CN101881919A - Optical fiber chirped pulse amplifier for ultra-short laser pulse output - Google Patents
Optical fiber chirped pulse amplifier for ultra-short laser pulse output Download PDFInfo
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Abstract
The invention discloses an optical fiber chirped pulse amplifier for ultra-short laser pulse output, which has the advantages of high pulse repetition rate, high power and ultra-short laser pulse output and belongs to the technical field of optical information. The optical fiber chirped pulse amplifier adopts an optical fiber type concave attenuating long-period fiber grating as a seed laser pulse of a high-power chirped femtosecond laser pulse amplifier or a spectral shaping component of a laser pulse amplified by a preamplifier, thereby eliminating the gain spectrum narrowing effect caused during amplification of the high-power chirped femtosecond laser pulse optical-fiber amplifier, increasing the spectral bandwidth of the amplified laser pulse. The laser pulse with smaller pulse width and higher peak power can be obtained through compression. The high-power chirped femtosecond laser pulse amplifier which has the advantages of high repetition rate, high power, simple structure and high efficiency and can be fully made of optical fiber is applicable to such industrial fields as precision machining, precision lithography, laser fusion and the like of semiconductor devices and metal materials and the basic scientific research such as biomedical imaging.
Description
Technical field
The present invention relates to a kind of fiber amplifier, be particularly related to a kind of fiber chirped pulse amplifier with high pulse repetition rate, high power, ultrashort laser pulse output, be applicable to industrial circles such as semiconductor devices, metal material Precision Machining, precision photolithography, life science technology such as biomedical imaging, accurate tooth external coat and be used for the basic scientific research field of ultrafast optics scientific experiment, the experiment of high field science and technology, laser fusion etc., genus optical information technical field.
Background technology
In recent years because femtosecond laser chirped pulse amplification [Chirped Pulses Amplification, CPA] develop rapidly and the continuous appearance of wideband gain high-quality laser medium, make the peak power of table top ultrashort laser pulse improve 6-7 the order of magnitude in recent years, thereby, scientist provides a kind of strong novel laboratory facilities for exploring natural science, and driven the formation and development of the many frontiers of physics, as laboratory astrophysics, inertial confinement fusion, A ray laser, accelerator physics, high field physics etc.Adopt this technology at present, people utilize titanium jewel gain media to produce in the laboratory laser peak power has surpassed 100TW, and the ultrashort pulse characteristic of titanium precious stone laser is combined with the high-energy characteristic of traditional nd glass laser, then can reach PW so that higher peak power.The most direct way of acquisition of common this high-peak power is to increase pumping energy, but, because this method needs higher cost, therefore by effectively shortening the pulsewidth of amplifying laser, are more cost-effective means not only, but also have advanced ultrafast characteristic many laboratories.Yet, the very short femtosecond pulse of pulsewidth also is accompanied by extremely wide bandwidth simultaneously, this wideband pulse exists complicated chromatic dispersion time-delay on the one hand in amplification process, also existing on the other hand has more serious gain narrowing effect, thereby makes the amplification pulsewidth become challenging problem less than the laser pulse of 30fs.
The develop rapidly of high power optical fibre laser technology in recent years provides new opportunity and possibility (Tino Eidam for the high power ultrashort light pulse laser technology light source that develops based on optical fiber technology, Stefan Hanf, Enrico Seise, Thomas V.Andersen, Thomas Gabler, Christian Wirth, ThomasSchreiber, Jens Limpert, and Andreas T ü nnermann, Femtosecond fiber CPAsystem emitting 830 W average output power, 94 OPTICS LETTERS/Vol.35, No.2/January 15,2010).The fiber laser of high power ultrashort pulse and amplifier are because of its unique waveguiding structure has simply, high-level efficiency, firm, light weight, integrated, high reliability, high stability.And have the Nd that mixes of broad band laser vibration recently
3+, Pr
3+, Yb
3+, Er
3+And Tm
3+The progress of fiber laser and amplifier provides and has produced the possibility of wavelength greater than the ultra-short pulse laser of 1 μ m.And mix Nd
3+, Yb
3+, Er
3+And Tm
3+Optical fiber (Tm
3+＞200nm, Er
3+＞80nm), particularly mix Tm
3+Optical fiber because of it has very wide gain bandwidth (GB), therefore, also is to produce the potential medium (M.Engelbrechtet al, Opt.Lett., Vol.33, No.7,670,2008) (Axel Ruehl et al, OSA/ASSP, WB21,2008) of femto-second laser pulse vibration).Mix Yb
3+Optical fiber has＞average power of the gain bandwidth (GB) of 100nm and high gain and output number kW level, be the generation and the amplification medium of the high power ultrashort pulse very paid attention to of present laser technology academia and industrial community, and have a large amount of bibliographical informations and commercial product to occur.
