CN109346911A - A kind of tens of megahertzs of Gao Zhongying nanoseconds full optical fiber laser amplifier - Google Patents
A kind of tens of megahertzs of Gao Zhongying nanoseconds full optical fiber laser amplifier Download PDFInfo
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- CN109346911A CN109346911A CN201811576038.8A CN201811576038A CN109346911A CN 109346911 A CN109346911 A CN 109346911A CN 201811576038 A CN201811576038 A CN 201811576038A CN 109346911 A CN109346911 A CN 109346911A
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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
- H01S3/06716—Fibre compositions or doping with active elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
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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
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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
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06741—Photonic crystal fibre, i.e. the fibre having a photonic bandgap
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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
- H01S3/06791—Fibre ring lasers
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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Abstract
The invention discloses a kind of tens of megahertzs of Gao Zhongying nanoseconds full optical fiber laser amplifiers, including single mode optical fiber seed source, fiber stretcher, fiber optic power amplifier and signal light output system, single mode optical fiber seed source is the Gao Zhongying picosecond pulse laser that passive mode-locking is realized based on semiconductor saturable absorber；Fiber stretcher is made of Dispersive Devices and the matched fiber optic telecommunications equipment used, for broadening prime picosecond pulse to several nanoseconds of magnitudes；Fiber optic power amplifier is to cascade the master oscillator power amplifier formed by multi-stage fiber amplifier.The present invention passes through each parameter of optimal cavity, the tens of megahertzs of Gao Zhongying mode locking picosecond pulse injection fibre stretchers that will be obtained, realize the high repetition pulse output of several nanoseconds stable of magnitudes, then multistage amplification is carried out to pulse using gain fibre, it is final to realize Gao Zhongying high power nanosecond pulse output, and system realizes all-fiber, the operation is stable, high reliablity.
Description
Technical field
The present invention relates to optical fiber laser fields, more particularly to a kind of tens of megahertzs of Gao Zhongying nanoseconds full optical fiber laser to put
Big device.
Background technique
Pulse optical fiber has compact-sized, the operation is stable, convenient for heat management, beam quality height and light light conversion effect
The features such as rate is high is just widely developed and applies, and wherein nanosecond optical fiber laser is as this field important branch, especially
Tens of megahertzs of high repetition frequencies, high-average power, pulsewidth be nanosecond order optical fiber laser in laser ranging, laser radar
System and special material processing and other fields application value are outstanding day by day.
The signal light generating device of current nanosecond optical fiber laser is usually: Q-switch solid laser adjusts Q optical fiber laser
With pulse modulated semiconductor laser, the reasons such as the delay of Q-switch modulating frequency or control circuit are limited to, laser is caused
The nanosecond pulse repetition exported after modulation is extremely difficult to order of megahertz, and traditional Q-regulating technique only has energy width to pulse
Modulation on degree, without PGC demodulation between each oscillation mode, and will lead to the tune Q nanosecond pulse of output in the time domain and it is unstable and
With shake.Low repetition nanosecond pulse carries out single pulse energy height when master oscillation power amplification, amplifies the peak value function of afterpulse
Rate is easily more than the threshold value of a variety of nonlinear effects in optical fiber, and the nonlinear effect of enhancing reduces the light light conversion effect of system
Rate makes low repetition nanosecond pulse be difficult to obtain high-power output.
The pulse of the optical fiber laser output of passive mode-locking is realized using semiconductor saturable absorber compared with Q-regulating technique
Sequence repetition is at tens of megahertzs and stablizes neatly, then the pulse for nanosecond order is broadened using Dispersive Devices, rear
Peak power significantly reduces when grade amplification, therefore the signal light generating device that will be more suitable for nanosecond optical fiber laser.Pass through
Passive mode-locking makes the phase of oscillation mode independent in resonant cavity connect each other and be locked together, and power coupling occurs for each oscillation mode
It closes and no longer independent, thus the neat difference very little between stable continuous locking mold pulse train and pulse shape of output one.But
It is the pulse repetition of the current optical fiber laser output that passive mode-locking is realized using semiconductor saturable absorber ten to two ten
Megahertz or so, realizing the stable mode locking pulse of more Gao Zhongying, there is still a need for each parameters in reasonably optimizing resonant cavity.
