CN103944056B - A kind of acousto-optic Q modulation pulse optical fiber of MOPA structures - Google Patents
A kind of acousto-optic Q modulation pulse optical fiber of MOPA structures Download PDFInfo
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- CN103944056B CN103944056B CN201410130282.7A CN201410130282A CN103944056B CN 103944056 B CN103944056 B CN 103944056B CN 201410130282 A CN201410130282 A CN 201410130282A CN 103944056 B CN103944056 B CN 103944056B
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Abstract
The invention discloses a kind of acousto-optic Q modulation pulse optical fiber of MOPA structures, it is made up of seed oscillation source and amplification light path；The seed oscillation source includes high reflective grid, Yb dosed optical fiber, low reflective grid, optical fiber acousto-optic modulator, pumping source and pump combiner, the amplification optical routing pre-amplification light path and two grades of amplification light path compositions, the output of seed oscillation source connects pre-amplification light path by fibre optic isolater, the output of pre-amplification light path connects two grades of amplification light paths by fibre optic isolater, and two grades of amplification optical line terminals connect output isolator.The present invention under certain pump power, make pulse width control within 70ns, pulsewidth is more stable, repetition frequency range it is wide and can continuously adjustabe, repetition frequency range it is wide reach 10kHz~800kHz.Seed oscillation source of the present invention exports average laser power only ＞ 5mW, and the pumping injecting power of seed oscillation source is less than 2W.Therefore seed oscillation source demanded power output of the present invention is low, and pumping injecting power is low.
Description
Technical field
The present invention relates to the improvement of pulse optical fiber structure, a kind of acousto-optic Q modulation pulse fiber of MOPA structures is referred specifically to
Laser, belongs to field of optical device technology.
Background technology
Acousto-optic Q modulation pulse optical fiber is mainly used in industrial marking.Its basic functional principle is by high reflective grid, mixes ytterbium
Optical fiber and low reflective grid constitute a linear resonator, and to produce laser generation, optical fiber acousto-optic modulator is located at the resonator
Inside, equivalent to one cavity dumping device, optical fiber acousto-optic modulator closing in the state of, set up in resonator very strong
Laser generation, with very high Q values.Under optical fiber acousto-optic modulator opening, the laser energy of storage is from low in resonator
Reflective grid end output, so as to realize the Q impulse output of laser.
At present, the MOPA structures that pulse optical fiber is typically made up of seed oscillation source and amplification light path, due to amplification
Light path（Fiber amplifier）The power of input signal is required, otherwise easy scaling loss device, and pulse optical fiber conduct
The used time of mark also has certain requirement to power output, and this requires seed oscillation source power output general in more than 1W, needs
Inject larger pump power（＞ 3W）.Meanwhile, in the case where pulse recurrence frequency is different, pulse width and pump power
In the presence of certain correlation, it is impossible to realize wide repetition frequency range（＞ 100kHz）Stable pulse output.
The content of the invention
For deficiencies of the prior art, it is an object of the invention to provide one kind under certain pump power, arteries and veins
Width is stable, repetition frequency range it is wide and can continuously adjustabe acousto-optic Q modulation pulse optical fiber implementation method and corresponding pulse
Optical fiber laser.
To achieve these goals, the technical solution adopted by the present invention is as follows：
A kind of acousto-optic Q modulation pulse optical fiber realizes that pulsewidth is stable, repetition frequency range is wide and continuously adjustabe method,
This pulse optical fiber is the MOPA structures being made up of seed oscillation source and amplification light path, it is characterised in that：By controlling to plant
The pumping injecting power of sub- oscillation source is less than 2W, and makes the μ s of modulated signal width ＜ 2, to realize that 10kHz~800kHz repeats frequency
The adjustable Q laser pulse output of the stabilization of rate, and pulse width control is within 70ns, seed oscillation source output average laser power
＞ 5mW；The amplification optical routing pre-amplification light path and two grades of amplification light path compositions, seed oscillation source output meet pre-amplification light path portion
Divide, the pumping injecting power ＜ 5W of pre-amplification light path part, make the average laser power ＜ 1W exported through fibre optic isolater, then will
The output of pre-amplification light path connects two grades of amplification light paths by fibre optic isolater.
A kind of acousto-optic Q modulation pulse optical fiber of MOPA structures, is made up of seed oscillation source and amplification light path；The kind
Sub- oscillation source includes high reflective grid, Yb dosed optical fiber, low reflective grid, optical fiber acousto-optic modulator, pumping source and pump combiner, optical fiber
Acousto-optic modulator is located in the linear resonator that high reflective grid, Yb dosed optical fiber and low reflective grid are constituted；The amplification optical routing
Pre-amplification light path and two grades of amplification light path compositions, the output of seed oscillation source connect pre-amplification light path by fibre optic isolater, put in advance
Big light path output connects two grades of amplification light paths by fibre optic isolater, and two grades of amplification optical line terminals connect output isolator.