But (as mix Y owing to mix rare earth
b 3+And T
m 3+Deng) the intrinsic high gain coefficient of optical fiber, therefore utilization is mixed rare earth and (as is mixed Y
b 3+And T
m 3+Deng) the optical fiber major issue of running into as amplifier is gain narrowing effect (Gain Narrowing) (the Dimitrios N.Papadopoulos in the amplification process, MarcHanna, Fr ' ed ' eric Druon, and Patrick Georges, Compensation of GainNarrowing by Self-Phase Modulation in High-Energy Ultrafast FiberChirped-Pulse Amplifiers, 182 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUMELECTRONICS, VOL.15, NO.1, JANUARY/FEBRUARY 2009; Lyuba Kuznetsova, Andy Chong, and Frank W.Wise, Interplay of nonlinearity and gain shapingin femtosecond fiber amplifiers, 2640 OPTICS LETTERS/Vol.31, No.17/September 1,2006; Jens Limpert, Fabian R ¨ oser, Damian N.Schimpf, Enrico Seise, Tino Eidam, Steffen H ¨ adrich, Jan Rothhardt, C ' esarJauregui Misas, and Andreas T ¨ unnermann, High Repetition Rate GigawattPeak Power Fiber Laser Systems:Challenges, Design, and Experiment, IEEEJOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, VOL.15, NO.1, JANUARY/FEBRUARY 2009,159).The cause of gain narrowing effect be the spectral centroid part of femto-second laser pulse owing to the gain peak that is in amplifying fiber obtains bigger gain, and the both wing portions branch of light pulse obtains littler gain, thereby makes the optical pulse spectrum after the amplification narrow down.The existence of gain narrowing has seriously reduced through amplifying the spectral bandwidth of back Fs chirp laser pulse, thereby the width through the time domain light pulse of light pulse after the amplification is broadened, this will be compressed peak-power of laser pulse after will reducing amplification greatly, thereby reduce the performance of femtosecond optical fiber laser amplifier.The light impulse length of exporting from the locked mode femto second optical fiber laser can reach 100 femtoseconds, spectral half width can reach 30 nanometers to about 50 nanometers, and often be compressed to nanometer more than 10 even several nanometer (LyubaKuznetsova and Frank W.Wise owing to the gain narrowing effect through spectrum behind the fiber amplifier, Scaling of femtosecond Yb-doped fiberamplifiers to tens of microjoule pulse energy via nonlinear chirped pulseamplification September 15,2007/Vol.32, No.18/OPTICS LETTERS2671; ).The gain narrowing effect is the serious problems that high power femtosecond pulse chirped pulse amplifier (as solid titanium precious stone laser amplifier etc.) runs into usually.In femtosecond Solid State Laser amplifier, in order to overcome the most basic idea of gain narrowing is with the planarization of Amplifier Gain curve, usually adopt and in the chamber of regenerative amplifier, add the film etalon at amplifier gain peak value generation transmitance minimum (C.P.J.Barty, G.Korn, F.Raksi, C.Rose-Petruck, and J.Squier, A.-C.Tien, K.R.Wilson, V.V.Yakovlev, and K.Yamakawa, Regenerative pulse shaping andamplification of ultrabroadband optical pulses, February 1,1996/Vol.21, No.3/OPTICS LETTERS 219; ) or adopt spatial dispersion enlarged cavity technology (Je ' ro^me Faure, Jiro Itatani, Subrat Biswal, Gilles Che ' riaux a, Leah R.Bruner a, GlenC.Templeton a, Ge ' rard Mourou, A spatially dispersive regenerativeamplifier for ultrabroadband pulses, Optics Communications 159,1999.68-73) or adopt the seed laser pulse blue shift to overcome gain narrowing effect (J.P.Chambaret et al with the amplification long-wave seed laser pulse, Opt Lett., 21,1996,1921).
At document " the shaping seed pulse overcomes gain narrowing Study on Effect in the amplification process " (Acta Physica Sinica, Vol.49, No.6,2000,1202) in, a kind of Solid State Laser amplifier gain theoretical calculation method that spectrum finishing eliminates that narrows that is used for has been proposed, concrete computation process can be summarized as follows: in spectral bandwidth is the spectral distribution curve of seed laser pulse of 120 nanometers (full width at half maximum), introduce the seed laser pulse modulating function T that a spectral amplitudes depends on frequencies omega and control depth of modulation parameter ζ (ζ, ω):
T(ζ，ω)＝ζ-0.999Cos[15.708(χ+0.01)]
In the formula, χ=π c/50 ω, π is a circular constant, c is the light velocity in the vacuum;
Document is analyzed the solid CPA Amplification Theory that seed laser carries out reducing after the spectral modulation gain narrowing, and this notional result is some numerical simulations at the solid amplifier.
(November 10 for document " Laser pulse spectral shaping based on electro-opticmodulation ", 2008/VO1.6, No.11/CHINESE OPTICS LETTERS841) in, thereby reported that a kind of electrooptic modulator that adopts carries out the theoretical research result of study that light spectrum reshaping is eliminated the gain narrowing effect that produces in the high power Fs chirp pulse solid amplifier amplification process.U.S. Pat 2007/1003056A1 discloses a kind of ultrashort laser pulse amplifier that adopts the spatial spectral wave filter to overcome gain narrowing.In the ultrashort pulse fiber amplifier, some documents and patent have also been reported and have been adopted non-linear gain narrowing effect (Dimitrios N.Papadopoulos in phase modulation (PM) compensation amplification process in the optical fiber recently, Marc Hanna, Fr ' ed ' eric Druon, and Patrick Georges, Compensation of Gain Narrowing by Self-Phase Modulation in High-EnergyUltrafast Fiber Chirped-Pulse Amplifiers, 182 IEEE JOURNAL OF SELECTEDTOPICS IN QUANTUM ELECTRONICS, VOL.15, NO.1, JANUARY/FEBRUARY 2009; FrankW.Wise, Lyuba Kuznetsova, Chin Yu Chong, Nonlinear chirped pulse fiberamplifier with pulse compression, US Patent Application 20090002808).But existing method can only adapt to the lower femtosecond fiber amplifier of energy, to the amplification incompatibility of high-energy more (as the little Jiao Er of hundreds of to more than the milli Jiao Er) femtosecond ultrashort light pulse.The gain narrowing effect does not have good solution [Tino Eidam as yet in Bao Dao the high power ultrashort pulse optical fiber laser amplifier now, SteffenH ¨ adrich, Fabian R ¨ oser, Enrico Seise, Thomas Gottschall, JanRothhardt, Thomas Schreiber, Jens Limpert, and Andreas T ¨ unnermann A325-W-Average-Power Fiber CPA System Delivering Sub-400 fs Pulses, IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, VOL.15, NO.1, JANUARY/FEBRUARY 2009187; F.
T.Eidam, J.Rothhardt, O.Schmidt, D.N.Schimpf, J.Limpert, and A.T ü nnermann, Millijoule pulse energyhigh repetition rate femtosecond fiber chirped-pulse amplificationsystem, December 15,2007/Vol.32, No.24/OPTICS LETTERS 3495; JensLimpert, Fabian R ¨ oser, Damian N.Schimpf, Enrico Seise, Tino Eidam, Steffen H ¨ adrich, Jan Rothhardt, C ' esar Jauregui Misas, and AndreasT ¨ unnermann, High Repetition Rate Gigawatt Peak Power Fiber LaserSystems:Challenges, Design, and Experiment, IEEE JOURNAL OF SELECTEDTOPICS IN QUANTUM ELECTRONICS, VOL.15, NO.1, JANUARY/FEBRUARY, 2009,159].Amplify the gain narrowing effect that causes in order to solve Broadband Femtosecond laser pulse high-power fiber, thereby obtain the femto-second laser pulse shorter, that peak power is higher from amplifier, the narrow technology of effect of gain spectra in the high power amplification process that overcomes that presses for a kind of practicability of research and development is used for High Power Femtosecond Laser chirped pulse fiber amplifier.
