CN103166095A - All-fiber pulse laser system with visible waveband - Google Patents
All-fiber pulse laser system with visible waveband Download PDFInfo
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- CN103166095A CN103166095A CN2013100606426A CN201310060642A CN103166095A CN 103166095 A CN103166095 A CN 103166095A CN 2013100606426 A CN2013100606426 A CN 2013100606426A CN 201310060642 A CN201310060642 A CN 201310060642A CN 103166095 A CN103166095 A CN 103166095A
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Abstract
The invention discloses an all-fiber pulse laser system with a visible waveband. The all-fiber pulse laser system with the visible waveband comprises a pulse generator (100) which is used for outputting a mode-locked pulse laser. The output terminal of the pulse generator (100) is connected with a fiber pre-amplifier (200) which is used for improving the average power of the mode-locked pulse laser. The output terminal of the fiber pre-amplifier (200) is connected with a six wave mixing amplifier (300) which is used for amplifying the average power of the mode-locked pulse laser and generating nonlinear mixing. The output terminal of the six wave mixing amplifier (300) is connected with an output filter (400) which is used for conducting band-pass filtering on the mode-locked pulse laser of a required waveband and achieving collimation output. The output terminal of the output filter (400) serves as the output terminal of the all-fiber pulse laser system. The all-fiber pulse laser system with the visible waveband adopts a non-linear fiber optical frequency conversion technology, namely, a six wave mixing technology (or called a cascaded four wave mixing technology) to achieve the purposes of the adjustable wavelength of a picosecond pulse laser of the all-fiber pulse laser system, narrow linewidth, high peak value and high average power.
Description
[technical field]
The present invention relates to a kind of full fiber pulse laser system of visible waveband.
[background technology]
Nearly 2 years, the development of aerospace technology and space science has proposed more and more higher requirement to laser technology, problem demanding prompt solution is exactly to revise atmospheric turbulence effect to improve the accuracy to outer space planet and fixed star location, as the ADAPTIVE OPTICS SYSTEMS on horizontal solar telescope.But, be not to find bright enough reference location star in the sky district of target proximity to be measured, if reference location star distance target to be measured is too far away, on both direction the wavefront distortion not identical, can make the serious variation of image quality.A kind of effective solution is to use laser technology manually to produce a reference location star, is called the laser guiding.Due in the intermediate layer of earth atmosphere, highly be about 80-90km, the thin sodium atom of one deck is arranged.These sodium atoms are excited, and can launch wavelength is the sodium gold-tinted of 589nm, namely can be used as guiding.But this needs high-power, high performance LASER Light Source.
589nm sodium gold-tinted laser has wide practical use in fields such as laser radar, laser medicine, stage performance, city view, national defense and military and scientific researches except in the important application that has aspect laser sodium guiding simultaneously.General, the mode that obtains the 589nm light source mainly contains dye laser technology, Raman fiber laser technology and all solid state and three kinds of schemes of frequency laser technology.1. dye laser technology, the series of problems such as dye laser is low due to power, dye degradation, energy consumption height seldom are used.2. 1178nm Raman fiber lasers and amplifier, cavity external frequency multiplication technology in conjunction with nonlinear crystal, this scheme needs the narrow linewidth light source of 1178nm and is the pumping source of raman amplifier particular design, and outer cavity is long, laser polarization is stable and temperature control technology.Particularly the polarization state of optical-fiber laser is difficult to stable control, the non-linear frequency multiplication of 1178nm raman laser be difficult to stable and shg efficiency generally very low, for obtaining high power, whole scheme is complicated, implements difficulty in addition.3. all solid state scheme, as with the dual wavelength Nd:YAG laser of frequency 1064nm and 1319nm, be 1064nm+1319nm → 2 * 589nm, this scheme requires extremely strict to plated film, and be difficult to realize time domain coupling to control and the different wave length pulse of fundamental frequency luminous power, more than the extremely difficult average power that makes gold-tinted laser reaches 1W.Therefore, device complexity, very difficult acquisition high power or high energy, cost costliness, poor stability that above-mentioned three kinds of technical schemes are related are difficult to enter the essence application stage.
