiber seed
Narrow linewidth linear polarization optical fiber seed source, Random Laser filtering production caused by the wide line polarization fiber seed source, super-fluorescence light source filtering
Raw narrow linewidth linear polarization optical fiber laser seed source etc..The centre wavelength of narrow linewidth linear polarization optical fiber seed source is unlimited, can be 1
Micron waveband (1030nm~1100nm), long wave band (1100nm~1150nm), any wavelength within 2 micron wavebands.It is narrow
Line width linear polarization optical fiber seed source time domain specification is unlimited, can be continuous laser or pulse laser.
Heretofore described Polarization Control Module is that can be converted to input polarization light it is expected to polarize the automatically controlled of light output
Polarization Control device, its type is unlimited, can be orientation angle-style Polarization Control Module, retardation type Polarization Control Module, orientation
Angle-retardation type Polarization Control Module etc., its response wave length, control accuracy, response speed are true according to actual control system parameter
It is fixed.
Seed power is passed through multistage non PM fiber amplifier by heretofore described non-polarization-maintaining Cascaded Optical Amplifier Transmission Systems
Expected level is brought up to, its number of stages of amplification determines that gain fibre Doped ions are true according to seed wavelength according to power output is horizontal
It is fixed.Optical fiber parameter, pumping configuration can have multiple choices according to amplifying power level.
Heretofore described defocusing compensation type beam-expanding collimation system is by two beam-expanding collimation module compositions, each beam-expanding collimation
Module includes a beam-expanding collimation lens, and the focal length of two beam-expanding collimation lens is true according to the size for expanding rear hot spot and aberration
It is fixed.The material selection of lens is various, can be fused silica, ZnSe, CaF2 etc., anti-reflection film plated film mode selects various, Ke Yishi
Individual layer plated film or multilayer plating.
In the present invention, polarization beam apparatus is set on a spinstand.By adjusting turntable, it can select and incide polarization
Optimal incident angle in fact on beam splitter, realize the pure linearly polarized laser output of peak power.Polarization beam apparatus is by defocusing compensation type
The light beam of beam-expanding collimation system injection is divided into two beams, and its implementation is various, can be polarization beam splitter, Glan prism, Bu Lu
This special window etc..Described polarization beam apparatus material is unlimited, can be the differences such as quartz, K9, Yttrium Orthovanadate, calcite, barium metaborate
Crystalline material.
In the present invention, integration polarization is used to change light path with the high reflective mirror in optical signal extraction module, its constituent material
It is unlimited, multiple choices can be had according to output laser power density.Reflected wavelength range is by narrow linewidth linear polarization optical fiber seed source
Cardiac wave length determines.Taper gives up light collector for collecting remaining useless light after Polarization Control, and attenuation factor is for saturating to high reflective mirror
The laser intensity penetrated is decayed, and prevents photoelectric detection module from saturation occurs.Photoelectric detection module converts optical signals to telecommunications
Number, its response wave length is determined by narrow linewidth linear polarization optical fiber seed source centre wavelength.Fixture is used for integration polarization to be believed with light
Fixation number between extraction module and defocusing compensation type beam-expanding collimation system.
The telecommunications that active polarization control system detects to integration polarization with photoelectric detection module in optical signal extraction module
Number algorithm process is carried out, obtain polarization control signal, and then be applied to Polarization Control Module, realize the closed loop control of whole system
System.Active polarization control system algorithm implementation is various, can be random paralleling gradient descent algorithm, climbing method etc..
