CN208093940U - A kind of big energy optical fiber amplifier of the high power that repetition is tunable - Google Patents
A kind of big energy optical fiber amplifier of the high power that repetition is tunable Download PDFInfo
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- CN208093940U CN208093940U CN201820483518.9U CN201820483518U CN208093940U CN 208093940 U CN208093940 U CN 208093940U CN 201820483518 U CN201820483518 U CN 201820483518U CN 208093940 U CN208093940 U CN 208093940U
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Abstract
Include full optical fiber laser oscillator, all -fiber pulse selector, first order prime amplifier, second level prime amplifier and the third level main amplifier set gradually along light path the utility model discloses a kind of big energy optical fiber amplifier of high power that repetition is tunable；Full optical fiber laser oscillator is for generating stable seed mode-locked laser pulse, all -fiber pulse selector is used to tune the repetition rate of mode-locked laser pulse, first order prime amplifier is for generating first order pre-amplification light, second level prime amplifier generates second level pre-amplification light for amplifying first order pre-amplification light, and third level main amplifier generates the main amplification light of the third level for amplifying second level pre-amplification light.The utility model obtains high single pulse energy using all -fiber pulse selector tuning repetition rate；Realizing full fibrillation structure simultaneously makes that its is small, stability is good, final to obtain that repetition is tunable, single pulse energy is high, the output of the Ps Laser Pulse of good beam quality.
Description
Technical field
The utility model is related to laser technology fields, and in particular to a kind of big energy optical fiber of the high power that repetition is tunable is put
Big device.
Background technology
In recent years, with the development of high power optical fibre laser technology, High power ultra-short pulse optical fiber laser application range
Constantly expand, demand is growing day by day.Optical fiber laser refers to the laser using optical fiber as gain media, and Yb dosed optical fiber has energy level
Simple in structure, the advantages that gain bandwidth is wider, gradually becomes widely used a kind of gain media in high-capacity optical fiber laser.
The progress to attract people's attention that wherein picosecond Fiber laser technology obtains, becomes the reliable tools of industrial microfabrication.2016
Year, Tianjin Ao Putela laser technologies Co., Ltd used the signal source of passive mode-locking to pass through multistage highly doped polarization-maintaining Yb dosed optical fiber
7.8 micro- coke of single pulse energy, 117 watts of mean power, the laser output of repetition rate 15MHz have been finally obtained after amplification；2017
Year University Of Tianjin reports mode-locked laser pulse realizes 5.2 watts of mean power, single pulse energy 10.4 by casacade multi-amplifier
The laser of micro- coke exports.But optical fiber laser will appear nonlinear effect, optical fiber thermal damage etc. under high power, these are limited
The promotion of optical fiber laser single pulse energy influences the output performance of optical fiber laser, cannot meet laser in industrial processes, state
The demand in the fields such as anti-industry.Therefore, how to improve optical fiber laser single pulse energy and have become those skilled in the art urgently
Important topic to be solved.
Utility model content
In order to overcome the deficiencies of existing technologies, single pulse energy Upgrade Problem is solved, the utility model provides a kind of repetition
The big energy optical fiber amplifier of tunable high power.
The utility model discloses a kind of big energy optical fiber amplifiers of high power that repetition is tunable, including：Along light path according to
Full optical fiber laser oscillator, all -fiber pulse selector, first order prime amplifier, second level prime amplifier and the third of secondary setting
Grade main amplifier；
The all -fiber pulse selector includes the acousto-optic modulator being arranged along light path, and the first order prime amplifier includes
The second highly doped single-mode ytterbium-doping optical fiber, single mode optical fiber stretcher and the bandpass filter set gradually along light path, the second level
Prime amplifier includes the highly doped large mode field Double Cladding Ytterbium Doped Fiber being arranged along light path, and the third level main amplifier includes along light
The highly doped gain fibre of large mode field double clad and high-power output collimator that road is set gradually.