[summary of the invention]
The present invention has overcome the deficiency of above-mentioned technology, provide a kind of visible waveband narrow line width regulatable full fiber pulse laser system, by adopting the nonlinear fiber optics frequency transform techniques, namely six wave mixing technology (or being called the cascade four wave mixing technology) realize that the wavelength of system's picosecond pulse laser is adjustable, narrow linewidth, peak value and high-average power.
For achieving the above object, the present invention has adopted following technical proposal:
a kind of full fiber pulse laser system of visible waveband, include the pulse oscillator 100 for the output Mode-locked laser, the output of described pulse oscillator 100 is connected with for the predispersed fiber amplifier 200 that improves the Mode-locked laser average power, the output of described predispersed fiber amplifier 200 is connected with for Mode-locked laser being realized high-average power amplifies and produce six wave mixing amplifiers 300 of non-linear frequency mixing, six wave mixing amplifier 300 outputs are connected with for the Mode-locked laser to required wave band and carry out bandpass filtering and realize the output filter 400 that collimation is exported, the output of described output filter 400 is as the output of this system.
Described pulse oscillator 100 comprises first wave division multiplexer 102, described first wave division multiplexer 102 inputs are connected with the first semiconductor laser injection end 101, the compound output of described first wave division multiplexer 102 is connected with the input of beam splitter 104 by the first gain fibre 103, described beam splitter 104 feedback output ends are connected with the feedback input end of first wave division multiplexer 102 by saturable absorber 105, the first optical isolator 106 in turn, and described beam splitter 104 outputs are as the output of pulse oscillator 100.
Described predispersed fiber amplifier 200 comprises Second Wave division multiplexer 202, described Second Wave division multiplexer 202 1 inputs are connected with the output of pulse oscillator 100 by the second optical isolator 201, described Second Wave division multiplexer 202 another inputs are connected with the second semiconductor laser injection end 204, described Second Wave division multiplexer 202 outputs are connected with the second gain fibre 203, and the other end of described the second gain fibre 203 is as the output of predispersed fiber amplifier 200.
Described six wave mixing amplifiers 300 comprise pump combiner 302, described pump combiner 302 seed light inputs are connected with the output of predispersed fiber amplifier 200 by the 3rd optical isolator 301, the pumping input of described pump combiner 302 is connected with pumping source 304, described pump combiner 302 outputs are connected with the 3rd gain fibre 303, and described the 3rd gain fibre 303 other ends are as the output of six wave mixing amplifiers 300.
Described output filter 400 comprises band pass filter 401, the input of described band pass filter 401 is connected with the output of six wave mixing amplifiers 300, the output of described band pass filter 401 is connected with collimation follower 402, and described collimation follower 402 outputs are as 400 output of output filter.
Described pumping source 304 is at least six, and described all pumping sources 304 are connected with the pumping input of pump combiner 302.
Described the 3rd gain fibre 303 is for protecting inclined to one side double clad gain fibre, the inclined to one side double clad gain fibre of non-guarantor, helix-chiral morphology gain fibre or photonic crystal gain fibre.
The invention has the beneficial effects as follows:
1, picosecond pulse laser wavelength of the present invention has the advantages such as tunable, narrow linewidth;
2, the present invention can realize that the pulse laser high-average power amplifies and the generation of non-linear frequency mixing, and stability is high;
3, but the present invention's emission wavelength is near the yellow laser 589nm, and its breadth of spectrum line is less than 1nm;
4, the present invention can be used for a plurality of applications such as space optics adaptive calibration, laser radar, space remote sensing, astronomical observation.
[description of drawings]
Fig. 1 is the full fiber pulse laser system structural representation of visible waveband of the present invention;
Fig. 2 is the embodiment of the present invention one structural representation.
[embodiment]
Be described in further detail below in conjunction with accompanying drawing and embodiments of the present invention:
as shown in Figure 1, a kind of full fiber pulse laser system of visible waveband, include the pulse oscillator 100 for the output Mode-locked laser, the output of described pulse oscillator 100 is connected with for the predispersed fiber amplifier 200 that improves the Mode-locked laser average power, the output of described predispersed fiber amplifier 200 is connected with for Mode-locked laser being realized high-average power amplifies and produce six wave mixing amplifiers 300 of non-linear frequency mixing, six wave mixing amplifier 300 outputs are connected with the output filter 400 that carries out bandpass filtering and the output of reality collimation for the Mode-locked laser to required wave band, the output of described output filter 400 is as the output of this system.