Recent years, long period fiber grating was because its bandpass characteristics is used to the polarizer (Kurkov in the chamber of fiber laser, A.S., et al, " Fibre Laser with an Intracavity PolariserBased on a Long-Period Fibre Grating ", Quantum Electronics, vol.31, no.5,2001), thereby rejection filter carries out optical maser wavelength selects (Supriyo Sinha, KarelUrbanek, Jonathan Alden, Carsten Langrock, Michel J.F.Digonnet, Martin M.Fejer, and Robert L.Byer, Efficient yellow light generationby frequency doubling an 1150-nm Yb:silica fiber system, MD4
2006OSA/ASSP 2006); Reported that in 2008 the employing long period fiber grating is used for the flat-top psec and femto-second laser pulse produces (Radan Slav í k, Yongwoo Park, Jos é
Long-PeriodFiber-Grating-Based Filter for Generation of Picosecond andSubpicosecond Transform-Limited Flat-Top Pulses, 806 IEEE PHOTONICSTECHNOLOGY LETTERS, VOL.20, NO.10, MAY 15,2008).
Summary of the invention
The object of the invention provides a kind of simple in structure, is convenient to make, and has chirped ultrashort laser pulses amplifier high-repetition-rate, high power performance, full fiberize.
For achieving the above object, the technical solution used in the present invention is: a kind of fiber chirped pulse amplifier of ultrashort laser pulse output, the pumping laser light source provides pumping laser for wavelength division multiplexer or wave multiplexer, as the input pumping laser, it also comprises: adopt the long period fiber grating spectral filter of matrix decay that seed laser pulse is carried out light spectrum reshaping, as the seed laser light source of the fiber chirped pulse amplifier of ultrashort laser pulse output; Wide spectral bandwidth seed laser, optical pulse broadening device and light pulse selector switch, optical-fiber laser gain media and the laser pulse compressor reducer of locked mode;
Described optical-fiber laser gain media is single-mode fiber or big mould field single-mode fiber or a large mode area pcf of mixing rare earth;
Described wavelength division multiplexer or wave multiplexer are the signal laser/pumping laser combiner of the multiport pumping laser input of single-mode fiber or big mould field optical fiber.
The long period fiber grating spectral filter of described matrix decay, it is characterized in that: adopting single-mode fiber or big mould field optical fiber or large mode area pcf is base material, and carving the fiber chirped pulse amplifier peak gain wavelength that is decorated with ultrashort laser pulse output on it is the long period fiber grating of the matrix decay at center; The periodic function of the long period fiber grating of described matrix decay is the seed laser pulse modulating function that a kind of spectral amplitudes depends on frequencies omega and control depth of modulation parameter ζ, and its expression formula is:
T(ζ，ω)＝ζ-0.999Cos[15.708(χ+0.01)]；
In the formula: χ=π c/50 ω, π is a circular constant, c is the light velocity in the vacuum; ω is the frequency of light pulse; ζ is 1.05～1.2.
A kind of fiber chirped pulse amplifier of ultrashort laser pulse output is provided, and its concrete structure comprises:
The femto-second laser pulse of a wide-bandwidth mode-locking ultrashort pulse laser [1] output enters into the optical pulse broadening device and laser pulse selector switch [2] generation laser pulse is warbled, optical pulse time domain broadening, light pulse repetition rate reduce to obtain big amplifying laser pulse energy;
The low-repetition-frequency laser pulse of warbling is by the isolator [3] of an optical fiber coupling, the function of isolator is to isolate follow-up high-power fiber amplifier and prime femto-second laser pulse seed light source, prevents the destruction of reverse amplifying laser signal feedback to prime seed laser light-source system;
Entering one through the seed laser pulse behind the isolator, to have with high-power fiber amplifier peak gain wavelength be that the long period fiber grating spectral filter [5] of the matrix decay at center carries out light spectrum reshaping;
Seed laser pulse behind the light spectrum reshaping is connected by the low-loss welding with the signal input part optical fiber of a pumping laser with signal laser wave multiplexer [6], and the function of wave multiplexer is that pumping laser [41,42] and seed laser coupled in common are advanced in the gain fibre;
The pumping laser [41,42] of optical fiber coupling is connected by welding with the pumping laser input end fiber of wave multiplexer [6], and pumping laser enters into wave multiplexer output terminal optical fiber, and pumping laser produces the laser gain amplifier in gain fibre;
Wave multiplexer output terminal optical fiber is connected by the low-loss welding with one section gain fibre [7], and gain fibre produces laser gain at seed laser wavelength place and forms the laser amplification under the effect of pumping laser;
Second pair of pump laser [43,44] the pumping laser input end fiber with second wave multiplexer [61] is connected by welding, with pumping laser [43,44] other end from gain fibre [7] is input to the gain fibre, second pair of pump laser [43,44] thereby effect is to increase the gain that pump power improves fiber amplifier, increases the output laser power;
Export coupled lens [8] collimation coupling output through the laser pulse that the high power optical fibre laser amplifier amplifies by passing through one behind the wave multiplexer [6] again;
Parallel diffraction grating compressor reducer [11,12,9, the 10] back that amplifying laser pulse behind the collimation enters a pair of standard produces the laser pulse output of compressing.