The full optical fiber laser oscillator includes pumping mono-mode semiconductor laser as a further improvement of the utility model,
Device and the semiconductor saturable absorber set gradually along light path, the first wavelength division multiplexer, the first highly doped single-mode ytterbium-doping light
The high anti-fiber bragg grating of fine, the first fiber coupling follower and broadband；
In Linear-Cavity, a hysteroscope of the high anti-fiber bragg grating in the broadband as resonant cavity is described partly to lead
Another hysteroscope of body saturable absorber as resonant cavity；The pumping mono-mode semiconductor laser by optical fiber pigtail with
First wavelength division multiplexer is connected, and the first fiber coupling follower is connected with the acousto-optic modulator.
The full optical fiber laser oscillator is inhaled for non-polarization-maintaining semiconductor saturable as a further improvement of the utility model,
Acceptor laser oscillator or polarization-maintaining semiconductor saturable absorber laser oscillator.
The all -fiber pulse selector further includes the isolation of the first high power light as a further improvement of the utility model,
Device；
The first high power light isolator is placed in the light between the acousto-optic modulator and the first order prime amplifier
On the road.
The acousto-optic modulator is non-polarization-maintaining acousto-optic modulator, polarization-maintaining acousto-optic as a further improvement of the utility model,
Modulator or electrooptic modulator.
The first order prime amplifier further includes the second wavelength division multiplexer, as a further improvement of the utility model,
Two fiber coupling followers and the second high power light isolator；
Second wavelength division multiplexer is placed in the first high power light isolator and the second highly doped single-mode ytterbium-doping optical fiber
Between light path on, second wavelength division multiplexer is connected by optical fiber with the pumping mono-mode semiconductor laser, described
Two fiber coupling followers are placed in the light path between the single mode optical fiber stretcher and bandpass filter, the second optical fiber coupling
The light splitting output end for closing follower is connected with photoelectric probe, the second high power light isolator be placed in the bandpass filter with
In light path between the second level prime amplifier.
The described second highly doped single-mode ytterbium-doping optical fiber is single cladded-fiber, institute as a further improvement of the utility model,
It is non-polarization-maintaining single-mode fiber stretcher, polarization-maintaining single-mode fiber stretcher or chirped fiber Bragg grating to state single mode optical fiber stretcher
With the combination of circulator, the bandpass filter is the filter with non PM fiber tail optical fiber or the filter with polarization maintaining fiber pigtail
Wave device.
The second level prime amplifier further includes the first pump multimode semiconductor as a further improvement of the utility model,
Laser, the first optical-fiber bundling device and third high power light isolator；
First optical-fiber bundling device is placed in the second high power light isolator and mixes ytterbium with highly doped large mode field double clad
In light path between optical fiber, first optical-fiber bundling device passes through optical fiber and the first pump multimode semiconductor laser phase
Even, the third high power light isolator be placed in the highly doped large mode field Double Cladding Ytterbium Doped Fiber and third level main amplifier it
Between light path on.
The highly doped large mode field Double Cladding Ytterbium Doped Fiber is that non-polarization-maintaining is highly doped as a further improvement of the utility model,
Miscellaneous doubly clad optical fiber or the highly doped doubly clad optical fiber of polarization-maintaining.
The third level main amplifier further includes the second pump multimode semiconductor as a further improvement of the utility model,
Laser, third pump multimode semiconductor laser and the second optical-fiber bundling device；
Second optical-fiber bundling device is placed in the third high power light isolator and the highly doped gain of large mode field double clad
In light path between optical fiber, second optical-fiber bundling device by optical fiber respectively with the second pump multimode semiconductor laser
It is connected with third pump multimode semiconductor laser；
The highly doped gain fibre of large mode field double clad is non-polarization-maintaining double clad high doping optical fiber, polarization-maintaining double clad is highly doped
Veiling glare is fine or photonic crystal fiber, the high-power output collimator are the high-power output with large mode field doubly clad optical fiber tail optical fiber
Collimator.
The full optical fiber laser oscillator of the utility model is for generating stable seed mode-locked laser pulse, all -fiber pulse
Selector is used for the repetition rate of tunable reduction mode-locked laser pulse to obtain high single pulse energy, first order pre-amplification
Device is for amplifying the low-repetition-frequency pulse laser after all -fiber pulse selector to obtain first order pre-amplification laser, and second
Grade prime amplifier is for amplifying first order pre-amplification laser to obtain second level pre-amplification laser；Third level main amplifier is for putting
Big second level pre-amplification laser is to obtain main amplification laser.