Embodiment one:
As shown in Figure 2, described pulse oscillator 100 comprises first wave division multiplexer 102, described first wave division multiplexer 102 inputs are connected with the first semiconductor laser injection end 101, the compound output of described first wave division multiplexer 102 is connected with the input of beam splitter 104 by the first gain fibre 103, described beam splitter 104 feedback output ends are connected with the feedback input end of first wave division multiplexer 102 by saturable absorber 105, the first optical isolator 106 in turn, and described beam splitter 104 outputs are the output of pulse oscillator 100.
Described pulse oscillator 100 is Yb dosed optical fiber laser oscillators, and this oscillator can adopt the multiple locked mode modes such as saturable absorber, nonlinear polarization rotation or nonlinear loop mirror locked mode to realize the output of mode locking pulse optical-fiber laser; And can adopt standing-wave cavity or annular chamber, implement tuning by regulating in the chamber mode-lock status to output center wavelength and pulse duration.
Described predispersed fiber amplifier 200 comprises Second Wave division multiplexer 202, described Second Wave division multiplexer 202 1 inputs are connected with the output of pulse oscillator 100 by the second optical isolator 201, described Second Wave division multiplexer 202 another inputs are connected with the second semiconductor laser injection end 204, described Second Wave division multiplexer 202 outputs are connected with the second gain fibre 203, and the other end of described the second gain fibre 203 is the output of predispersed fiber amplifier 200.
Predispersed fiber amplifier 200 can be monomode fiber amplifier or double clad fiber amplifier, and purpose is the average power of pulse oscillator is promoted hundred milliwatts from several milliwatts, satisfies follow-up six wave mixing amplifiers to injecting the demand of seed light energy.
Described six wave mixing amplifiers 300 comprise pump combiner 302, described pump combiner 302 seed light inputs are connected with the output of predispersed fiber amplifier 200 by the 3rd optical isolator 301, the pumping input of described pump combiner 302 is connected with pumping source 304, described pump combiner 302 outputs are connected with the 3rd gain fibre 303, and the other end of described the 3rd gain fibre 303 is the output of six wave mixing amplifiers 300.
Described pumping source 304 is at least six, and described all the 3rd pumping sources 304 are connected with the pumping input of pump combiner 302.
Described six wave mixing amplifiers 300 are the multimode double-cladding fiber amplifier, and visible light wave range laser results from six wave mixing amplifiers 300, and described six wave mixing amplifiers 300 both can have been realized the seed light S to 200 outputs of predispersed fiber amplifier
0High-average power amplify, can realize non-linear six wave mixing signal ω simultaneously
2, ω
3And ω
4Produce.
Wherein, connect a plurality of pumping sources on pump combiner 302 inputs and realize high-average power seed light S
1Output, high-average power seed light S
1Amplification rely on the particle that adulterates in the 3rd gain fibre (as rare earth ion, the Yb of doping
3+Or Er
3+) realize, can be with high-average power seed light S
1Average power over 10 watts or higher.