The fiber chirped pulse amplifier of another kind of ultrashort laser pulse output is provided, and its concrete structure comprises:
The femto-second laser pulse of a wide-bandwidth mode-locking laser [1] output enters the optical pulse broadening device and laser pulse selector switch [2] generation laser pulse is warbled, optical pulse time domain broadening, and repetition frequency reduces;
The low-repetition-frequency laser pulse of warbling is by the isolator [31] of first optical fiber coupling, the function of isolator is to isolate follow-up high power amplifier and prime femto-second laser pulse seed light source, prevents the destruction of reverse amplifying laser signal to prime seed laser light-source system;
The long period fiber grating spectral filter [51] of the matrix decay that it is the center that the seed laser pulse behind the process isolator enters first fiber chirped pulse amplifier peak gain wavelength with ultrashort laser pulse output carries out light spectrum reshaping;
Seed laser pulse behind the light spectrum reshaping is connected by the low-loss welding with the signal input part optical fiber of a pumping laser/signal laser wave multiplexer [61], and the function of wave multiplexer is that pumping laser [41] and seed laser signal are coupled in the gain fibre;
The pumping laser [41] of optical fiber coupling is connected by welding with the pumping laser input end fiber of wave multiplexer, and pumping laser enters in the wave multiplexer output terminal optical fiber and produce laser gain in gain fibre;
Wave multiplexer output terminal optical fiber is connected by the low-loss welding with one section gain fibre [71], and gain fibre produces laser gain at seed laser wavelength place and forms the laser amplification under the pumping laser effect;
The input end fiber of the isolator [32] of second optical fiber coupling is connected by the low-loss welding with gain fibre [71] output terminal, and the function of isolator is to prevent the destruction of reverse amplifying laser signal to the pre-amplifier system;
The output terminal optical fiber of isolator [32] is connected by low-loss welding with the input end fiber of the long period fiber grating spectral filter [52] of second matrix decay, and the long period fiber grating spectral filter [52] that the matrix that it is the center that the light pulse by isolator [32] enters into second fiber chirped pulse amplifier peak gain wavelength of exporting with ultrashort laser pulse is decayed carries out light spectrum reshaping;
Laser pulse after the shaping enters gain fibre [72] after by wave multiplexer [62] and amplifies;
The pump laser [42,43] of optical fiber coupling is connected by welding with wave multiplexer [62] pumping laser is input to the middle generation of gain fibre [72] laser gain amplifier;
The input end fiber of isolator [33] is connected by the low-loss welding with the output terminal of gain fibre [72], and the long period fiber grating spectral filter [53] that the matrix that it is the center that the laser pulse after amplifying through second level fiber amplifier enters the 3rd the fiber chirped pulse amplifier peak gain wavelength with ultrashort laser pulse output after by isolator [33] is decayed carries out light spectrum reshaping;
The output terminal optical fiber of long period fiber grating spectral filter [53] is connected by the low-loss welding with the 3rd section gain fibre [73], and the laser pulse after the shaping enters in the gain fibre and amplifies;
The pumping laser [44,45,46,47,48,49] of optical fiber coupling and the pumping laser input end of wave multiplexer [63] are connected by welding and pumping laser are input to generation gains in the gain fibre [73];
The laser pulse that amplifies through third level fiber amplifier passes through the coupling of collimation lens [8] collimation again after by wave multiplexer [63] and exports;
Amplifying laser pulse behind the collimation enters parallel diffraction grating compressor reducer [11,12,9,10] the back output of a pair of standard.
Compared with prior art, the present invention has following characteristics:
1. adopt the light spectrum reshaping element of the long period fiber grating of optical-fiber type matrix decay as high power chirped ultrashort laser pulses amplifier seed laser pulse, be easy to be connected by fused fiber splice with front and back level high-power fiber amplifier, be easy to realize the integrated of reliable and stable full optical fiber High Power Femtosecond Laser pulse amplifier with the femtosecond laser seed light source.
2. the long period fiber grating spectral filter of full fiberize matrix decay can bear big power, both can use in pre-amplifier, also can use before back level power-type amplifier, can be in overcoming amplification process obtain high power (comprising high-average power and high-peak power) under the condition of gain narrowing and amplify output.
3. the long period fiber grating cost of optical-fiber type matrix decay is very low, and manufacture craft is simple relatively, is passive full fiber type device, does not need accurate the adjustment with complicated Circuits System to drive in the use.
4. anti-damage threshold height, device stability is good.
Description of drawings
Fig. 1 is the fiber chirped pulse Design of Amplifier principle schematic of ultrashort laser pulse output provided by the invention;
Among the figure:
The long period fiber grating transmitted spectrum that the matrix that curve (1) provides for the embodiment of the invention is decayed;
Curve (2) is the spectrum of mode-locked laser pulse (seed laser pulse of high-power fiber amplifier);
The seed laser pulse spectrum of curve (3) after for the shaping of the matrix that provides through embodiment of the invention decay long period fiber grating;
Curve (4) is the high-power fiber chirped pulse Amplifier Gain curve of spectrum of common (not adopting the gain spectra shaping);
Curve (5A) amplifies the spectrum (full width at half maximum) of back laser pulse for adopting prior art;
Curve (5B) is eliminated the spectrum (full width at half maximum) that the gain narrowing effect is amplified the back laser pulse for the long period optical fiber grating filter that the employing embodiment of the invention provides.
Fig. 2 is that the structure of the fiber chirped pulse amplifier of a kind of ultrashort laser pulse output that provides of the embodiment of the invention is formed synoptic diagram;
Fig. 3 is that the structure of the fiber chirped pulse amplifier of the another kind of ultrashort laser pulse output that provides of the embodiment of the invention is formed synoptic diagram;
Among the figure:
1, the femto-second laser pulse seed pulse light source of locked mode;
2, femto-second laser pulse stretcher and laser pulse selector switch;
3 (31,32,33), fibre optic isolater;
The semiconductor pump laser of 41 (42,43,44,45,46,47,48,49), optical fiber coupling;
The long period fiber grating spectral filter of 5 (51,52,53), the decay of different size matrix;
6 (61,62,63), pumped fiber laser wave division multiplexer or pumping laser bundling device;
7 (71,72,73), mix Y
b 3+Gain fibre;
8, laser coupled output lens;
9, plane completely reflecting mirror;
10, total reflection outgoing mirror;
11 (12), reflection or projection-type diffraction grating.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment one:
Present embodiment provides a kind of single-stage ultrashort laser pulse to mix Y
b 3+The structure of fiber chirped pulse amplifier.Adopt the light spectrum reshaping element of the long period fiber grating spectral filter of one section matrix decay as the seed laser pulse of fiber amplifier.
Its structure is:
The femto-second laser of a locked mode (as the solid state laser of locked mode or the fiber laser of locked mode) is as the seed laser light source of high power chirped pulse fiber amplifier, the spectral bandwidth of seed laser light source is 40 nanometers (full width at half maximum), centre wavelength is 1040 nanometers, the laser pulse width of output is 80 femtoseconds, the repetition rate of light pulse is 30MHz, and single pulse energy is 0.2 to receive joule; Seed laser pulse through an optical pulse broadening device (as optical fiber or grating etc.) and light pulse selector switch after, the light impulse length broadening was 1 nanosecond, repetition rate is reduced to 300kHz, supposes that the spectral bandwidth of light pulse does not have loss (spectral bandwidth keeps 40 nanometers).
The long period fiber grating that the matrix that adopts single-mode fiber to make is decayed, the periodic function of its fiber grating is the seed laser pulse modulating function that a kind of spectral amplitudes depends on frequencies omega and control depth of modulation parameter ζ, its principle is: according to the peak gain wavelength location and the gain coefficient of fiber amplifier, adopted the long period fiber grating of matrix decay that the spectrum of seed laser pulse is repaired, near the transmitance of long period fiber grating fiber amplifier peak gain wavelength reaches produces the matrix decay of certain ratio (from 3dB to 12dB), and the red end of light pulse and Lan Duan spectral position (through the optical pulse broadening device warble the back femto-second laser pulse front and back along) should reduce decay as much as possible owing to be in the low gain district of high-power fiber amplifier, the concrete attenuation ratio of the long period fiber grating of matrix decay and near the spectral width the centre wavelength obtain by numerical evaluation according to mode-locked laser pulse spectral shape and gain spectra shape and gain coefficient etc.At the spectral distribution curve of the seed laser pulse of certain bandwidth, spectral amplitudes of middle introducing depend on frequencies omega and control depth of modulation parameter ζ seed laser pulse modulating function T (ζ, ω):
T(ζ，ω)＝ζ-0.999Cos[15.708(χ+0.01)]
χ in the formula=π c/50 ω,
C is the light velocity in the vacuum, and π is a circular constant, and Cos is a surplus profound function type (cosine), and ω is the frequency of laser pulse light spectrum.