Compared with prior art, the beneficial effects of the utility model are：
1, the utility model utilizes pulse choice technology, and the non-linear effects in controlling per first stage amplifier realize simple venation
Rush the pulse laser output of energy height, good beam quality；
2, the utility model realizes full fibrillation, have it is compact-sized, integrated level is high, stability is good, high conversion efficiency with
And the advantages that good beam quality, it is more conducive to the construction of large laser system；
3, the utility model realizes that repetition is adjustable, realizes that pulsewidth can by single mode optical fiber stretcher by acousto-optic modulator
It adjusts, exports the big energy pulse laser output of high power of tunable single pulse energy, can play a role in different field；
4, the utility model is based on all optical fibre structure, insensitive to disturbing factors such as vibrations in working environment, significantly
The stability and reliability of laser operation are improved, industrial volume production is suitable for.
Description of the drawings
Fig. 1 is the knot of the tunable big energy optical fiber amplifier of high power of repetition disclosed in a kind of embodiment of the utility model
Structure schematic diagram；
Fig. 2 is the structural schematic diagram of full optical fiber laser oscillator in Fig. 1；
Fig. 3 is the structural schematic diagram of all -fiber pulse selector in Fig. 1；
Fig. 4 is the structural schematic diagram of first order prime amplifier in Fig. 1；
Fig. 5 is the structural schematic diagram of second level prime amplifier in Fig. 1；
Fig. 6 is the structural schematic diagram of third level main amplifier in Fig. 1.
In figure：
10, full optical fiber laser oscillator；11, pumping mono-mode semiconductor laser；12, semiconductor saturable absorber；13,
First wavelength division multiplexer；14, the first highly doped single-mode ytterbium-doping optical fiber；15, the first fiber coupling follower；16, broadband is high anti-
Fiber bragg grating；
20, all -fiber pulse selector；21, acousto-optic modulator；22, the first high power light isolator；
30, first order prime amplifier；31, the second wavelength division multiplexer；32, the second highly doped single-mode ytterbium-doping optical fiber；33, single mode
Fiber stretcher；34, the second fiber coupling follower；35, bandpass filter；36, the second high power light isolator；
40, second level prime amplifier；41, the first pump multimode semiconductor laser；42, the first optical-fiber bundling device；43, high
Adulterate large mode field Double Cladding Ytterbium Doped Fiber；44, third high power light isolator；
50, third level main amplifier；51, the second pump multimode semiconductor laser；52, third pump multimode semiconductor swashs
Light device；53, the second optical-fiber bundling device；54, the highly doped gain fibre of large mode field double clad；55, high-power output collimator.
Specific implementation mode
It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is a part of the embodiment of the utility model, instead of all the embodiments.Based on the reality in the utility model
Apply example, the every other embodiment that those of ordinary skill in the art are obtained without making creative work, all
Belong to the range of the utility model protection.
Industrial high power picosecond laser single pulse energy usually requires to reach micro- coke, or even sub- millijoule magnitude, and locks
The frequency of mould seed laser reaches MHz or more, and the single pulse energy of seed is usually nJ magnitudes, in order to obtain high pulse
Seed frequency can be reduced by pulse choice technology, then realizes high single pulse energy by high-gain amplifier by energy
Output.MHz high frequencies seed optical pulse selects kHz laser pulses by acousto-optic or electrooptic modulator, pulse using single-stage or
High single pulse energy output is realized in the amplification of person's multistage.The utility model is based on all optical fibre structure so that optical fiber laser structure
It is compacter, it is insensitive to disturbing factors such as vibrations in working environment, substantially increase laser operation stability and can
By property.High single pulse energy is obtained using all -fiber pulse selector tuning repetition rate, is swashed using the signal of passive mode-locking
Light carries out laser amplifier by casacade multi-amplifier, and final acquisition repetition is tunable, single pulse energy is high, the Gao Gong of good beam quality
The pulsed laser output of the big energy of rate.