Non- polarization-maintaining is injected into after first passing around Polarization Control Module from the laser of narrow linewidth linear polarization optical fiber seed source output
It is amplified in Cascaded Optical Amplifier Transmission Systems.Laser after amplification is injected into integrated inclined by defocusing compensation type beam-expanding collimation system
Shake and optical signal extraction module.Defocusing compensation type beam-expanding collimation system is based on double lens combination and realizes beam collimation.Double lens it
Between distance be designed as can adjust, realize defocus aberration compensation.Integration polarization with optical signal extraction module realize light beam be polarized,
The functions such as useless light is collected, optical signal extraction.By polarization and optical signal extraction module, main laser is directly output to free space,
The optical signal extracted is converted to electric signal, is injected into active polarization control system.Active polarization control system is entered to electric signal
Row algorithm process, applies control signals to Polarization Control Module, realizes the closed-loop control of whole system.Relative to existing skill
Art, present invention produces following advantageous effects：
1st, the present invention can realize high-power narrow line width, linear polarization, the output of low aberrations optical-fiber laser simultaneously.
2nd, the present invention is by designing defocusing compensation type beam-expanding collimation system, between being realized based on rotation external member between doublet
Away from it is high-precision, a wide range of adjustable, and then the defocus aberration of optical-fiber laser under high power is compensated.
3rd, the invention provides integration polarization with optical signal extraction module, using cramped construction can realize beam sampling,
The functions such as useless light processing, photoelectric signal transformation.
4th, the present invention possesses versatility：For time domain specification, the system can be used for jointed fiber laser or nanosecond, skin
Second, femtosecond isopulse optical-fiber laser；For frequency domain characteristic, the system is divided available for 1 micron, long wave, the different-wavebands such as 2 microns
The laser of cloth.
5th, in the present invention, narrow linewidth linear polarization optical fiber seed source implementation is various；Polarization Control Module type selecting is more
Sample；Material selection, the plated film mode of the devices such as beam-expanding collimation lens, polarization beam apparatus, high reflective mirror select various；Active polarization control
Systematic control algorithm implementation processed is various.
To sum up, the present invention is in High-power Laser Technologies field, particularly high-power narrow line width, linear polarization optical-fiber laser and its application
Field has great application value.
Brief description of the drawings
Fig. 1 is the principle schematic diagram of the present invention.
Figure includes：Narrow linewidth linear polarization optical fiber seed source 1, Polarization Control Module 2, non-polarization-maintaining Cascaded Optical Amplifier Transmission Systems 3,
Defocusing compensation type beam-expanding collimation system 4, integration polarization and optical signal extraction module 5, active polarization control system 6.
Wherein, two beam-expanding collimation modules and a fixture 47 and one are included in defocusing compensation type beam-expanding collimation system 4
Individual rotation external member 48：First beam-expanding collimation module includes the first beam-expanding collimation lens 41-1, the first beam-expanding collimation module inner casing 42-
1st, the first beam-expanding collimation module housing 43-1, the first heat conducting module 44-1, the first inlet opening 45-1, the first apopore 46-1；The
Two beam-expanding collimation modules include the second beam-expanding collimation lens 41-2, the second beam-expanding collimation module inner casing 42-2, the second beam-expanding collimation
Module housing 43-2, the second heat conducting module 44-2, the second inlet opening 45-2, the second apopore 46-2.
Integration polarization includes with optical signal extraction module 5：Turntable 51, polarization beam apparatus 52, high reflective mirror 53, taper are given up
Light collector 54, attenuation factor 55, photoelectric detection module 56, polarization beam apparatus refrigeration external member 57-1, high reflective mirror refrigeration external member 57-
2nd, inlet opening 58-1, apopore 58-2, turntable fixture 59.
Embodiment
Below in conjunction with the accompanying drawing in figure of the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out it is clear,
It is fully described by, is described in further details, but embodiments of the present invention is not limited only to this.
Reference picture 1, the present invention provide a kind of defocusing compensation type high-power narrow line width, linear polarization optical fiber laser generation system,
Expand including narrow linewidth linear polarization optical fiber seed source 1, Polarization Control Module 2, non-polarization-maintaining Cascaded Optical Amplifier Transmission Systems 3, defocusing compensation type
Beam colimated light system 4, integration polarization and optical signal extraction module 5 and active polarization control system 6.