More importantly when carrying out power amplification to nanosecond pulse, with the raising of power especially peak power,
Pulse and the interaction of optical fiber become obviously with the increase of fiber lengths, and the generation of especially various nonlinear effects will
Inhibit the raising of output power.Therefore traditional doubly clad optical fiber will not be double in applicable instead highly doped large mode field
Cladded-fiber and large mode field double clad doped photon crystal optical fiber, they are by increasing fibre core effective core area, reducing optical fiber
Length and special space structure improve nonlinear effect threshold value, then realize high power pulsed ion beams output.But it is this special
When the other optical fiber of large core fiber and system of structure realize the welding of high quality all-fiber, special optical fiber heat sealing machine is needed,
Optimize fusion process, from the necessary process such as master editor's welding procedure, is otherwise difficult to realize the all-fiber of whole system, direct shadow
The delivery efficiency and job stability of acoustic system.
Summary of the invention
For the deficiency of background technique, the present invention proposes a kind of tens of megahertzs of Gao Zhongying nanosecond full optical fiber lasers amplification
Device overcomes traditional nanosecond optical fiber laser pulse repetition and the not high technical problem of all-fiber degree.
The present invention is achieved by the following technical solutions:
A kind of tens of megahertzs of Gao Zhongying nanoseconds full optical fiber laser amplifier, including the single mode optical fiber set gradually along optical path
Seed source (1), fiber stretcher (2), fiber optic power amplifier (3) and signal light output system (4).Single mode optical fiber seed source
(1) mode locking pulse for exporting stable tens of megahertzs of Gao Zhongyings picosecond or femtosecond magnitude, passes through single mode prime amplifier injection light
After fine stretcher (2), pulse was broadened to several nanoseconds, then carried out the cascade power amplification of 3-stage optical fiber amplifier to pulse,
To inhibit the nonlinear effect accumulated in optical fiber, the gain fibre of main amplifier stage is using highly doped large mode field doubly clad optical fiber or greatly
Mould field double clad doped photon crystal optical fiber finally carries out cladding light and strips and end cap output.Pass through between the modules
Fused fiber splice forms the closed system of an all-fiber.
The single mode optical fiber seed source (1) includes mode locking oscillator and single mode prime amplifier.The mode locking oscillator is benefit
The short cavity mode locking oscillator or harmonic mode locking oscillator that passive mode-locking is realized with semiconductor saturable absorber, by optimizing mode locking
The output of Gao Zhongying mode locking pulse can be achieved in each parameter of oscillator.
The short cavity mode locking oscillator includes fiber grating, the first optical fibre wavelength division multiplexer, the first gain fibre, the first light
Coupler, the first semiconductor saturable absorber, the first semiconductor pump laser.Above-mentioned each optical device is in turn connected to form
Line style resonant cavity, the fine input terminal of the first semiconductor pump laser output end connection the first optical fibre wavelength division multiplexer pumping, first
The output end of photo-coupler will be outside mode locking pulse output cavity.By control gain fibre doping concentration, broadband reflection it is anti-
Cavity length is shortened in the measures such as each device tail optical fiber length in fiber grating and control oscillator, realizes short cavity mode locking oscillator
The stable mode-locking pulse train output of tens of megahertzs of Gao Zhongyings.