The utility model discloses a kind of big energy optical fiber amplifiers of high power that repetition is tunable, including：Along light path according to
Full optical fiber laser oscillator, all -fiber pulse selector, first order prime amplifier, second level prime amplifier and the third of secondary setting
Grade main amplifier；All -fiber pulse selector includes the acousto-optic modulator being arranged along light path, and first order prime amplifier includes along light
The second highly doped single-mode ytterbium-doping optical fiber, single mode optical fiber stretcher and the bandpass filter that road is set gradually, second level prime amplifier
Include the highly doped large mode field Double Cladding Ytterbium Doped Fiber being arranged along light path, third level main amplifier includes being set gradually along light path
The highly doped gain fibre of large mode field double clad and high-power output collimator.
The full optical fiber laser oscillator of the utility model is for generating stable seed mode-locked laser pulse, all -fiber pulse
Selector is used for the repetition rate of tunable reduction mode-locked laser pulse to obtain high single pulse energy, first order pre-amplification
Device is for amplifying the low-repetition-frequency pulse laser after all -fiber pulse selector to obtain first order pre-amplification laser, and second
Grade prime amplifier is for amplifying first order pre-amplification laser to obtain second level pre-amplification laser；Third level main amplifier is for putting
Big second level pre-amplification laser is to obtain main amplification laser.
The utility model is further described in detail below in conjunction with the accompanying drawings：
As shown in figures 1 to 6, the utility model provides a kind of big energy optical fiber amplifier of the high power that repetition is tunable, including
The full optical fiber laser oscillator 10 that is set gradually along light path, all -fiber pulse selector 20, first order prime amplifier 30, the second level
Prime amplifier 40 and third level main amplifier 50；Wherein, full optical fiber laser oscillator 10 includes pumping mono-mode semiconductor laser
11, semiconductor saturable absorber 12, the first wavelength division multiplexer 13, the first highly doped single-mode ytterbium-doping optical fiber 14, the first optical fiber coupling
Close the high anti-fiber bragg grating 16 in follower 15 and broadband, all -fiber pulse selector 20 includes acousto-optic modulator 21 and the
One high power light isolator 22, first order prime amplifier 30 include the second wavelength division multiplexer 31, the second highly doped single-mode ytterbium-doping light
Fibre 32, single mode optical fiber stretcher 33, the second fiber coupling follower 34, bandpass filter 35 and the second high power light isolator
36, second level prime amplifier 40 includes the first pump multimode semiconductor laser 41, the first optical-fiber bundling device 42, highly doped big mould
Area double-cladding Yb dosed optical fiber 43 and third high power light isolator 44, third level main amplifier 50 are partly led including the second pump multimode
Body laser 51, third pump multimode semiconductor laser 52, the second optical-fiber bundling device 53, the highly doped gain of large mode field double clad
Optical fiber 54 and high-power output collimator 55.
Above-mentioned each building block is act as：
Full optical fiber laser oscillator 10, for generating stable seed Mode-locked laser；
Pumping mono-mode semiconductor laser 11 generates gain for pumping mono-mode Yb dosed optical fiber；
Semiconductor saturable absorber 12 is used as the hysteroscope of seed；
First wavelength division multiplexer 13 forms resonant cavity for coupling pumping light and with other devices；
First highly doped single-mode ytterbium-doping optical fiber 14, for providing gain media in oscillator；
First fiber coupling follower 15 is retained in intracavitary for part signal light and continues oscillation transmission, another part
Signal light is then coupled out；
The high anti-fiber bragg grating 16 in broadband, is used as another hysteroscope of seed Mode-locked laser, while playing wave
Long selection；
All -fiber pulse selector 20 for tunable reduces the repetition rate of oscillator to improve single pulse energy；
Acousto-optic modulator 21 improves single pulse energy for reducing the repetition rate of seed light；
First high power light isolator 22, the backward feedback light for preventing first order pre-amplification stage；
First order prime amplifier 30, for amplifying seed Mode-locked laser；
Second wavelength division multiplexer 31, for coupling pumping light and connection rear class enlarged structure；
Second highly doped single-mode ytterbium-doping optical fiber 32, for providing gain media in first order prime amplifier；
Single mode optical fiber stretcher 33, the pulsewidth for broadening seed reduce peak power；
Second fiber coupling follower 34 monitors pulse stability for beam splitting output end；