The pre-amplification light path is used（1+1）× 1 pump combiner, two grades of amplifications light path is used（N+1）× 1 pumping
Bundling device, wherein N are the natural number more than or equal to 1, and the mean power of output laser is determined by pumping injecting power, it is possible to achieve
High power pulsed laser is exported.
Compared with prior art, the present invention has the advantages that：
1st, the present invention makes pulse width control within 70ns, pulsewidth is more stable, repetition rate under certain pump power
More than 100kHz, repetition frequency range it is wide and can continuously adjustabe, repetition frequency range it is wide reach 10kHz~800kHz.
2nd, prior art seed oscillation source power output is typically required in more than 1W, it is therefore desirable to inject larger pumping work(
Rate（Usual ＞ 3W）.And seed oscillation source of the present invention exports average laser power only ＞ 5mW, the pumping injection of seed oscillation source
Power is less than 2W.Therefore seed oscillation source demanded power output of the present invention is low, and pumping injecting power is low, to each of seed oscillation source
The power requirement of individual component is all very low, it is ensured that the reliable and stable operation of seed oscillation source.
Brief description of the drawings
Fig. 1-seed of the present invention oscillation source structural representation.
Fig. 2-pre-amplification of the present invention light channel structure schematic diagram.
Two grades of amplification light channel structure schematic diagrames of Fig. 3-present invention.
Fig. 4-three partially connected architectures schematic diagram of the invention.
Fig. 5-20kHz of the present invention repetition rates output pulse schematic diagram.
Fig. 6-40kHz of the present invention repetition rates output pulse schematic diagram.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Acousto-optic Q modulation pulse optical fiber of the present invention realizes that pulsewidth is stable, repetition frequency range is wide and continuously adjustabe side
Method, wherein pulse optical fiber are the MOPA structures being made up of seed oscillation source and amplification light path, by controlling seed to vibrate
The pumping injecting power in source is less than 2W, and makes the μ s of modulated signal width ＜ 2, to realize the steady of 10kHz~800kHz repetition rates
Fixed adjustable Q laser pulse output, and pulse width control is within 70ns.Because the pumping injecting power of seed oscillation source is less than
2W, now seed oscillation source output average laser power ＞ 5mW, and amplify that light path multiplication factor is limited, to realize certain work(
Rate is exported, and the power of input signal is required, i.e., can not be too small, in consideration of it, the present invention changes amplification light path by pre-amplification light
Road and two grades of amplification light path two parts compositions, wherein pre-amplification light path are used to the output of seed oscillation source being amplified to two grades of satisfaction
Amplify power requirement of the light path to input signal.That is seed oscillation source output first connects pre-amplification light path part, passes through pre-amplification light
Road makes the average laser power ＜ 1W exported through fibre optic isolater, now the pumping injecting power ＜ 5W of pre-amplification light path part,
The output of pre-amplification light path is accessed into two grades of amplification light paths by fibre optic isolater again, you can needed by two grades of amplification light paths
The power output wanted.
Therefore, for overall structure, the acousto-optic Q modulation pulse optical fiber of MOPA structures of the present invention is amplified using two-stage
Light path, total light path part is made up of three parts：Seed oscillation source（MO）, pre-amplification light path（PA1）With two grades of amplification light paths
（PA2）.
Referring to Fig. 1, the seed oscillation source is by high reflective grid, Yb dosed optical fiber, low reflective grid, optical fiber acousto-optic modulator, pump
Pu source and pump combiner are constituted, and optical fiber acousto-optic modulator is located at the line being made up of high reflective grid, Yb dosed optical fiber and low reflective grid
In shape resonator.Seed source vibration of the present invention uses relatively low pumping injecting power（＜ 2W）, the μ s' of modulated signal width ＜ 2
In the case of realize 10kHz~800kHz repetition rates stabilization adjustable Q laser pulse output, and pulse width can control
Within 70ns, average laser power ＞ 5mW are exported.As a result Fig. 5 and Fig. 6 are seen.
Referring to Fig. 2, the pre-amplification light path（PA1）It is made up of Yb dosed optical fiber, LD pumping sources and pump combiner, wherein pump
Pu bundling device is（1+1）× 1 pump combiner.The pumping injecting power ＜ 5W that pre-amplification light path part is used, it is defeated through isolator 2
The average laser power ＜ 1W gone out.
Referring to Fig. 3, two grades of amplifications light path（PA2）By Yb dosed optical fiber, some LD pumping sources, pump combiner and output
Isolator is constituted, and wherein pump combiner is（N+1）× 1 pump combiner, wherein "（N+1）" in " N " represent pumping close beam
The pumping light input end of device, "（N+1）" in " 1 " represent the signal light input end of pump combiner, " " 1 " in × 1 " is represented
The output end of pump combiner, N is the natural number more than or equal to 1, and the mean power of output laser is determined by pumping injecting power,
It can realize that high power pulsed laser is exported.