The harmonic mode locking oscillator includes the second optical fibre wavelength division multiplexer, the second gain fibre, embedded Polarization Control
Device, passive single mode optical fiber, the first optical fiber circulator, the second semiconductor saturable absorber, the first signal optoisolator, the second light
Coupler, the second semiconductor pump laser.Above-mentioned each optical device is in turn connected to form closure ring shape resonator, and the second half lead
Body pump laser output end connects the second optical fibre wavelength division multiplexer and pumps fine input terminal, and the output end of the second photo-coupler will be locked
Outside mould pulse output cavity.By controlling passive single-mode optical fiber length and adjusting the pressure and rotation of embedded Polarization Controller
Angle can realize that stable mode-locking pulse exports, then the appropriate available multiple-pulse stable mode-locking of pumping injecting power that increases exports,
And pulse repetition is adjustable between ten megahertzs to hundred megahertzs.
The single mode prime amplifier include second signal optoisolator, third optical fibre wavelength division multiplexer, third gain fibre,
Third semiconductor pump laser.The output end of first photo-coupler or the second photo-coupler connects second signal optical isolation
Device input terminal, second signal optoisolator output end connect third optical fibre wavelength division multiplexer signal end, and third is semiconductor pumped to swash
Light device output end connects third optical fibre wavelength division multiplexer and pumps fine input terminal, and third optical fibre wavelength division multiplexer common end connects third
Gain fibre input terminal.
The fiber stretcher (2) includes Dispersive Devices, the second optical fiber circulator, signal light reflecting device.Third gain
Fiber-optic output connects the second optical fiber circulator input terminal, and the second optical fiber circulator reflection end connects Dispersive Devices input terminal, institute
State Dispersive Devices output end connection signal light reflecting device input terminal.
Optionally, the Dispersive Devices can be one of high dispersion single-mode optical fiber and chirped fiber grating or a variety of.
The high dispersion single-mode optical fiber is the high dispersion single-mode optical fiber of polarization-maintaining or the high dispersion single-mode optical fiber of non-polarization-maintaining.
Optionally, the signal light reflecting device is fiber grating, semiconductor saturable absorber, one in total reflective mirror
Kind.
The fiber optic power amplifier (3) is made of 3-stage optical fiber amplifier cascade, wherein first order fiber amplifier packet
Include the 4th semiconductor pump laser, the 4th optical fibre wavelength division multiplexer, the 4th gain fibre, bandpass filter, third signal light
Isolator；Second level fiber amplifier include the 5th semiconductor pump laser, the first optical-fiber bundling device, the 5th gain fibre,
Fourth signal optoisolator；Third level fiber amplifier includes the 6th semiconductor pump laser, the second optical-fiber bundling device, the 6th
Gain fibre.
Second optical fiber circulator output end connects the 4th optical fibre wavelength division multiplexer signal end, the 4th semiconductor pump laser
The 4th optical fibre wavelength division multiplexer pumping end is connected, the 4th optical fibre wavelength division multiplexer common end connects the 4th gain fibre input terminal,
4th gain fibre output end connects bandpass filter input terminal, and it is defeated that bandpass filter output end connects third signal optoisolator
Enter end.Third signal optoisolator output end connects the first optical-fiber bundling device input terminal, the connection of the 5th semiconductor pump laser
First optical-fiber bundling device pumps end, and the first optical-fiber bundling device output end connects the 5th gain fibre input terminal, the 5th gain fibre
Output end connects fourth signal optoisolator input terminal.Fourth signal optoisolator output end connects the input of the second optical-fiber bundling device
End, the 6th semiconductor pump laser connect the second optical-fiber bundling device and pump end, the second optical-fiber bundling device output end connection the 6th
Gain fibre input terminal.
Optionally, the 6th gain fibre is highly doped large mode field doubly clad optical fiber and large mode field double clad doping photon
One of crystal optical fibre is a variety of, and is all made of all-fiber welding with the second optical-fiber bundling device output end.
The signal light output system (4) includes cladding light device for stripping and end cap output device, and successively welding is in optical fiber
The output end of power amplifier.By coating high refractive index heat-conducting medium outside the doubly clad optical fiber of removal coat, packet is stripped
Residual pump light and other cladding lights in layer.