Bandpass filter 35 keeps spectrum output pure for weakening spontaneous radiation light amplification；
Second high power light isolator 36, for preventing the feedback light of second level pre-amplification to the influence of system；
Second level prime amplifier 40, the pulse laser for amplifying the generation of first order pre-amplification；
First pump multimode semiconductor laser 41, the gain fibre for pumping second level pre-amplification generate laser；
First optical-fiber bundling device 42, for connecting pump laser and signal optical fibre；
Highly doped large mode field Double Cladding Ytterbium Doped Fiber 43, for providing gain media in the prime amplifier of the second level；
Third high power light isolator 44, for preventing the feedback light of the main amplification of the third level to the damage of backing system device
Evil；
Third level main amplifier 50, the pulse laser generated for amplifying second level pre-amplification；
Second pump multimode semiconductor laser 51 generates light amplification for pumping the main gain amplifier fibre of the third level；
Third pump multimode semiconductor laser 52 generates gain for pumping the main gain amplifier optical fiber of the third level；
Second optical-fiber bundling device 53 is used for coupling pumping light and connection signal optical fiber；
The highly doped gain fibre 54 of large mode field double clad, for providing gain media in main amplifier；
High-power output collimator 55, the laser for obtaining collimated light beam export.
The connection relation of above-mentioned each building block is：
The full optical fiber laser oscillator 10 of the utility model includes the semiconductor saturable absorber set gradually along light path
12, the first wavelength division multiplexer 13, the first highly doped single-mode ytterbium-doping optical fiber 14, the first fiber coupling follower 15 and broadband are high anti-
Fiber bragg grating 16, and the pumping mono-mode semiconductor laser that is connect with the first wavelength division multiplexer 113 by optical fiber pigtail
Device 11；In Linear-Cavity, a hysteroscope of the high anti-fiber bragg grating 16 in broadband as resonant cavity, while playing wavelength choosing
It selects, another hysteroscope of semiconductor saturable absorber 12 as resonant cavity, packaged type uses all-fiber encapsulation side
Formula, and test in an experiment feasible.Pumping mono-mode semiconductor laser 11 by fibre core pump in the way of to the first highly doped list
Mould Yb dosed optical fiber 14 is pumped, and generates stable seed mode-locked laser pulse, Some seeds mode-locked laser pulse is through the first light
Fibre coupling follower 15 exports.
Further, the full optical fiber laser oscillator is non-polarization-maintaining semiconductor saturable absorber laser oscillator or polarization-maintaining
Semiconductor saturable absorber laser oscillator.
The all -fiber pulse selector 20 of the utility model includes the acousto-optic modulator 21 and first set gradually along light path
High power light isolator 22, seed Mode-locked laser drive acousto-optic tune by all -fiber pulse selector 20, with photoelectric probe
Device 21 processed reduces the repetition rate of oscillator tunablely, obtains required tunable repetition rate, obtains high single pulse energy
Amount；Pulse signal after frequency reducing enters first order prime amplifier 30, the first high power light by the first high power light isolator 22
Isolator 22 damages oscillator and pulse selector to feedback light after avoiding.
Further, acousto-optic modulator 21 can be non-polarization-maintaining acousto-optic modulator, polarization-maintaining acousto-optic modulator or electrooptic modulator.
The first order prime amplifier 30 of the utility model includes the second wavelength division multiplexer 31, second set gradually along light path
Highly doped single-mode ytterbium-doping optical fiber 32, single mode optical fiber stretcher 33, the second fiber coupling follower 34, bandpass filter 35 and second
High power light isolator 36, the second wavelength division multiplexer 31 pass through optical fiber and 11 low loss welding of pumping mono-mode semiconductor laser；
Second wavelength division multiplexer 31 carries out fibre core pumping to the second highly doped single-mode ytterbium-doping optical fiber 32, generates laser amplifier；Single mode optical fiber
Stretcher 33 is used for stretched pulse width, reduces peak power and improves the threshold value of nonlinear effect；Second fiber coupling exports
The light splitting output end of device 34 is connected with photoelectric probe, for monitoring the stability of laser backing system；Bandpass filter 35 is used
In filtering out amplified spontaneous emission, signal laser is allowed to pass through；Subsequent the second high power of welding isolator 36 with avoiding in the optical path
Reverse transfers light harmful effect caused by device and system in light path.