Can calculate 1020 nanometers (seed laser pulse centre wavelength is 1040 nanometers, seed laser pulse spectral bandwidth 40 nanometers (full width at half maximum)) in 1060 nanometer wavelength range thus, and adjustment curve T when depth of modulation parameter ζ gets different value (ζ, ω).
Equally, consider the seed laser pulse of pulsewidth 100 femtosecond spectral widths 40 nanometers, its spectral distribution after ovennodulation can be expressed as:
I
in′(ω)＝I
in(ω)T(ζ，ω)
I
In' (ω) be through the curve of spectrum after the modulation of matrix decay long period fiber grating, I
In(ω) be the curve of spectrum of incident seed light source seed laser pulse, (ζ ω) is the modulating function of matrix decay long period fiber grating to T.Thus can be by the seed laser pulse curve of spectrum after the modulation when different modulating depth parameter ζ.
Through the spectrum I after the seed laser pulse process high power optical fibre laser amplification after the modulation of matrix decay long period fiber grating
Out(ω) can be expressed as:
I
out’(ω)＝I
in′(ω)G(ω)
I
In' (ω) be through the curve of spectrum after the modulation of matrix decay long period fiber grating; I
Out' (ω) be the curve of spectrum through the light pulse behind the high-power fiber amplifier, G (ω)=e
GLBe to depend on the gain that the high power optical fibre laser of frequency amplifies, L is the gain length of gain fibre, and g is a gain coefficient, for HOMOGENEOUS BROADENING MEDIUM (as rare earth doped fiber):
Gain coefficient g (ω)=g
H(ω
0) * { 1/[1+4 (ω-ω
0)
2/ Δ ω
H 2
Then high-power fiber amplifier is exported I
Out' (ω) be
I
out′(ω)＝I
in(ω)G(ω)
＝I
in′(ω)G(ω)T(ζ，ω)
ω in the formula
0Be the frequency of fiber amplifier centre wavelength correspondence, ω is the frequency of centre wavelength both sides wavelength correspondence, Δ ω
HBe the frequency half width of fiber amplifier gain trace, g
H(ω
0) be fiber amplifier centre frequency ω
0The gain coefficient at place, G (ω) is for depending on the high power optical fibre laser Amplifier Gain (gain at different frequency place) of frequency.
Can calculate through the seed laser pulse after the spectral modulation again through the spectrum evolution after the high-power fiber amplifier amplification by top formula, therefore, rationally choice of modulation depth parameter ζ can be effectively against the quick growth of making centre frequency place pulsed laser energy in the high-power fiber amplifier amplification process, by will gaining, thereby realize effective control to the gain narrowing effect in the high-power fiber amplifier amplification process to the transfer on optical pulse spectrum both sides; (ζ is exactly to eliminate the design of gain narrowing effect spectral modulation device and the main theory foundation of development in the high-power fiber amplifier ω) to have the modulating function T of corresponding depth of modulation coefficient ζ (attenuation coefficient just); It also is the foundation of matrix decay long period optical fiber grating filter design and making.Laser pulse after amplifying through single-stage or multistage high power laser light amplifier is through conventional laser pulse compressor reducer (as grating pair, prism to, hollow optic fibre etc.) compression back output).
In the present embodiment, the periodic function of the long period fiber grating of the matrix decay that is provided is the seed laser pulse modulating function that a kind of spectral amplitudes depends on frequencies omega and control depth of modulation parameter ζ, and its expression formula is:
T(ζ，ω)＝ζ-0.999Cos[15.708(χ+0.01)]；
In the formula: χ=π c/50 ω, π is a circular constant, c is the light velocity in the vacuum; ω is the frequency of light pulse; ζ is 1.05～1.2.
This long period fiber grating forms the decay paddy of a 9dB in centre wavelength 1040 nanometers, with centre wavelength 1040 nanometers be the center+/-10 nanometer range form the decay (matrix decay) of surplus profound function types (Cosine), adopting single-mode fiber or big mould field optical fiber or large mode area pcf is base material, and carving the fiber chirped pulse amplifier peak gain wavelength that is decorated with ultrashort laser pulse output on it is the long period fiber grating of the matrix decay at center; This matrix decay transmission-type long period fiber grating can adopt in segmentation splicing or the optical fiber fabrication process control to fire modes such as laser power and grating cycle and realize.
Seed laser pulse forms a matrix decay in its spectral centroid wavelength 1040 nanometers after by this matrix decay long period fiber grating; High power is mixed Y
b 3+The peak gain of fiber amplifier is 23dB, its gain bandwidth (GB) (full width at half maximum) is 40 nanometers, peak gain centre wavelength is 1040 nanometers, pumping laser power is the semiconductor laser of the optical fiber coupling output of optical fiber output 50W, the pumping laser wavelength is 976 nanometers, and the gain shape of high-power fiber amplifier is Gaussian or Lorentz type; Amplify at high-power fiber amplifier through the seed laser pulse after the matrix decay long period fiber grating, because it is long that the spectral centroid place amplitude of light pulse obtains the matrix decay, the gain amplifier of its acquisition obtains restriction, and the spectrum of the long and short wavelength end of light pulse obtains bigger gain from fiber amplifier, therefore the spectral width that amplifies the back light pulse remains on about 40 nanometers, eliminated the spectrum gain narrowing effect in the high-power fiber amplifier amplification process, reduced the width of compression back laser pulse greatly, the average laser power after the amplification is 30W.