The present invention have it is following the utility model has the advantages that
1. short cavity mode locking oscillator or the tens of megahertzs of Gao Zhongying mode locking picosecond pulses warp of harmonic mode locking oscillator output
Tens of megahertzs of Gao Zhongying high power nanosecond pulses can be obtained to several nanoseconds of magnitudes and after amplifying in broadening, relatively generally adjust Q nanosecond arteries and veins
Rush more stable neat, duty ratio is higher；
2. the 6th gain fibre is using the highly doped large mode field doubly clad optical fiber and large mode field double clad of polarization-maintaining or non-polarization-maintaining
One of doped photon crystal optical fiber is a variety of, and is all made of all-fiber welding with the second optical-fiber bundling device output end, can
The nonlinear effect accumulated in system is effectively reduced, system light light conversion efficiency is improved and realizes the all-fiber of system.
3. system forms a closed optical system, all-fiber system the operation is stable, reliability by fused fiber splice
Height is easy to encapsulate.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples:
Attached drawing 1 is the module diagram of one embodiment of the invention
Attached drawing 2 is the light channel structure figure of the short cavity mode locking oscillator in one embodiment of the invention
Attached drawing 3 is the light channel structure figure of the harmonic mode locking oscillator in one embodiment of the invention
Attached drawing 4 is the light channel structure figure of one embodiment of the invention
In figure: (1) single mode optical fiber seed source, (2) fiber stretcher, (3) fiber optic power amplifier, (4) signal light output
System；1-single mode optical fiber seed source, 2-second signal optoisolators, 3-third semiconductor pump lasers, 4-third light
Fine wavelength division multiplexer, 5-third gain fibres, the 6-the second optical fiber circulator, 7-Dispersive Devices, 8-signal light reflecting devices,
9-the four semiconductor pump laser, the 10-the four optical fibre wavelength division multiplexer, the 11-the four gain fibre, 12-bandpass filterings
Device, 13-third signal optoisolators, the 14-the five semiconductor pump laser, the 15-the first optical-fiber bundling device, 16-the five
Gain fibre, 17-fourth signal optoisolators, the 18-the six semiconductor pump laser, the 19-the second optical-fiber bundling device,
20-the six gain fibre, 21-pumping device for stripping, 22-end caps, 23-fiber gratings, 24-the first is semiconductor pumped sharp
Light device, the 25-the first optical fibre wavelength division multiplexer, the 26-the first gain fibre, the 27-the first photo-coupler, the 28-the first semiconductor
Saturable absorber, the 29-the second optical fibre wavelength division multiplexer, the 30-the second gain fibre, 31-embedded Polarization Controllers,
32-passive single mode optical fibers, the 33-the first optical fiber circulator, the 34-the second semiconductor saturable absorber, the 35-the first signal light
Isolator, the 36-the second photo-coupler, the 37-the second semiconductor pump laser.
Specific embodiment
It is clear in order to be more clear the purpose of the present invention, technical solution and advantage, below in conjunction with attached drawing and specific implementation
Example is described further, and described herein the examples are only for explaining the invention, but does not limit the present invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of tens of megahertzs of Gao Zhongying nanoseconds full optical fiber laser amplifier, packet
It includes: including single mode optical fiber seed source (1), fiber stretcher (2), fiber optic power amplifier (3) and signal light output system (4),
It is characterized in that the single mode optical fiber seed source (1) is the short cavity mode locking for realizing passive mode-locking based on semiconductor saturable absorber
The output of Gao Zhongying mode locking pulse can be achieved by optimization each parameter of mode locking oscillator in oscillator or harmonic mode locking oscillator；Institute
Stating fiber stretcher (2) is Dispersive Devices and the matched fiber optic telecommunications equipment used；The fiber optic power amplifier is served as reasons
The master oscillator power amplifier of multi-stage fiber amplifier cascade composition, to inhibit the nonlinear effect accumulated in optical fiber, main amplification
The gain fibre of grade uses highly doped large mode field doubly clad optical fiber or large mode field double clad doped photon crystal optical fiber；The signal
Light output system (4) is cladding light device for stripping and end cap output device.