Above-mentioned three part is connected by fibre optic isolater, i.e. the output of seed oscillation source connects pre- put by fibre optic isolater 1
Big light path, pre-amplification light path output connects two grades of amplification light paths by fibre optic isolater 2, two grades of amplification optical line terminals provided with export every
From device, referring to Fig. 4.
Relative to domestic other kinds of acousto-optic Q modulation pulse optical fiber, maximum feature of the invention is pump power
Relatively low and fixed, control is very simple, and domestic other kinds of acousto-optic Q modulation pulse optical fiber will realize " certain repetition
Stable pulsewidth output in frequency range " needs different pump powers, and control is more complicated, and pump power is higher, to component
Tolerance power have higher requirement.
The above embodiment of the present invention is only example to illustrate the invention, and is not the implementation to the present invention
The restriction of mode.For those of ordinary skill in the field, other can also be made not on the basis of the above description
With the change and variation of form.Here all embodiments can not be exhaustive.It is every to belong to technical scheme
Row of the obvious changes or variations amplified out still in protection scope of the present invention.
Claims (1)
1. a kind of acousto-optic Q modulation pulse optical fiber realizes that pulsewidth is stable, repetition frequency range is wide and continuously adjustabe method, this
Pulse optical fiber is the MOPA structures being made up of seed oscillation source and amplification light path, and the seed oscillation source includes high reflective
Grid, Yb dosed optical fiber, low reflective grid, optical fiber acousto-optic modulator, pumping source and pump combiner, optical fiber acousto-optic modulator are located at by height
In the linear resonator of reflective grid, Yb dosed optical fiber and low reflective grid composition, it is characterised in that：The amplification optical routing pre-amplification light
Road and two grades of amplification light path compositions, the output of seed oscillation source connect pre-amplification light path by fibre optic isolater, and pre-amplification light path is defeated
Go out and two grades of amplification light paths are connect by fibre optic isolater, two grades of amplification optical line terminals connect output isolator；
By controlling the pumping injecting power of seed oscillation source to be less than 2W, and make the μ s of modulated signal width ＜ 2, to realize 10kHz
The adjustable Q laser pulse output of the stabilization of~800kHz repetition rates, and pulse width control is within 70ns, seed oscillation source is defeated
Go out average laser power ＞ 5mW；Wherein pre-amplification light path is used to the output of seed oscillation source being amplified to two grades of amplification light of satisfaction
Power requirement of the road to input signal；The pumping injecting power ＜ 5W of pre-amplification light path part, make what is exported through fibre optic isolater
Average laser power ＜ 1W, then by the output of pre-amplification light path by fibre optic isolater connect two grades amplification light paths；
The pre-amplification light path is used（1+1）× 1 pump combiner；Two grades of amplification optical routings Yb dosed optical fiber, some LD pumps
Pu source, pump combiner and output isolator are constituted, and wherein pump combiner is（N+1）× 1 pump combiner, wherein N are big
In the natural number equal to 1, the mean power of output laser is determined by pumping injecting power, it is possible to achieve high power pulsed laser is defeated
Go out.
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| CN104158080A (en) * | 2014-08-22 | 2014-11-19 | 穆林冉 | Fiber laser and seed source thereof |
| CN104362505A (en) * | 2014-11-19 | 2015-02-18 | 广东高聚激光有限公司 | Peak power intensifier and high peak power MOPA fiber laser |
| CN105337147B (en) | 2015-11-30 | 2016-11-16 | 深圳市创鑫激光股份有限公司 | A kind of optical fiber laser |
| CN107768973A (en) * | 2017-11-14 | 2018-03-06 | 电子科技大学 | It is a kind of can precision tuning Brillouin's multi-wavelength optical fiber laser |
| CN111162436A (en) * | 2020-01-17 | 2020-05-15 | 成都翱翔拓创光电科技合伙企业(有限合伙) | Pulse fiber laser based on side pumping technology |
| CN113725715A (en) * | 2021-09-14 | 2021-11-30 | 福建中科光汇激光科技有限公司 | Pump modulation-acousto-optic combined Q-switched oscillation stage and working method thereof |
| CN116845682A (en) * | 2023-07-07 | 2023-10-03 | 武汉光至科技有限公司 | Pulse width adjustable optical fiber laser |
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| WO2008143084A1 (en) * | 2007-05-18 | 2008-11-27 | Fujikura Ltd. | Fiber laser |
| CN103050873A (en) * | 2012-12-29 | 2013-04-17 | 山东海富光子科技股份有限公司 | High-power pulse type ytterbium-doped all-fiber laser system |
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