Further, the second highly doped single-mode ytterbium-doping optical fiber 32 is single cladded-fiber, and single mode optical fiber stretcher 33 can be non-
The combination of polarization-maintaining single-mode fiber stretcher, polarization-maintaining single-mode fiber stretcher or chirped fiber Bragg grating and circulator, band logical
Filter 35 can be the filter with non PM fiber tail optical fiber or the filter with polarization maintaining fiber pigtail.
The second level prime amplifier 40 of the utility model includes the first optical-fiber bundling device 42 set gradually along light path, highly doped
Miscellaneous large mode field Double Cladding Ytterbium Doped Fiber 43 and third high power light isolator 44, and pass through optical fiber with the first optical-fiber bundling device 42
First pump multimode semiconductor laser 41 of connection；First pump multimode semiconductor laser 41 and the first optical-fiber bundling device 42
Pumping laser, the output optical fibre tail optical fiber of the first optical-fiber bundling device 42 and highly doped large mode field double clad are inputted by optical fiber connection
43 welding of Yb dosed optical fiber generates gain and forms laser amplifier；Thereafter connection third high power light isolator 44 come after preventing to anti-
Present damage of the light to system.
Further, highly doped large mode field Double Cladding Ytterbium Doped Fiber 43 can be the highly doped doubly clad optical fiber of non-polarization-maintaining or polarization-maintaining
Highly doped doubly clad optical fiber.
The third level main amplifier 50 of the utility model includes the second optical-fiber bundling device 53, the big mould set gradually along light path
The highly doped gain fibre 54 of area double-cladding and high-power output collimator 55 and the fused fiber splice with the second optical-fiber bundling device 53
The second pump multimode semiconductor laser 51 and third pump multimode semiconductor laser 52.Second pump multimode semiconductor swashs
Light device 51 and third pump multimode semiconductor laser 52 and the second optical-fiber bundling device 53 carry out low loss fiber welding, the second light
The output signal optical fiber of fine bundling device 53 and highly doped 54 welding of gain fibre of large mode field double clad, generate the big energy of high power
Laser.To make amplification pulse laser export collimated light beam, after the highly doped gain fibre of large mode field double clad 54, welding is high-power
Output collimator 55.
Further, the highly doped gain fibre of large mode field double clad 54 can be non-polarization-maintaining double clad high doping optical fiber, polarization-maintaining
Double clad high doping optical fiber or photonic crystal fiber, high-power output collimator 55 can be band large mode field doubly clad optical fiber tail optical fiber
High-power output collimator.
The specific work process of the utility model is：
In seed linear cavity structure, pumping mono-mode semiconductor laser 11 is coupled to resonance by the first wavelength division multiplexer 13
Intracavitary pumps the first highly doped single-mode ytterbium-doping optical fiber 14, in the way of fibre core pumping in semiconductor saturable absorption
Oscillation generates mode-locked laser, wherein semiconductor saturable absorber back and forth in the high anti-fiber bragg grating 16 of body 12 and broadband
12 packaged types use all-fiber packaged type.With the first fiber coupling follower 15, a part of signal light quilt in Linear-Cavity
It is retained in intracavitary and continues oscillation transmission, another part signal light is then coupled out, and realizes stable self-locking mode operating.
The Mode-locked laser that oscillator generates carries out frequency reducing by acousto-optic modulator 21, obtains required tunable repetition
Frequency realizes that repetition rate is adjustable from MHz to KHz.Thereafter to feedback light pair after connecting the first high power light isolator 22 and preventing
The influence of system.