Noted from the laser that narrow linewidth linear polarization optical fiber seed source 1 exports after Polarization Control Module 2 carries out polarization conversion
Enter into non-polarization-maintaining Cascaded Optical Amplifier Transmission Systems 3 and be amplified, the laser beam after amplification incides defocusing compensation type beam-expanding collimation
System 4, is collimated and aberration correction by the beam-expanding collimation lens in defocusing compensation type beam-expanding collimation system 4 to it.
In the present embodiment：Defocusing compensation type beam-expanding collimation system 4 includes rotating comprising two beam-expanding collimation modules and one
External member 48.Two beam-expanding collimation modules are respectively the first beam-expanding collimation module and the second beam-expanding collimation module.First beam-expanding collimation
Module includes the first beam-expanding collimation lens 41-1, the first beam-expanding collimation module inner casing 42-1, the first beam-expanding collimation module housing 43-
1st, the first heat conducting module 44-1, the first inlet opening 45-1, the first apopore 46-1；First beam-expanding collimation lens 41-1 is vertically-mounted
In the first beam-expanding collimation module inner casing 42-1, the first beam-expanding collimation module inner casing 42-1 is set in outside the first beam-expanding collimation module
In shell 43-1, it is provided between the first beam-expanding collimation module inner casing 42-1 and the first beam-expanding collimation module housing 43-1 for exporting
First heat conducting module 44-1 of used heat caused by beam-expanding collimation module.The first heat conducting module 44-1 includes the first inlet opening
45-1, the first apopore 46-1 and water cooling pipeline, outside cold water enter the first heat conducting module through the first inlet opening 45-1
Water cooling pipeline in 44-1, flowed out after Forced water cooling is carried out to beam-expanding collimation module through the first apopore 46-1.Second expands standard
Straight module includes the second beam-expanding collimation lens 41-2, the second beam-expanding collimation module inner casing 42-2, the second beam-expanding collimation module housing
43-2, the second heat conducting module 44-2, the second inlet opening 45-2, the second apopore 46-2.Each composition of second beam-expanding collimation module
Part and its annexation are identical with the first beam-expanding collimation module, will not be repeated here.Two beam-expanding collimation modules pass through rotation
The horizontal connection of external member 48 together, rotates outer casing screw of the both ends of external member 48 respectively with two beam-expanding collimation modules and is connected, lead to
Overwinding modulation section rotates external member 48, can adjust the spacing between two beam-expanding collimation lens.
Laser beam after the amplification of non-polarization-maintaining Cascaded Optical Amplifier Transmission Systems 3 is incident to first in the first beam-expanding collimation module
Beam-expanding collimation lens 41-1, it is tentatively collimated by the first beam-expanding collimation lens 41-1, the laser light velocity after preliminary collimation
It is then incident upon in the second beam-expanding collimation module, the second beam-expanding collimation lens 41-2 in the second beam-expanding collimation module swashs to incidence
Light light beam carries out secondary collimation and aberration correction.
The distance between first beam-expanding collimation lens 41-1 and the second beam-expanding collimation lens 41-2 are real by rotating external member 48
Now it can adjust.By rotating the horizontal connection of external member 48 between first beam-expanding collimation module and the second beam-expanding collimation module.First expands
It is connected through a screw thread, leads between beam collimating module and rotation external member 48, between the second beam-expanding collimation module and rotation external member 48
Overwinding modulation section rotates external member 48, and the first beam-expanding collimation lens 41-1 and second that can be adjusted in the first beam-expanding collimation module expands
The spacing between beam-expanding collimation lens 41-2 in beam collimating module, realizes the defocusing compensation under high power.First beam-expanding collimation
The spacing of final adjustment is according to non-polarization-maintaining Cascaded Optical Amplifier Transmission Systems 3 between lens 41-1 and the second beam-expanding collimation lens 41-2
The size of spot size determines jointly after core size, the size of defocus aberration and collimation.It is high-precision, a wide range of in order to realize
Defocusing compensation, the flight pitch in external member 48 and screw thread scope need to be rotated by careful design to be ensured to rotate the regulation essence of external member 48
Degree and adjustable range.