As shown in Fig. 2, the short cavity mode locking oscillator includes fiber grating 23, the first optical fibre wavelength division multiplexer 25, first
Gain fibre 26, the first photo-coupler 27, the first semiconductor saturable absorber 28, the first semiconductor pump laser 24.On
It states each optical device and is in turn connected to form line style resonant cavity, 24 output end of the first semiconductor pump laser connects the first optical fiber wave
Division multiplexer 25 pumps fine input terminal, and the output end of the first photo-coupler 27 will be outside mode locking pulse output cavity.Pass through control
The doping concentration of gain fibre is contracted using measures such as each device tail optical fiber length in the fiber grating and control oscillator of broadband reflection
Short oscillation cavity length makes short cavity mode locking oscillator realize the pulse train output of tens of megahertzs of Gao Zhongyings.
As shown in figure 3, the harmonic mode locking oscillator include the second optical fibre wavelength division multiplexer 29, the second gain fibre 30,
Embedded Polarization Controller 31, passive single mode optical fiber 32, the first optical fiber circulator 33, the second semiconductor saturable absorber 34,
First signal optoisolator 35, the second photo-coupler 36, the second semiconductor pump laser 37.Above-mentioned each optical device successively connects
It connects to form closure ring shape resonator, 37 output end of the second semiconductor pump laser connects the pumping of the second optical fibre wavelength division multiplexer 29
The output end of fine input terminal, the second photo-coupler 36 will be outside mode locking pulse output cavity.It is long by controlling passive single mode optical fiber
The pressure and rotation angle for spending and adjusting embedded Polarization Controller can realize that stable mode-locking pulse exports, then appropriate increase pumping
The available multiple-pulse stable mode-locking output of injecting power, and pulse repetition is adjustable between ten megahertzs to hundred megahertzs.
As shown in figure 4, the output end of seed source 1 is connected with 2 input terminal of second signal optoisolator, to guarantee mode locking arteries and veins
Stability is rushed not by the interference of feedback light, pulse is output and then enter single mode prime amplifier through second signal optoisolator 2.
Single mode prime amplifier include second signal optoisolator 2, third optical fibre wavelength division multiplexer 4, third gain fibre 5,
Third semiconductor pump laser 3.1 output end of seed source connects 2 input terminal of second signal optoisolator, second signal light
2 output end of isolator connects 4 signal end of third optical fibre wavelength division multiplexer, 3 output end of third semiconductor pump laser connection the
Three optical fibre wavelength division multiplexers 4 pump fine input terminal, and 4 common end of third optical fibre wavelength division multiplexer connects third gain fibre 5 and inputs
End.
Fiber stretcher (2) includes Dispersive Devices 7, the second optical fiber circulator 6, signal light reflecting device 8.Third gain light
Fine 5 output ends connect the input terminal of the second optical fiber circulator 6, the reflection end connection Dispersive Devices 7 of the second optical fiber circulator 6
Input terminal, 7 output end connection signal light reflecting device of Dispersive Devices, 8 input terminal.
Fiber optic power amplifier (3) is made of 3-stage optical fiber amplifier cascade, and wherein first order fiber amplifier includes the
Four semiconductor pump lasers 9, the 4th optical fibre wavelength division multiplexer 10, the 4th gain fibre 11, bandpass filter 12, third signal
Optoisolator 13；Second level fiber amplifier includes the 5th semiconductor pump laser 14, the increasing of the first optical-fiber bundling device the 15, the 5th
Beneficial optical fiber 16, fourth signal optoisolator 17；Third level fiber amplifier includes the 6th semiconductor pump laser 18, the second light
Fine bundling device 19, the 6th gain fibre 20.