Signal laser after frequency reducing is entered by the second wavelength division multiplexer 31 in first order preamplifier system, pumping mono-mode half
Conductor laser 11 is coupled with the second wavelength division multiplexer 31, pumps the second highly doped single-mode ytterbium-doping optical fiber 32, is generated gain and is formed
Laser amplifier.Thereafter connection single mode optical fiber stretcher 33, the pulse width of broadened signal light, to reduce nonlinear effect and peak value
Power, while the length of stretcher is tunable, the pulse width of output is between tens picoseconds to hundred picoseconds.For monitoring laser system
The stability of system connects the second fiber coupling follower 34 in pre-amplification stage, and light splitting output end is monitored with photoelectric probe.It is defeated
The pulse laser gone out by a bandpass filter 35 come weaken the spontaneous amplification radiated noise generated in amplification process and by
Swash Raman scattering effect, weakens non-linear broadening, while also making the spectrum of output center wavelength purer.Thereafter second is connected
High power light isolator 36, the damage after preventing to feedback light to prime optical fiber amplification system.Ensureing output signal light in this way
Beam quality under the premise of, can get meet power requirement stabilization laser pulse signal.
Second level prime amplifier 40 is used as intergrade, the purpose is to improve the output power of pulse laser as far as possible, ensures
Preferable laser beam quality provides high-quality light source for main amplifier stage.First optical-fiber bundling device 42 partly leads the first pump multimode
Body laser 41 is coupled into light path, pumps highly doped large mode field Double Cladding Ytterbium Doped Fiber 43, generates laser amplifier, forms second
Grade pre-amplification light.Under different repetition rates, pump laser inputs different pumping lasers to generate different gains, ensures that master is put
Big device can obtain high-power output.Thereafter connection third high power light isolator 44, to prevent the backward feedback of main amplifier stage
Influence of the light to prime photosystem damages device.
Third level main amplifier 5, as the final output end of all -fiber pulse laser, purpose is mainly to realize signal light
High power amplifies.Using the second pump multimode semiconductor laser 51 and third pump multimode semiconductor laser 52, pump is increased
The input of Pu laser is coupled with the pumping optical fiber of the second optical-fiber bundling device 53, to the highly doped gain fibre of large mode field double clad
54 are pumped, and the pulse laser output of high power, big energy is obtained., it can be achieved that micro- coke under different repetition rates, in addition it is sub-
The output of millijoule energy.Its latter linked output end cap uses high-power output collimator 55, can bear high power parallel beam
Laser output.
For the utility model under different repetition rates, output single pulse energy is tunable, it can be achieved that micro- coke, or even sub- millijoule
The output of energy, under the conditions of different operating；This device uses non PM fiber structure, can also use polarization maintaining optical fibre device
To realize.Experimental provision has been achieved with model machineization assembling, and compact structure is compact, with compact-sized, integrated level is high, stability
The advantages that good, high conversion efficiency and good beam quality.
The preferred embodiment that these are only the utility model, is not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of big energy optical fiber amplifier of the high power that repetition is tunable, which is characterized in that including：It is set gradually along light path
Full optical fiber laser oscillator, all -fiber pulse selector, first order prime amplifier, second level prime amplifier and the main amplification of the third level
Device；
The all -fiber pulse selector includes the acousto-optic modulator being arranged along light path, and the first order prime amplifier includes along light
The second highly doped single-mode ytterbium-doping optical fiber, single mode optical fiber stretcher and bandpass filter, the second level that road is set gradually are put in advance
Big device includes the highly doped large mode field Double Cladding Ytterbium Doped Fiber being arranged along light path, the third level main amplifier include along light path according to
The highly doped gain fibre of large mode field double clad of secondary setting and high-power output collimator.
2. the big energy optical fiber amplifier of high power that repetition as described in claim 1 is tunable, which is characterized in that the full light
Fine laser oscillator includes pumping mono-mode semiconductor laser and the semiconductor saturable absorber set gradually along light path,
The high anti-optical fiber Bragg in one wavelength division multiplexer, the first highly doped single-mode ytterbium-doping optical fiber, the first fiber coupling follower and broadband
Grating；
In Linear-Cavity, a hysteroscope of the high anti-fiber bragg grating in the broadband as resonant cavity, the semiconductor can
Another hysteroscope of saturated absorbing body as resonant cavity；The pumping mono-mode semiconductor laser by optical fiber pigtail with it is described
First wavelength division multiplexer is connected, and the first fiber coupling follower is connected with the acousto-optic modulator.