First beam-expanding collimation module inner casing 42-1 is extended in the second beam-expanding collimation module housing 43-2.Second beam-expanding collimation
A fixture 47 is provided with the outside of module housing 43-2, fixture 47 is a locking jackscrew.First beam-expanding collimation module inner casing
42-1 is in the lock-in range of fixture 47.Specifically, lock jackscrew through the perforation on the second beam-expanding collimation module housing 43-2 from
Stretching into the first beam-expanding collimation module inner casing 42-1 on the inside of shell is extend on the outside of second beam-expanding collimation module housing 43-2
Position locks.The lock hole coordinated with locking jackscrew is offered on the first beam-expanding collimation module inner casing 42-1, locks jackscrew
Insert corresponding lock hole and realize that position locks.Further, fixture 47 is used to rotation external member 48 being fixed on optimal location.
Locking jackscrew inserts the first beam-expanding collimation mould after can also sequentially passing through rotation external member 48, the second beam-expanding collimation module housing 43-2
Locking is realized on block inner casing 42-1 in corresponding lock hole, optimal position can be fixed on by rotation external member 48 by so locking jackscrew
Put.Offered in rotation external member, the first beam-expanding collimation module inner casing or/and the second beam-expanding collimation module housing multiple for locking
The interspersed lock hole of jackscrew, it is easy to adjust the position of locking jackscrew locking according to actual conditions.In real application systems, when from
After burnt compensation effect reaches target, the first beam-expanding collimation module and the second beam-expanding collimation can be locked by adjusting fixture 47
Relative position between module, that is, realize the locking of spacing between beam-expanding collimation lens 41-1 and 41-2.
Heat conducting module in defocusing compensation type beam-expanding collimation system 4 is used to export the generation of defocusing compensation type beam-expanding collimation system
Used heat, prevent heat accumulation.First heat conducting module 44-1 is embedded in the first beam-expanding collimation module inner casing 42-1 and first and expands standard
Between straight module housing 43-1, the second heat conducting module 44-2 is embedded in the second beam-expanding collimation module inner casing 42-2 and second and expands standard
Between straight module housing 43-2.First heat conducting module 44-1 and the second heat conducting module 44-2 are internally provided with water cooling pipeline.First
Heat conducting module 44-1 water cooling tube route the first inlet opening 45-1 and the first apopore 46-1 UNICOMs, the second heat conducting module 44-2's
Water cooling tube route the second inlet opening 45-2 and the second apopore 46-2 UNICOMs.First heat conducting module 44-1 and the second heat conducting module
44-2 is used to export the used heat in whole defocusing compensation type beam-expanding collimation system 4, prevents heat accumulation, influences systematic function,
Its material can be the Heat Conduction Materials such as aluminium alloy, copper.When optical-fiber laser operates in it is high-power when, the first inlet opening 45-1, first
Inlet opening 45-2 and the second apopore 46-1, the second apopore 46-2 will be connected with extraneous water-cooling system, and defocusing compensation type is expanded
Beam colimated light system 4 carries out Forced water cooling.
Laser beam through the collimation output of defocusing compensation type beam-expanding collimation system 4 is injected into integration polarization and carried with optical signal
Modulus block 5.Integration polarization is arranged on turntable 51 with optical signal extraction module 5, turntable 51 realize integration polarization with
360 degree of optical signal extraction module 5 are rotatable.Turntable fixture 59 can realize turntable and the second beam-expanding collimation module it
Between position locking, turntable fixture 59 is a locking jackscrew, and the second beam-expanding collimation module inner casing 42-2 stretches to turntable
And be embedded among turntable 51, the second beam-expanding collimation module inner casing 42-2 is in the lock-in range of turntable fixture 59, and second
Can be by locking jackscrew locking connection between beam-expanding collimation module inner casing 42-2 and turntable 51.Fixed by adjusting turntable
Part 59, integration polarization and the locking between optical signal extraction module 5 and defocusing compensation type beam-expanding collimation system 4 can be realized.