The Laser output of visible waveband relies on the non-linear parameter gain of the 3rd gain fibre 303 to be achieved, high-average power seed light S
1Can produce the cascade four-wave mixing effect in the 3rd gain fibre 303.The progression of described cascade four wave mixing is along with high-average power seed light S
1Power raise and become many, namely at high-average power seed light S
1In photon ω
1After intensity is amplified to a certain threshold value, ω
1Produce the polarization of fiber medium third-order non-linear in the 3rd gain fibre 303, realize first order four wave mixing process, 2 * ω
1→ ω
2+ ω
3, ω wherein
1, ω
2And ω
3Be respectively the flashlight of high-average power seed light, first order four wave mixing generation, the ideler frequency light that first order four wave mixing produces; As high power seed photon ω
1Continue to increase, first order four wave mixing produces flashlight (parameteric light) ω of sufficient intensity
2After, ω
2Namely can be used as pump light and produce second level four wave mixing, realize second level four wave mixing process: 2 * ω
2→ ω
4+ ω
3, ω wherein
2, ω
4And ω
3Be respectively the flashlight of pump light, second level four wave mixing generation, the ideler frequency light that second level four wave mixing produces.Herein, ω
4ω
2ω
1ω
3, the ideler frequency light that the ideler frequency light that first order four wave mixing produces and second level four wave mixing produce is that ideler frequency light, i.e. ω are shared in four wave mixing
3By mathematical derivation, can be with the ideler frequency light ω in this twice four wave mixing process
3Cancellation, i.e. 2 * ω
4→ ω
2+ 2 (ω
2-ω
1), have six photon participation roles in this process, therefore be referred to as six wave mixings.ω in this process
3Loss does not by any way affect optical mixing process, by controlling ω
1, ω
2, ω
4Communication mode, ω
2And ω
4Can be from ω
1Middle acquisition gains more by force.This six wave mixings process originates from the nonlinear noise of multimode doubly clad optical fiber, and the material dispersion of the modal dispersion compensated fiber by optical fiber makes different frequency keep identical group velocity in different mode, to satisfy the required phase-matching condition of optical mixing process.
Described six wave mixing amplifiers 300 can further comprise more multistage cascade amplifying device, to obtain more high-output power; Also can comprise corresponding pulse compression device, obtain the pulse output of shorter time width; Also but chirped pulse regeneration or multi-pass amplifier are connected, and obtain more high pulse energy.
Described output filter 400 comprises band pass filter 401, the input of described band pass filter 401 is connected with the output of six wave mixing amplifiers 300, the output of described band pass filter 401 is connected with collimation follower 402, the output of described collimation follower 402 is as the output of output filter 400, in the output collimation, realize the bandpass filtering to required target wave band.
Described the 3rd gain fibre 303 is for protecting inclined to one side double clad gain fibre, the inclined to one side double clad gain fibre of non-guarantor, helix-chiral morphology gain fibre or photonic crystal gain fibre.
The full fiber pulse laser system of described visible waveband, its inner light path are optical fiber and are connected with optical fiber or with the device of coupling fiber, have guaranteed all optical fibre structure of light supply apparatus, improve the stability of a system.
The full fiber pulse laser system of a kind of visible waveband by above-mentioned proposition, this system can produce near the 589nm wave band psec or the output of femtosecond pulse.By carry out the basic frequency laser 1064nm(ω of high-average power in the yb-doped double-clad fiber of large mould field
1) when power amplification, obtain parameter laser 838nm(ω
2) and 589nm(ω
4) output.
The present embodiment adopts saturable absorber to realize the output of mode locking pulse.Wherein, the injection end of the semiconductor laser of wavelength 977nm Single-Mode Fiber Coupling centered by the first semiconductor laser injection end 101, the first wave division multiplexer 102 by 980/1064nm is coupled into ring laser; The first gain fibre 103 is for mixing the ytterbium monomode fiber; Beam splitter 104 is the beam splitter of 1064nm wave band, and splitting ratio is 30:70, and wherein 30% port is pulse oscillator 100 outputs, and 70% port is coupled in circulator; Saturated absorbing body 105 is semiconductor saturable absorbing mirror or Graphene absorber; The first optical isolator 106 is the optical isolator of the polarization irrelevant of 1064nm wave band; All device head and the tail weldings, splice loss, splice attenuation is less than 0.1dB.
The second optical isolator 201 is the optical isolator of the polarization irrelevant of 1064nm wave band; The injection end of the semiconductor laser of wavelength 977nm Single-Mode Fiber Coupling centered by the second semiconductor laser injection end 204, the Second Wave division multiplexer 202 by 980/1064nm is coupled into predispersed fiber amplifier 200; The second gain fibre 203 is for mixing ytterbium single mode or doubly clad optical fiber, and this predispersed fiber amplifier 200 can be that the laser of several milliwatts rises to hundreds of milliwatts with the average power of pulse oscillator 100 outputs.