Referring to accompanying drawing 1, it is the fiber chirped pulse Design of Amplifier principle schematic of the ultrashort laser pulse output that provides of present embodiment; Among the figure, curve (1) is the transmission spectrum curve of the long period fiber grating spectral filter of a representational matrix decay, centre wavelength (typically referring to the centre wavelength of locked mode seed laser pulse spectrum or the gain peak wavelength of high-power fiber amplifier) and near, the transmissivity of long period fiber grating spectral filter is compared the decay (is the center with centre wavelength) that a matrix is arranged away from central wavelength, and the ratio of decay and bandwidth calculate according to parametric synthesis such as seed laser pulse and high power laser light Amplifier Gain coefficient, centre wavelengths; Curve (2) is the curve of spectrum of mode-locked laser pulse (seed laser pulse of high power optical fibre laser amplifier), and the relatively short second-time like flying of the laser pulse width of locked mode and spectral bandwidth are than broad (can reach tens nanometer usually); Curve (3) is the seed laser pulse of the locked mode curve of spectrum after by the long period fiber grating spectral filter of matrix decay, near the centre wavelength of mode-locked laser pulse spectrum and produced a matrix decay (can reach tens nanometer usually); Curve (4) is the gain spectra curve of a typical high-power fiber amplifier, usually the gain spectra shape of high-power fiber amplifier be a gaussian-shape or Lorenz shape (centre wavelength and near gain the highest, and very little at the both wings gain coefficient away from centre wavelength), the gain spectra bandwidth (full width at half maximum) of common high-power fiber amplifier) about more than ten nanometers; Curve (5A) is the spectrum (full width at half maximum) that a high-power fiber amplifier that does not adopt long period optical fiber grating filter to eliminate the gain narrowing effect amplifies the back laser pulse, because the inhomogeneous gain narrowing effect that causes that near gain coefficient (the gain peak wavelength reaches) that high-power fiber amplifier is high and gain spectra distribute, the spectral bandwidth that amplifies the back laser pulse narrows down; Curve (5B) is that a long period optical fiber grating filter that adopts matrix decay (is the center with centre wavelength) is eliminated the spectrum (full width at half maximum) that high-power fiber amplifier after the gain narrowing effect amplifies the back laser pulse, employing reduce high-power fiber amplifier peak gain wavelength and near after the signal amplitude (adopting the long period optical fiber grating filter of matrix decay (is the center with centre wavelength) that the spectrum amplitude of seed laser pulse is modified and shaping) of seed laser pulse eliminates the gain narrowing effect in the high-power fiber amplifier amplification process, the spectral bandwidth of the laser pulse after the amplification obtains increasing significantly, thereby the pulsewidth of laser pulse can narrow down after the subsequent compression, and the performance of high-power fiber amplifier is largely increased.This is the design concept that a long period optical fiber grating filter that adopts matrix decay (is the center with centre wavelength) is eliminated the single-stage high-power rate chirped pulse fiber amplifier of gain narrowing effect; Same design philosophy can be used in multipole high-power fiber amplifier, just the fiber size of the long period optical fiber grating filter use before each grade high-power fiber amplifier must be consistent with the optical fiber that high-power fiber amplifier uses, or adopts mould field adaptation between them.
Embodiment two:
Present embodiment provides a kind of high-repetition-rate, high power, ultrashort laser pulse to mix Y
b 3+The structure of fiber chirped pulse one-stage amplifier adopts the light spectrum reshaping element of the long period fiber grating spectral filter of one section matrix decay as the seed laser pulse of fiber amplifier, has overcome high power and has mixed Y
b 3+Gain spectra in the fiber chirped pulse amplifier amplification process effect that narrows realizes that full optical fiber high power, ultrashort laser pulse mix Y
b 3+Fiber chirped pulse is amplified.
Referring to accompanying drawing 2, it is that a kind of long period fiber grating spectral filter of one section matrix decay that adopts that this implementation column provides is mixed Y as the single-stage high-power rate of the light spectrum reshaping element of the seed laser pulse of fiber amplifier
b 3+The structural representation of fiber chirped pulse amplifier.The femtosecond seed laser pulse of locked mode is selected it after go into the long period fiber grating spectral filter of a matrix decay through optical pulse broadening device and light pulse, Filter Design is according to spectral bandwidth and the high power amplifier gain bandwidth (GB) and the gain coefficient of mode-locked laser pulse, and the seed laser pulse of process light spectrum reshaping is exported after entering and entering conventional grating pair ultrashort laser pulse compressor compresses again after the amplification in the one-level high-power fiber amplifier then.The long period fiber grating spectral filter of matrix decay is provided by the technical scheme of embodiment 1.
Its concrete annexation is: the femto-second laser pulse of mode-locked laser [1] output enters the optical pulse broadening device and laser pulse selector switch [2] generation laser pulse is warbled, optical pulse time domain broadening, and repetition frequency reduces; The low-repetition-frequency laser pulse of warbling is by the isolator [3] of an optical fiber coupling, the function of isolator is to isolate follow-up high power amplifier and prime femto-second laser pulse seed light source, prevents the destruction of reverse amplifying laser signal to prime seed laser light-source system; The long period fiber grating spectral filter [5] that enters a matrix decay through the seed laser pulse behind the isolator carries out light spectrum reshaping, near the matrix decay that the transmitance of (is 10nm (full width at half maximum) as 1060nm centre wavelength, bandwidth) produces certain ratio (from 3dB to 10dB) fiber amplifier peak gain wavelength reaches of long period fiber grating spectral filter; Seed laser pulse behind the light spectrum reshaping is connected by the low-loss welding with signal laser wave multiplexer [6] signal input part optical fiber with a pumping laser, and the function of wave multiplexer is that pumping laser [41,42] and seed laser signal are coupled in the gain fibre; The pumping laser [41,42] of optical fiber coupling is connected by welding with the pumping laser input end fiber of wave multiplexer, and pumping laser enters in the wave multiplexer output terminal optical fiber; Wave multiplexer output terminal optical fiber and one section gain fibre (as are mixed Y
b 3+) [7] by low-loss welding connection, gain fibre produces laser gain at seed laser wavelength place and forms the laser amplification under the pumping laser effect; Pumping laser [43,44] is connected by welding with the pumping laser input end fiber of second wave multiplexer [61], with pumping laser from the other end of gain fibre [7] be input to the gain fibre (with seed laser pulse in the other direction); The seed laser pulse that amplifies through the high power optical fibre laser amplifier collimates coupling output by a coupled lens [8]; Amplifying laser pulse behind the collimation enters parallel diffraction grating compressor reducer [11,12,9,10] the back output of a pair of standard.
Embodiment three: present embodiment provides a kind of three grades of ultrashort laser pulses to mix Y
b 3+The structure of fiber chirped pulse amplifier, the long period fiber grating spectral filter of three sections matrixs decay that adopts different structure as the seed laser pulse of fiber amplifier and follow-up each grade amplifier before the light spectrum reshaping element of light pulse, overcome high power and mixed Y
b 3+Gain spectra in the fiber chirped pulse amplification process effect that narrows realizes that full optical fiber high power, ultrashort laser pulse mix Y
b 3+Fiber chirped pulse is amplified.