Second optical fiber circulator, 6 output end connects 10 signal end of the 4th optical fibre wavelength division multiplexer, and the 4th is semiconductor pumped sharp
Light device 9 connects the 4th optical fibre wavelength division multiplexer 10 and pumps end, and 10 common end of the 4th optical fibre wavelength division multiplexer connects the 4th gain light
Fibre 11,11 output end of the 4th gain fibre connect 12 input terminal of bandpass filter, and 12 output end of bandpass filter connects third letter
Number 13 input terminal of optoisolator.13 output end of third signal optoisolator connection 15 input terminal of the first optical-fiber bundling device, the 5th half
Conductor pump laser 14 connects the first optical-fiber bundling device 15 and pumps end, and 15 output end of the first optical-fiber bundling device connection the 5th increases
Beneficial optical fiber 16,16 output end of the 5th gain fibre connect 17 input terminal of fourth signal optoisolator.Fourth signal optoisolator 17
Output end connects 19 input terminal of the second optical-fiber bundling device, and the 6th semiconductor pump laser 18 connects the second optical-fiber bundling device 19
End is pumped, 19 output end of the second optical-fiber bundling device connects 20 input terminal of the 6th gain fibre.
Signal light output system (4) includes pump light device for stripping and end cap output device, and successively welding is in the 6th gain
20 output end of optical fiber.Method by coating high refractive index heat-conducting medium outside the doubly clad optical fiber of removal coat, strips packet
Residual pump light and other cladding lights in layer.
Optionally, the single mode optical fiber seed (1) is the short cavity that passive mode-locking is realized based on semiconductor saturable absorber
Mode locking oscillator or harmonic mode locking oscillator.
Optionally, the Dispersive Devices are one of high dispersion single-mode optical fiber and chirped fiber grating or a variety of.
Optionally, the signal light reflecting device is fiber grating, semiconductor saturable absorber, one in total reflective mirror
Kind.
Optionally, the 6th gain fibre is that highly doped large mode field doubly clad optical fiber and large mode field double clad adulterate photon
One of crystal optical fibre is a variety of, and is all made of all-fiber welding with the second optical-fiber bundling device output end.
Optionally, single mode optical fiber seed source (1) the output mode locking pulse repetition is 10-100MHz.
Optionally, the pulsewidth of the nanosecond pulse signal light is 1ns -10ns.
Present invention design is simple, compact-sized, meets tens of megahertzs of Gao Zhongying high power nanosecond pulses under all-fiber
Output.
Finally it should be noted that the above description is only an embodiment of the present invention, it is not intended to limit patent model of the invention
It encloses, it is all using equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, directly or indirectly transport
Used in other related technical areas, it is included within the scope of the present invention.
Claims (10)
1. a kind of tens of megahertzs of Gao Zhongying nanoseconds full optical fiber laser amplifier, which is characterized in that including being set gradually along optical path
Single mode optical fiber seed source (1), fiber stretcher (2), fiber optic power amplifier (3) and signal light output system (4), the list
Mode fiber seed source (1) is the short cavity mode locking oscillator or harmonic mode locking that passive mode-locking is realized using semiconductor saturable absorber
Oscillator realizes tens of megahertzs of Gao Zhongying mode locking pulse outputs by optimizing mode locking oscillator parameter；The fiber stretcher
(2) it is made of Dispersive Devices and the matched fiber optic telecommunications equipment used, fiber optic power amplifier (3) is to be put by multi-stage fiber
The master oscillator power amplifier of big device cascade composition.
