CN1731632A - Multi-pulse superimposing amplifier and femtosecond laser parameter chirped-pulse amplification laser - Google Patents
Multi-pulse superimposing amplifier and femtosecond laser parameter chirped-pulse amplification laser Download PDFInfo
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- CN1731632A CN1731632A CN 200510021632 CN200510021632A CN1731632A CN 1731632 A CN1731632 A CN 1731632A CN 200510021632 CN200510021632 CN 200510021632 CN 200510021632 A CN200510021632 A CN 200510021632A CN 1731632 A CN1731632 A CN 1731632A
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Abstract
Disclosed is a multi impulse-adding amplifier. Femtosecond laser parameter chirp impulse laser amplifier comprise beam divider, frequency converter, multi-pulse adding amplifier, frequency doubler, impulse stretcher, delay lines, dichroic mirror and non-linear crystal. The pumping light and light signal are generated from the same light impulse, controlling the optical path difference via delay lines and realizing full synchronizing.
Description
Technical field
The invention belongs to the ultra-short pulse laser amplification sector, particularly a kind of the ultrashort pulse string is carried out the multi-pulse superimposing amplifier of superimposed pulses and spectrum narrowing and produces the femtosecond laser parameter chirped-pulse amplification laser of chirped pulse amplifying signal light.
Background technology
High power ultra-short pulse laser has a wide range of applications in many fields such as laser medicine, high field Physical Experiment, laser accurate processing, military affairs.At present, optical parameter chirped pulse amplification (OPCPA) technology is one of main method that obtains the high power ultrashort pulse.
Chinese patent ZL 00105431.7 discloses a kind of ultrashort-pulse chirp photoparametric laser device, is made up of chirp photoparametric generator and femtosecond photoparametric amplifier; Electric light optical beam scanner, prismatic light beam deflection device, non-linear laser crystal, laser pumping light source constitute the chirp photoparametric generator; Open tubular column lens or half of post lens, non-linear laser crystal, pump light source and chirped light pulse shortener constitute the femtosecond photoparametric amplifier.The chirp photoparametric generator produces the pulse that a nanosecond that adapts with the pump light pulsewidth arrives picosecond range, and the pulse that the femtosecond photoparametric amplifier produces the chirp photoparametric generator zooms into and be compressed into the ultrashort pulse of ultra high power.Though this kind ultrashort-pulse chirp photoparametric laser device structure is simpler, can not adjusts the time span and the spectrum width of used pump light, thereby be difficult to obtain the flashlight of different physical requirements.
Publication number is that the Chinese patent application of CN 1547292A discloses a kind of ultra-short pulse laser time adaptive synchronization method and device thereof, described device comprises the flashlight laser, beam splitter, optical-electrical converter, electric signal processor, the pump light laser, the laser of flashlight laser output outputs to beam splitter as flashlight, after beam splitter carries out beam splitting to flashlight, wherein a branch of light is outputed to optical-electrical converter convert pulse electrical signal to, this pulse electrical signal amplifies through electric signal processor, shaping, frequency conversion is synthetic to wait the suitable back of handling to get to know or Q switching as the active lock that clock signal flows on the pump light laser, and the pulse laser time self adaptation that the pulse laser of pump light laser output and flashlight laser are exported is synchronous or the time difference is constant.Though this kind device has solved the stationary problem of the output pulse of different ultrashort pulse lasers device in operation process, but make pump light amplifying signal light efficiently, but still can not adjust the time span and the spectrum width of pump light, and complex structure.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of multi-pulse superimposing amplifier and femtosecond laser parameter chirped-pulse amplification laser simple in structure and that pump light is changed to the flashlight high efficiency that can obtain the arrowband flat-top pump light of different time length is provided.
Multi-pulse superimposing amplifier of the present invention comprises faraday, 45 ° of rotors, first high reflective mirror, gain media I, deielectric-coating polarizer, Pockers cell and second high reflective mirrors; Faraday and 45 ° of rotors constitute the optical switch that the ultrashort pulse string enters resonant cavity; First high reflective mirror, gain media I, deielectric-coating polarizer, Pockers cell and second high reflective mirror constitute the resonant cavity that the ultrashort light pulse string is carried out superimposed pulses and spectrum narrowing, first high reflective mirror is placed on after 45 ° of rotors, it and second high reflective mirror form two end faces of resonant cavity, gain media I, deielectric-coating polarizer, Pockers cell are between above-mentioned both ends of the surface, and position each other is adjustable.Ultrashort light pulse was ganged up after faraday and 45 ° of rotors enter resonant cavity, gain media I carries out spectrum gain narrowing to ultrashort light pulse, ultrashort light pulse string round-trip transmission superimposed pulses in resonant cavity forms square-topped pulse, derive through Pockers cell and deielectric-coating polarizer, the arrowband flat-top pump light of derivation is a kind of amplification light source of flashlight.Before pulse train injected, multi-pulse superimposing amplifier was in the low Q state in chamber, had effectively suppressed amplified spontaneous emission (ASE) to reduce noise, and after pulse train injected, multi-pulse superimposing amplifier worked in the high Q state in chamber, and the energy of pulse is effectively amplified.Long by the pulse number that control is put into wherein with the chamber of adjusting resonant cavity, can obtain required various pumping pulse time waveforms.The chamber of resonant cavity is long, i.e. distance between first high reflective mirror and second high reflective mirror, and its size postpones decision by the relative time of the pulse that participates in stack in resonant cavity.