The 3rd optical isolator 301 is the high power light isolator of the polarization irrelevant of 1064nm wave band; Pump combiner 302 is coupled into multimode yb-doped double-clad fiber the 3rd gain fibre 303 jointly with the seed light of the multichannel pump light such as six pumping sources 304 and injection, realizes that high-average power amplifies; Significant six wave mixing effect, i.e. ω can occur in the pulse laser of the 1064nm that high power amplifies in multimode yb-doped double-clad fiber the 3rd gain fibre 303
4→ ω
2+ 2 * (ω
2-ω
1), ω
4~ 589nm, ω
2~ 838nm, ω
1~ 1064nm.
Band pass filter 401 is used for the remaining 1064nm(ω of filtering
1) and parameter laser 838nm(ω
2), only allow 589nm(ω
4) pass through; Collimation follower 402 is used for 589nm(ω
4) output of optical-fiber laser collimation.
Claims (7)
1. the full fiber pulse laser system of a visible waveband, it is characterized in that: include the pulse oscillator (100) for the output Mode-locked laser, the output of described pulse oscillator (100) is connected with for the predispersed fiber amplifier (200) that improves the Mode-locked laser average power, the output of described predispersed fiber amplifier (200) is connected with for Mode-locked laser being realized high-average power amplifies and produce six wave mixing amplifiers (300) of non-linear frequency mixing, six wave mixing amplifier (300) outputs are connected with for the Mode-locked laser to required wave band and carry out bandpass filtering and realize the output filter (400) that collimation is exported, the output of described output filter (400) is as the output of this system.
2. the full fiber pulse laser system of a kind of visible waveband according to claim 1, it is characterized in that described pulse oscillator (100) comprises first wave division multiplexer (102), described first wave division multiplexer (102) input is connected with the first semiconductor laser injection end (101), the compound output of described first wave division multiplexer (102) is connected with the input of beam splitter (104) by the first gain fibre (103), described beam splitter (104) feedback output end is in turn by saturable absorber (105), the first optical isolator (106) is connected with the feedback input end of first wave division multiplexer (102), described beam splitter (104) output is as the output of pulse oscillator (100).
3. the full fiber pulse laser system of a kind of visible waveband according to claim 2, it is characterized in that described predispersed fiber amplifier (200) comprises Second Wave division multiplexer (202), described Second Wave division multiplexer (202) one inputs are connected with the output of pulse oscillator (100) by the second optical isolator (201), another input of described Second Wave division multiplexer (202) is connected with the second semiconductor laser injection end (204), described Second Wave division multiplexer (202) output is connected with the second gain fibre (203), the other end of described the second gain fibre (203) is as the output of predispersed fiber amplifier (200).
4. the full fiber pulse laser system of a kind of visible waveband according to claim 3, it is characterized in that described six wave mixing amplifiers (300) comprise pump combiner (302), described pump combiner (302) seed light input is connected with the output of predispersed fiber amplifier (200) by the 3rd optical isolator (301), the pumping input of described pump combiner (302) is connected with pumping source (304), described pump combiner (302) output is connected with the 3rd gain fibre (303), (303) other end of described the 3rd gain fibre is as the output of six wave mixing amplifiers (300).
5. the full fiber pulse laser system of a kind of visible waveband according to claim 4, it is characterized in that described output filter (400) comprises band pass filter (401), the input of described band pass filter (401) is connected with the output of six wave mixing amplifiers (300), the output of described band pass filter (401) is connected with collimation follower (402), and the output of described collimation follower (402) is as the output of output filter (400).
6. the full fiber pulse laser system of a kind of visible waveband according to claim 4, is characterized in that described pumping source (304) is at least six, and described all pumping sources (304) are connected with the pumping input of pump combiner (302).
7. the full fiber pulse laser system of a kind of visible waveband according to claim 4, is characterized in that described the 3rd gain fibre (303) is for protecting inclined to one side double clad gain fibre, the inclined to one side double clad gain fibre of non-guarantor, helix-chiral morphology gain fibre or photonic crystal gain fibre.
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| CN107045248A (en) * | 2017-06-14 | 2017-08-15 | 上海朗研光电科技有限公司 | A kind of nonlinear optical fiber amplified broad band four-wave mixing generation device |
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Application publication date: 20130619 |