2. tens of megahertzs of one kind according to claim 1 Gao Zhongying nanosecond full optical fiber laser amplifier, it is characterised in that:
The single mode optical fiber seed source (1) includes mode locking oscillator and single mode prime amplifier；The mode locking oscillator is to utilize semiconductor
The short cavity mode locking oscillator or harmonic mode locking oscillator of saturable absorber realization passive mode-locking；
The short cavity mode locking oscillator includes fiber grating, the first optical fibre wavelength division multiplexer, the first gain fibre, the first optical coupling
Device, the first semiconductor saturable absorber, the first semiconductor pump laser；Above-mentioned each optical device is in turn connected to form line style
Resonant cavity, semiconductor pump laser output end connect optical fibre wavelength division multiplexer and pump fine input terminal, the output end of photo-coupler
It will be outside mode locking pulse output cavity；
The short cavity mode locking oscillator is shaken by control gain fibre doping concentration, using the fiber grating and control of broadband reflection
Swing each device tail optical fiber length in device makes short cavity mode locking oscillator realize repetition 15MHz -50MHz amount to shorten cavity length
The stable pulse sequence output of grade；
The harmonic mode locking oscillator includes the second optical fibre wavelength division multiplexer, the second gain fibre, embedded Polarization Controller, nothing
Source single mode optical fiber, the first optical fiber circulator, the second semiconductor saturable absorber, the first signal optoisolator, the second optical coupling
Device, the second semiconductor pump laser；Above-mentioned each optical device is in turn connected to form closure ring shape resonator, semiconductor pumped to swash
Light device output end connects optical fibre wavelength division multiplexer and pumps fine input terminal, and the output end of photo-coupler is by mode locking pulse output cavity
Outside；
The harmonic mode locking oscillator by control passive single-mode optical fiber length and adjust embedded Polarization Controller pressure and
It rotates angle and realizes stable mode-locking pulse output, increase pumping injecting power and realize the output of multiple-pulse stable mode-locking, and pulse weight
Frequency is adjustable between 10MHz -100MHz；
Single mode prime amplifier is partly led comprising second signal optoisolator, third optical fibre wavelength division multiplexer, third gain fibre, third
Body pump laser；The output end of first photo-coupler or the second photo-coupler connects the input of second signal optoisolator
End, second signal optical connector output end connect third optical fibre wavelength division multiplexer signal end, and third semiconductor pump laser is defeated
Outlet connects third optical fibre wavelength division multiplexer and pumps fine input terminal, and third optical fibre wavelength division multiplexer common end connects third gain light
Fine input terminal；
First gain fibre, the second gain fibre, third gain fibre are polarization-maintaining doped single mould gain fibre or non-polarization-maintaining
Doped single mould gain fibre.
3. tens of megahertzs of one kind according to claim 1 Gao Zhongying nanosecond full optical fiber laser amplifier, it is characterised in that:
The fiber stretcher (2) is made of Dispersive Devices, the second optical fiber circulator, signal light reflecting device；
The Dispersive Devices are one of high dispersion single-mode optical fiber and chirped fiber grating or a variety of；The high dispersion single mode light
Fibre is the high dispersion single-mode optical fiber of polarization-maintaining or the high dispersion single-mode optical fiber of non-polarization-maintaining；The high dispersion single-mode optical fiber abbe number D be-
114.7ps/nm/km ﹤ D ﹤ -39ps/nm/km；
The signal light reflecting device is one of fiber grating, semiconductor saturable absorber, total reflective mirror；
Third gain fibre output end connects the second optical fiber circulator input terminal, and the second optical fiber circulator reflection end connects dispersor
Part input terminal, Dispersive Devices output end connection signal light reflecting device input terminal.