In practical operation, when adjusting turntable 51 so that system output main laser power reaches maximum, it can be consolidated by turntable
Determine part 59 and lock turntable 51.
Integration polarization includes polarization beam apparatus 52, high reflective mirror 53, the useless light collector of taper with optical signal extraction module 5
54th, attenuation factor 55 and photoelectric detection module 56.Polarization beam apparatus 52 is arranged on turntable 51.By adjusting turntable 51,
The optimal incident angle in fact incided on polarization beam apparatus 52 can be selected, realizes the pure linearly polarized laser output of peak power.
Laser beam through the collimation output of defocusing compensation type beam-expanding collimation system 4 is incided on polarization beam apparatus 52, by polarization beam apparatus
Incident laser beam is divided into s light beams and p-polarization light beam two-way light beam by 52, and p-polarization light beam is output to certainly as main laser
By space, s light beams incide high reflective mirror 53, s light beams after high reflective mirror 53, most of light beam by taper give up light collect
Device 54 is collected, and sub-fraction light beam incides attenuation factor 55；Attenuation factor 55 is used to enter the laser intensity of high reflective mirror transmission
Row decay, prevents photoelectric detection module from saturation occurs；Laser beam after attenuation factor 55 is injected into photoelectric detection module 56；
The optical signal of incident laser beam is converted to electric signal by photoelectric detection module 56, and the electric signal after conversion is conveyed to actively
Polarization control system 6.Active polarization control system 6 detects to integration polarization with photoelectric detection module in optical signal extraction module
Electric signal carry out algorithm process, obtain polarization control signal, and then be applied to Polarization Control Module, realize closing for whole system
Ring controls.Active polarization control system algorithm implementation is various, can be random paralleling gradient descent algorithm, climbing method etc..
In integration polarization and optical signal extraction module 5, in order to reduce the thermal distoftion of system, polarization beam apparatus 52 and height
Anti- mirror 53 is respectively assembled on polarization beam apparatus refrigeration external member 57-1 and high reflective mirror refrigeration external member 57-2.The specific knot for external member of freezing
Structure determines according to the shape and type of polarization beam apparatus 52 and high reflective mirror 53.For laminated structure, refrigeration external member is generally outside
Cuboid refrigerating machine part with paddle hole, the internal water cooling pipeline for being provided with UNICOM's paddle hole, and set on the mechanical parts
It is equipped with mounting bracket, the mounting structure such as mounting hole for installing polarization beam apparatus 52 or high reflective mirror 53.
In the present invention, integration polarization is again provided with water cooling pipeline with optical signal extraction module 5, and water cooling pipeline is coated on
Integration polarization with the outside of optical signal extraction module 5 and with polarization beam apparatus refrigeration external member 57-1, high reflective mirror refrigeration external member 57-
2 UNICOMs, integration polarization are provided with the inlet opening being connected with extraneous water-cooling system with the water cooling pipeline of optical signal extraction module 5
58-1, apopore 58-2.When operating in high-power, inlet opening 58-1 and apopore 58-2 will be connected with extraneous water-cooling system,
Forced water cooling is carried out with optical signal extraction module 5 to integration polarization, it is ensured that stable system performance.