Referring to accompanying drawing 3, it is that the structure of the fiber chirped pulse amplifier of a kind of ultrashort laser pulse output that provides of present embodiment is formed synoptic diagram.Can see that by Fig. 3 its concrete annexation is: the femto-second laser pulse of mode-locked laser [1] output enters the optical pulse broadening device and laser pulse selector switch [2] generation laser pulse is warbled, optical pulse time domain broadening, and repetition frequency reduces; The low-repetition-frequency laser pulse of warbling is by the isolator [31] of first optical fiber coupling, the function of isolator is to isolate follow-up high power amplifier and prime femto-second laser pulse seed light source, prevents the destruction of reverse amplifying laser signal to prime seed laser light-source system; The long period fiber grating spectral filter [51] that enters first matrix decay through the seed laser pulse behind the isolator carries out light spectrum reshaping, near the matrix decay that the transmitance of (is 10nm (full width at half maximum) as 1060nm centre wavelength, bandwidth) produces the transmitance of certain ratio (from 3dB to 10dB) fiber amplifier peak gain wavelength reaches of long period fiber grating spectral filter; Seed laser pulse behind the light spectrum reshaping is connected by the low-loss welding with the signal input part optical fiber of a pumping laser with signal laser wave multiplexer [61], and the function of wave multiplexer is that pumping laser [41] and seed laser signal are coupled in the gain fibre; The pumping laser [41] of optical fiber coupling is connected by welding with the pumping laser input end fiber of wave multiplexer, and pumping laser enters in the wave multiplexer output terminal optical fiber; Wave multiplexer output terminal optical fiber and one section gain fibre (as are mixed Y
b 3+) [71] by low-loss welding connection, gain fibre produces laser gain at seed laser wavelength place and forms the laser amplification under the pumping laser effect; The input end fiber of the isolator [32] of second optical fiber coupling is connected by welding with gain fibre [71] output terminal; The long period fiber grating spectral filter [52] that light pulse by isolator [32] enters second matrix decay again carries out light spectrum reshaping; Laser pulse after the shaping enters gain fibre [72] after by wave multiplexer [62] and amplifies; The pump laser [42,43] of optical fiber coupling and wave multiplexer [62] are connected by welding and pumping laser are input to generation gains in the gain fibre [72]; Laser pulse after amplifying through second level fiber amplifier enters the long period fiber grating spectral filter [53] that the 3rd matrix decay after by isolator [33] and carries out light spectrum reshaping; The output terminal optical fiber of long period fiber grating spectral filter [53] and the 3rd section gain fibre (as are mixed Y
b 3+) by low-loss welding connection, the laser pulse after the shaping enters in the gain fibre and amplifies [73]; The pumping laser [44,45,46,47,48,49] of optical fiber coupling and the pumping laser input end of wave multiplexer [63] are connected by welding and pumping laser are input to generation gains in the gain fibre [73]; The laser pulse that amplifies through third level fiber amplifier collimates coupling output through collimation lens [8]; Amplifying laser pulse behind the collimation enters parallel diffraction grating compressor reducer [11,12,9,10] the back output of a pair of standard.
Present embodiment adopts the long period fiber grating spectral filter of three sections different structure matrix decay to mix Y as the high power of the light spectrum reshaping element of the seed laser pulse of fiber amplifier
b 3+The structural representation of fiber chirped pulse third stage amplifier.The long period fiber grating spectral filter of matrix decay is provided by the technical scheme of embodiment 1.
The femtosecond seed laser pulse of locked mode is selected it after go into the long period fiber grating spectral filter of first matrix decay through optical pulse broadening device and light pulse, Filter Design is according to spectral bandwidth and the high power amplifier gain bandwidth (GB) and the gain coefficient of mode-locked laser pulse, the seed laser pulse of process light spectrum reshaping enters then and carries out the second step light spectrum reshaping in the long period fiber grating spectral filter that enters second matrix decay in the first order high-power fiber amplifier after the amplification again, light pulse through light spectrum reshaping enters second level fiber amplifier amplification again, after the long period fiber grating spectral filter that then enters the decay of the 3rd matrix carries out for the third time light spectrum reshaping, light pulse enters in the third level high-power fiber amplifier amplifies, and exports after entering conventional grating pair ultrashort laser pulse compressor compresses then.
The invention provides and utilize the long period fiber grating spectral filter of different structure matrix decay to mix Y as the single-stage or the multistage high power of the light spectrum reshaping element of the seed laser pulse of fiber amplifier
b 3+The structure of fiber chirped pulse amplifier and design philosophy.Thereby the long period fiber grating spectral filter that adopts the matrix decay carries out light spectrum reshaping to the incident seed laser pulse have been overcome high power and has mixed Y
b 3+Gain spectra in the fiber chirped pulse amplification process effect that narrows realizes that full optical fiber high power, broadband spectral ultrashort laser pulse mix Y
b 3+Fiber chirped pulse is amplified, and obtains the compress of narrower more high-peak power.Above-mentioned design philosophy and fiber amplifier structure also can be used for the rare earth of mixing of other kind and (as mix E
r 3+, mix T
m 3+, mix N
d 3+, mix H
o 3+Deng) design of single-stage and multipole high power chirped pulse optical fiber laser amplifier, be applied to various science and field of engineering technology.
Claims (4)
1. the fiber chirped pulse amplifier of ultrashort laser pulse output, the pumping laser light source provides pumping laser for wavelength division multiplexer or wave multiplexer, as the input pumping laser, it is characterized in that it also comprises: adopt the long period fiber grating spectral filter of matrix decay that seed laser pulse is carried out light spectrum reshaping, as the seed laser light source of the fiber chirped pulse amplifier of ultrashort laser pulse output; Wide spectral bandwidth seed laser, optical pulse broadening device and light pulse selector switch, optical-fiber laser gain media and the laser pulse compressor reducer of locked mode;
Described optical-fiber laser gain media is single-mode fiber or big mould field single-mode fiber or a large mode area pcf of mixing rare earth;
Described wavelength division multiplexer or wave multiplexer are the signal laser/pumping laser combiner of the multiport pumping laser input of single-mode fiber or big mould field optical fiber.