4. tens of megahertzs of one kind according to claim 1 Gao Zhongying nanosecond full optical fiber laser amplifier, it is characterised in that:
The fiber optic power amplifier (3) is made of 3-stage optical fiber amplifier cascade, and wherein first order fiber amplifier includes the 4th half
Conductor pump laser, the 4th optical fibre wavelength division multiplexer, the 4th gain fibre, bandpass filter, third signal optoisolator；The
Second level fiber amplifier includes the 5th semiconductor pump laser, the first optical-fiber bundling device, the 5th gain fibre, fourth signal light
Isolator；Third level fiber amplifier includes the 6th semiconductor pump laser, the second optical-fiber bundling device, the 6th gain fibre；
Second optical fiber circulator output end connects the 4th optical fibre wavelength division multiplexer signal end, the connection of the 4th semiconductor pump laser
4th optical fibre wavelength division multiplexer pumping end, the 4th gain fibre input terminal of the 4th optical fibre wavelength division multiplexer common end connection, the 4th
Gain fibre output end connects bandpass filter input terminal, and bandpass filter output end connects the input of third signal optoisolator
End；Third signal optoisolator output end connects the first optical-fiber bundling device input terminal, the 5th semiconductor pump laser output end
The first optical-fiber bundling device pumping end is connected, the first optical-fiber bundling device output end connects the 5th gain fibre input terminal, the 5th gain
Fiber-optic output connects fourth signal optoisolator input terminal；Fourth signal optoisolator output end connects the second optical-fiber bundling device
Input terminal, the 6th semiconductor pump laser output end connect the second optical-fiber bundling device and pump end, the output of the second optical-fiber bundling device
The 6th gain fibre input terminal of end connection；
4th gain fibre and the 5th gain fibre are doped single mould gain fibre, the doping double-cladding of polarization-maintaining or non-polarization-maintaining
One of gain fibre, photonic crystal fiber are a variety of.
5. tens of megahertzs of one kind according to claim 1 Gao Zhongying nanosecond full optical fiber laser amplifier, it is characterised in that:
6th gain fibre is highly doped large mode field doubly clad optical fiber and large mode field double clad the doping photon of polarization-maintaining or non-polarization-maintaining
One of crystal optical fibre is a variety of, and is all made of all-fiber welding with the second optical-fiber bundling device output end.
6. tens of megahertzs of one kind according to claim 1 Gao Zhongying nanosecond full optical fiber laser amplifier, it is characterised in that:
The gain fibre is the optical fiber mixed with rare earth element, and rare earth element can be one of erbium, ytterbium, thulium or a variety of.
7. tens of megahertzs of one kind according to claim 1 Gao Zhongying nanosecond full optical fiber laser amplifier, it is characterised in that:
The signal light output system (4) includes cladding light device for stripping and end cap output device, and successively welding is put in optical fiber power
The output end of big device.
8. tens of megahertzs of one kind according to claim 1 Gao Zhongying nanosecond full optical fiber laser amplifier, it is characterised in that:
A kind of tens of megahertzs of Gao Zhongying nanosecond full optical fiber laser amplifiers are full polarization fibre laser amplifier or non-polarization-maintaining
Optical fiber laser amplifier.
9. tens of megahertzs of one kind according to claim 1 Gao Zhongying nanosecond full optical fiber laser amplifier, it is characterised in that:
The cladding pumping absorption coefficient of the highly doped large mode field doubly clad optical fiber is 14.0-20.0dB/m, and far field mode field diameter is
22.0—25.0μm；
The far field mode field diameter of the large mode field double clad doped photon crystal optical fiber is 20.0-40.0 μm.
10. tens of megahertzs of one kind according to claim 1 Gao Zhongying nanosecond full optical fiber laser amplifier, feature exist
In: described tens of megahertzs are 10MHz -100MHz, and the nanosecond order pulse is 1ns -10ns.
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| CN112570897A (en) * | 2020-11-17 | 2021-03-30 | 华东师范大学重庆研究院 | Femtosecond pulse cluster generation method and quartz micro-fluidic chip manufacturing device |
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| CN114430139A (en) * | 2021-12-19 | 2022-05-03 | 光惠（上海）激光科技有限公司 | Polarization-maintaining single-frequency broadening and amplifying system |
| CN117673880A (en) * | 2024-01-31 | 2024-03-08 | 北京卓镭激光技术有限公司 | Nanosecond pulse laser with double-path energy amplification |
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