In the present invention, integration polarization is used to change light path with the high reflective mirror in optical signal extraction module 5, its constituent material
It is unlimited, multiple choices can be had according to output laser power density.Reflected wavelength range is by narrow linewidth linear polarization optical fiber seed source
Cardiac wave length determines.Taper gives up light collector for collecting remaining useless light after Polarization Control, and attenuation factor is for saturating to high reflective mirror
The laser intensity penetrated is decayed, and prevents photoelectric detection module from saturation occurs.Photoelectric detection module converts optical signals to telecommunications
Number, its response wave length is determined by narrow linewidth linear polarization optical fiber seed source centre wavelength.Heat-conducting layer is used to give up caused by guiding system
Heat, prevents heat accumulation, and fixture is used for the fixation of integration polarization and optical signal extraction module.
Claims (10)
1. a kind of defocusing compensation type high-power narrow line width, linear polarization optical fiber laser generation system, it is characterised in that：Including narrow linewidth
Linear polarization optical fiber seed source, Polarization Control Module, non-polarization-maintaining Cascaded Optical Amplifier Transmission Systems, defocusing compensation type beam-expanding collimation system, one
Body polarization and optical signal extraction module and active polarization control system；
Amplify successively by Polarization Control Module, non-polarization-maintaining cascaded optical fiber from the laser of narrow linewidth linear polarization optical fiber seed source output
Enter integration polarization and optical signal extraction module, integration polarization and optical signal after device, defocusing compensation type beam-expanding collimation system
Extraction module includes polarization beam apparatus, high reflective mirror, taper useless light collector, attenuation factor and photoelectric detection module, is mended through defocus
The laser beam for repaying the collimation output of type beam-expanding collimation system is incided on polarization beam apparatus, by polarization beam apparatus by incident laser light
Beam is divided into s light beams and p-polarization light beam two-way light beam, and p-polarization light beam is output to free space, s polarised lights as main laser
Beam incides high reflective mirror, and after high reflective mirror, most of s light beams reflex to the useless light of taper by high reflective mirror and collected s light beams
Device and collected by the taper light collector that gives up, sub-fraction s light beams are transmitted to attenuation factor from high reflective mirror；Declined through attenuation factor
Laser beam after subtracting is injected into photoelectric detection module；Photoelectric detection module will incide the laser beam of photoelectric detection module
Optical signal is converted to electric signal, and the electric signal after conversion is conveyed into active polarization control system；Active polarization control system
The electric signal of photoelectric detection module feedback is handled, obtains polarization control signal, and polarization control signal is applied to partially
Shake control module, realize the closed-loop control of whole system.
2. defocusing compensation type high-power narrow line width according to claim 1, linear polarization optical fiber laser generation system, its feature
It is：It is injected into from the laser of narrow linewidth linear polarization optical fiber seed source output after Polarization Control Module carries out polarization conversion non-
It is amplified in polarization-maintaining Cascaded Optical Amplifier Transmission Systems, the laser beam after amplification incides defocusing compensation type beam-expanding collimation system, leads to
It is collimated the beam-expanding collimation lens crossed in defocusing compensation type beam-expanding collimation system and aberration correction.
3. defocusing compensation type high-power narrow line width according to claim 1 or 2, linear polarization optical fiber laser generation system, its
It is characterised by：Defocusing compensation type beam-expanding collimation system includes two beam-expanding collimation modules, incides defocusing compensation type beam-expanding collimation
The laser beam of system is tentatively collimated by the beam-expanding collimation lens in first beam-expanding collimation module to it first, preliminary accurate
Laser beam after straight is carried out secondary collimation and aberration to it by the beam-expanding collimation lens in second beam-expanding collimation module and rectified
Just export afterwards.
4. defocusing compensation type high-power narrow line width according to claim 3, linear polarization optical fiber laser generation system, its feature
It is：Beam-expanding collimation module includes tubular inner casing, cylindrical outer casing, heat conducting module and beam-expanding collimation lens, and the beam-expanding collimation is saturating
Mirror is vertically installed in inner casing, and the inner casing is set in shell, is provided between inner casing and shell for exporting beam-expanding collimation
The heat conducting module of used heat caused by module；Two beam-expanding collimation modules are connected horizontally on together by rotating external member, rotate external member
Outer casing screw of the both ends respectively with two beam-expanding collimation modules be connected, adjust rotation external member by rotating, two can be adjusted
Spacing between beam-expanding collimation lens.