3. the big energy optical fiber amplifier of high power that repetition as claimed in claim 2 is tunable, which is characterized in that the full light
Fine laser oscillator is non-polarization-maintaining semiconductor saturable absorber laser oscillator or polarization-maintaining semiconductor saturable absorber laser
Oscillator.
4. the big energy optical fiber amplifier of high power that repetition as claimed in claim 2 is tunable, which is characterized in that the full light
Fine pulse selector further includes the first high power light isolator；
The first high power light isolator is placed in the light path between the acousto-optic modulator and the first order prime amplifier.
5. the big energy optical fiber amplifier of high power that repetition as described in claim 1 or 4 is tunable, which is characterized in that described
Acousto-optic modulator is non-polarization-maintaining acousto-optic modulator, polarization-maintaining acousto-optic modulator or electrooptic modulator.
6. the big energy optical fiber amplifier of high power that repetition as claimed in claim 4 is tunable, which is characterized in that described first
Grade prime amplifier further includes the second wavelength division multiplexer, the second fiber coupling follower and the second high power light isolator；
Second wavelength division multiplexer is placed between the first high power light isolator and the second highly doped single-mode ytterbium-doping optical fiber
Light path on, second wavelength division multiplexer is connected by optical fiber with the pumping mono-mode semiconductor laser, second light
Fibre coupling follower is placed in the light path between the single mode optical fiber stretcher and bandpass filter, and second fiber coupling is defeated
The light splitting output end for going out device is connected with photoelectric probe, the second high power light isolator be placed in the bandpass filter with it is described
In light path between the prime amplifier of the second level.
7. the big energy optical fiber amplifier of high power that repetition as described in claim 1 or 6 is tunable, which is characterized in that described
Second highly doped single-mode ytterbium-doping optical fiber is single cladded-fiber, the single mode optical fiber stretcher be non-polarization-maintaining single-mode fiber stretcher,
The combination of polarization-maintaining single-mode fiber stretcher or chirped fiber Bragg grating and circulator, the bandpass filter are with non-polarization-maintaining
The filter of optical fiber pigtail or filter with polarization maintaining fiber pigtail.
8. the big energy optical fiber amplifier of high power that repetition as claimed in claim 6 is tunable, which is characterized in that described second
Grade prime amplifier further includes the first pump multimode semiconductor laser, the first optical-fiber bundling device and third high power light isolator；
First optical-fiber bundling device is placed in the second high power light isolator and highly doped large mode field Double Cladding Ytterbium Doped Fiber
Between light path on, first optical-fiber bundling device is connected by optical fiber with the first pump multimode semiconductor laser, institute
Third high power light isolator is stated to be placed between the highly doped large mode field Double Cladding Ytterbium Doped Fiber and third level main amplifier
In light path.
9. the big energy optical fiber amplifier of high power that repetition as described in claim 1 or 8 is tunable, which is characterized in that described
Highly doped large mode field Double Cladding Ytterbium Doped Fiber is the highly doped doubly clad optical fiber of non-polarization-maintaining or the highly doped doubly clad optical fiber of polarization-maintaining.
10. the big energy optical fiber amplifier of high power that repetition as claimed in claim 8 is tunable, which is characterized in that described
Three-level main amplifier further includes the second pump multimode semiconductor laser, third pump multimode semiconductor laser and the second optical fiber
Bundling device；
Second optical-fiber bundling device is placed in the third high power light isolator and the highly doped gain fibre of large mode field double clad
Between light path on, second optical-fiber bundling device by optical fiber respectively with the second pump multimode semiconductor laser and
Three pump multimode semiconductor lasers are connected；
The highly doped gain fibre of large mode field double clad is non-polarization-maintaining double clad high doping optical fiber, the highly doped veiling glare of polarization-maintaining double clad
Fine or photonic crystal fiber, the high-power output collimator are the high-power output collimation with large mode field doubly clad optical fiber tail optical fiber
Device.
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| CN112072451B (en) * | 2020-08-04 | 2022-02-01 | 华南理工大学 | 1.7 mu m all-fiber high-energy femtosecond laser system |
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