2. the fiber chirped pulse amplifier of a kind of ultrashort laser pulse output according to claim 1, it is characterized in that: the long period fiber grating spectral filter of described matrix decay, it is characterized in that: adopting single-mode fiber or big mould field optical fiber or large mode area pcf is base material, and carving the fiber chirped pulse amplifier peak gain wavelength that is decorated with ultrashort laser pulse output on it is the long period fiber grating of the matrix decay at center; The periodic function of the long period fiber grating of described matrix decay is the seed laser pulse modulating function that a kind of spectral amplitudes depends on frequencies omega and control depth of modulation parameter ζ, and its expression formula is:
T(ζ，ω)＝ζ-0.999Cos[15.708(x+0.01)]；
In the formula: x=π c/50 ω, π is a circular constant, c is the light velocity in the vacuum; ω is the frequency of light pulse; ζ is 1.05～1.2.
3. the fiber chirped pulse amplifier of a kind of ultrashort laser pulse output according to claim 1 and 2 is characterized in that its structure comprises:
The femto-second laser pulse of a wide-bandwidth mode-locking ultrashort pulse laser [1] output enters into the optical pulse broadening device and laser pulse selector switch [2] generation laser pulse is warbled, optical pulse time domain broadening, light pulse repetition rate reduce to obtain big amplifying laser pulse energy;
The low-repetition-frequency laser pulse of warbling is by the isolator [3] of an optical fiber coupling, the function of isolator is to isolate follow-up high-power fiber amplifier and prime femto-second laser pulse seed light source, prevents the destruction of reverse amplifying laser signal feedback to prime seed laser light-source system;
Entering one through the seed laser pulse behind the isolator, to have with high-power fiber amplifier peak gain wavelength be that the long period fiber grating spectral filter [5] of the matrix decay at center carries out light spectrum reshaping;
Seed laser pulse behind the light spectrum reshaping is connected by the low-loss welding with the signal input part optical fiber of a pumping laser with signal laser wave multiplexer [6], and the function of wave multiplexer is that pumping laser [41,42] and seed laser coupled in common are advanced in the gain fibre;
The pumping laser [41,42] of optical fiber coupling is connected by welding with the pumping laser input end fiber of wave multiplexer [6], and pumping laser enters into wave multiplexer output terminal optical fiber, and pumping laser produces the laser gain amplifier in gain fibre;
Wave multiplexer output terminal optical fiber is connected by the low-loss welding with one section gain fibre [7], and gain fibre produces laser gain at seed laser wavelength place and forms the laser amplification under the effect of pumping laser;
Second pair of pump laser [43,44] the pumping laser input end fiber with second wave multiplexer [61] is connected by welding, with pumping laser [43,44] other end from gain fibre [7] is input to the gain fibre, second pair of pump laser [43,44] thereby effect is to increase the gain that pump power improves fiber amplifier, increases the output laser power;
Export coupled lens [8] collimation coupling output through the laser pulse that the high power optical fibre laser amplifier amplifies by passing through one behind the wave multiplexer [6] again;
Parallel diffraction grating compressor reducer [11,12,9, the 10] back that amplifying laser pulse behind the collimation enters a pair of standard produces the laser pulse output of compressing.
4. the fiber chirped pulse amplifier of a kind of ultrashort laser pulse output according to claim 1 and 2 is characterized in that its structure comprises:
The femto-second laser pulse of a wide-bandwidth mode-locking laser [1] output enters the optical pulse broadening device and laser pulse selector switch [2] generation laser pulse is warbled, optical pulse time domain broadening, and repetition frequency reduces;
The low-repetition-frequency laser pulse of warbling is by the isolator [31] of first optical fiber coupling, the function of isolator is to isolate follow-up high power amplifier and prime femto-second laser pulse seed light source, prevents the destruction of reverse amplifying laser signal to prime seed laser light-source system;
The long period fiber grating spectral filter [51] of the matrix decay that it is the center that the seed laser pulse behind the process isolator enters first fiber chirped pulse amplifier peak gain wavelength with ultrashort laser pulse output carries out light spectrum reshaping;
Seed laser pulse behind the light spectrum reshaping is connected by the low-loss welding with the signal input part optical fiber of a pumping laser/signal laser wave multiplexer [61], and the function of wave multiplexer is that pumping laser [41] and seed laser signal are coupled in the gain fibre;
The pumping laser [41] of optical fiber coupling is connected by welding with the pumping laser input end fiber of wave multiplexer, and pumping laser enters in the wave multiplexer output terminal optical fiber and produce laser gain in gain fibre;
Wave multiplexer output terminal optical fiber is connected by the low-loss welding with one section gain fibre [71], and gain fibre produces laser gain at seed laser wavelength place and forms the laser amplification under the pumping laser effect;
The input end fiber of the isolator [32] of second optical fiber coupling is connected by the low-loss welding with gain fibre [71] output terminal, and the function of isolator is to prevent the destruction of reverse amplifying laser signal to the pre-amplifier system;
The output terminal optical fiber of isolator [32] is connected by low-loss welding with the input end fiber of the long period fiber grating spectral filter [52] of second matrix decay, and the long period fiber grating spectral filter [52] that the matrix that it is the center that the light pulse by isolator [32] enters into second fiber chirped pulse amplifier peak gain wavelength of exporting with ultrashort laser pulse is decayed carries out light spectrum reshaping;
Laser pulse after the shaping enters gain fibre [72] after by wave multiplexer [62] and amplifies;
The pump laser [42,43] of optical fiber coupling is connected by welding with wave multiplexer [62] pumping laser is input to the middle generation of gain fibre [72] laser gain amplifier;
The input end fiber of isolator [33] is connected by the low-loss welding with the output terminal of gain fibre [72], and the long period fiber grating spectral filter [53] that the matrix that it is the center that the laser pulse after amplifying through second level fiber amplifier enters the 3rd the fiber chirped pulse amplifier peak gain wavelength with ultrashort laser pulse output after by isolator [33] is decayed carries out light spectrum reshaping;
The output terminal optical fiber of long period fiber grating spectral filter [53] is connected by the low-loss welding with the 3rd section gain fibre [73], and the laser pulse after the shaping enters in the gain fibre and amplifies;
The pumping laser [44,45,46,47,48,49] of optical fiber coupling and the pumping laser input end of wave multiplexer [63] are connected by welding and pumping laser are input to generation gains in the gain fibre [73];
The laser pulse that amplifies through third level fiber amplifier passes through the coupling of collimation lens [8] collimation again after by wave multiplexer [63] and exports;
Amplifying laser pulse behind the collimation enters parallel diffraction grating compressor reducer [11,12,9,10] the back output of a pair of standard.
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Application publication date: 20101110 |