5. defocusing compensation type high-power narrow line width according to claim 4, linear polarization optical fiber laser generation system, its feature
It is：The heat conducting module includes inlet opening, apopore and water cooling pipeline, and outside cold water enters heat conduction mould through inlet opening
Water cooling pipeline in block, flowed out after Forced water cooling is carried out to beam-expanding collimation module through apopore.
6. defocusing compensation type high-power narrow line width according to claim 4, linear polarization optical fiber laser generation system, its feature
It is：Two beam-expanding collimation modules are set to the first beam-expanding collimation module and the second beam-expanding collimation module, the first beam-expanding collimation
Inner casing in module is extend between the inner casing and shell of the second beam-expanding collimation module, the outer side of the second beam-expanding collimation module
A locking jackscrew is provided with, locking jackscrew extend on the inside of shell on the outside of shell through the perforation on shell and expands standard by first
The inner casing of straight module stretches into position locking, offers what is coordinated with locking jackscrew on the inner casing of the first beam-expanding collimation module
Lock hole, locking jackscrew insert corresponding lock hole and realize locking.
7. defocusing compensation type high-power narrow line width according to claim 1, linear polarization optical fiber laser generation system, its feature
It is：Integration polarization is set on a spinstand with optical signal extraction module, and turntable can realize that integration polarization is believed with light
360 degree of number extraction module are rotatable；The turntable also includes fixture, and fixture can realize the locking of turntable.
8. defocusing compensation type high-power narrow line width according to claim 6, linear polarization optical fiber laser generation system, its feature
It is：Integration polarization is respectively assembled at water cooled refrigeration external member with the polarization beam apparatus in optical signal extraction module and high reflective mirror
On；Integration polarization is provided with water cooling pipeline with optical signal extraction module, and water cooling pipeline is coated on integration polarization and optical signal
The water cooled refrigeration external member of the outside of extraction module, polarization beam apparatus and high reflective mirror is extracted with integrated polarization with optical signal respectively
The mutual UNICOM of water cooling pipeline in module, the water cooling pipeline of integration polarization and optical signal extraction module are provided with and extraneous water cooling
The water inlet and delivery port of system connection, the cold water in extraneous water-cooling system is after water inlet enters water cooling pipeline respectively to installation
Polarization beam apparatus and high reflective mirror in water cooled refrigeration external member carry out Forced water cooling.
9. defocusing compensation type high-power narrow line width according to claim 1, linear polarization optical fiber laser generation system, its feature
It is：The narrow linewidth linear polarization optical fiber seed source is single-frequency linear polarization optical fiber seed source, single-frequency linear polarization optical fiber seed through phase
Narrow-linewidth laser source, directly narrow linewidth linear polarization optical fiber seed source, superfluorescence light caused by vibration chamber caused by the modulator approach of position
Narrow linewidth linear polarization optical-fiber laser kind caused by narrow linewidth linear polarization optical fiber seed source caused by the filtering of source or Random Laser filtering
Component.
10. defocusing compensation type high-power narrow line width according to claim 1, linear polarization optical fiber laser generation system, it is special
Sign is：Described Polarization Control Module is that input polarization light can be converted to the automatically controlled Polarization Controller for it is expected to polarize light output
Part, Polarization Control Module are orientation angle-style Polarization Control Module, retardation type Polarization Control Module or azimuth-retardation type
Polarization Control Module.
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| CN111564751A (en) * | 2020-05-18 | 2020-08-21 | 中国人民解放军国防科技大学 | High-power narrow-linewidth optical fiber laser polarization control system and method |
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Application publication date: 20180213 |