For the spectrum that further narrows, can in the element that constitutes resonant cavity, increase etalon, etalon carries out spectral filtering to reach the purpose of the spectrum that narrows to ultrashort light pulse between two end faces of the resonant cavity of first high reflective mirror and the formation of second high reflective mirror.
In order further to amplify the stack square-topped pulse of from resonant cavity, deriving, can on the derivation light path of deielectric-coating polarizer, gain media II be set.
The spectrum gain bandwidth of above-mentioned gain media I is in inferior nm magnitude, and it amplifies peak wavelength and is complementary with the centre wavelength that enters the pulse of resonant cavity.The pass band width of above-mentioned etalon is in inferior nm magnitude, and its transmitance peak value centre wavelength is complementary with the centre wavelength that enters the pulse of resonant cavity.
Femtosecond laser parameter chirped-pulse amplification laser of the present invention is made up of multi-pulse superimposing amplifier, frequency multiplier, pulse stretcher, delay line, dichroic mirror and the nonlinear crystal of beam splitter, frequency converter, said structure; Frequency converter, multi-pulse superimposing amplifier, frequency multiplier are formed the pump light light path, and pulse stretcher is arranged on the flashlight light path.Beam splitter is λ with the centre wavelength of input
0The ultrashort pulse string to be divided into centre wavelength be λ
0Flashlight 1
1With centre wavelength be λ
0Pump light source 1
2Frequency converter will be λ from the centre wavelength of beam splitter
0Pump light source 1
2Converting centre wavelength to is λ
1The ultrashort pulse string, λ
1＞λ
0, frequency converter is made of coupler, nano-photon crystal fiber and band pass filter, and coupler is λ with centre wavelength
0Pump light source 1
2Be coupled into the nano-photon crystal fiber, produce super continuous spectrums in the nano-photon crystal fiber, band pass filter carries out light spectrum reshaping to super continuous spectrums, and obtaining centre wavelength is λ
1The ultrashort pulse string; Multi-pulse superimposing amplifier will carry out superimposed pulses and spectrum narrowing from the ultrashort pulse string of frequency converter, produce the pulse that arrowband flat-top pulsewidth reaches nanosecond order, and the centre wavelength of this pulse is λ
1Frequency multiplier will carry out doubling frequency from the pulse of multi-pulse superimposing amplifier, and the centre wavelength that is produced is λ
2Square-topped pulse be pump light, λ
2=1/2 λ
1Pulse stretcher will be λ from the centre wavelength of beam splitter
0Flashlight broadening in time domain be long chirped pulse; Delay line is arranged on flashlight light path or the pump light light path, and the optical path difference of control signal light and pump light realizes that accurate light is directly synchronous; Dichroic mirror after with the frequency multiplier frequency multiplication pump light and the flashlight behind the pulse stretcher broadening inject nonlinear crystal simultaneously, nonlinear crystal converts pump light to flashlight, output chirped pulse amplifying signal light, the spectral width of this flashlight can reach 70nm, time span be tens psecs to nanosecond, power can reach the TW magnitude.
The present invention has following beneficial effect:
1, the ultrashort pulse string shaping of multi-pulse superimposing amplifier to entering can obtain the flat-top pump light that spectrum is narrow, time span is long, and this type of pump light and flashlight inject nonlinear crystal simultaneously, can obtain high s/n ratio and high stability amplifying signal light; Enter the mutual delay in the multiple-pulse superimposer between the superimposed pulse number of multi-pulse superimposing amplifier and the pulse by control, can obtain the arrowband flat-top pump light of different time length, thereby can adapt to the amplification of the flashlight of different physical requirements, increased the flexibility that the optical parameter chirped pulse amplifies (OPCPA) system.
2, because the pump light and the flashlight of femtosecond laser parameter chirped-pulse amplification laser come from same light pulse, by controlling the optical path difference between them, can realize between them fully synchronously, this employing light is synchronous method directly, can improve the conversion efficiency of pump light to flashlight.
3, owing to be provided with multi-pulse superimposing amplifier in the femtosecond laser parameter chirped-pulse amplification laser, not only can obtain high s/n ratio and high stability amplifying signal light, and can enlarge the range of application of femtosecond laser parameter chirped-pulse amplification laser.
4, frequency converter adopts the nano-photon crystal fiber, and the threshold power that produces super continuous spectrums is very low, and the super continuous spectrums of its generation is very stable.
5, femtosecond laser parameter chirped-pulse amplification laser is simple in structure, and stable performance is easy to use.
Description of drawings
Fig. 1 is first kind of structure chart of multi-pulse superimposing amplifier of the present invention;
Fig. 2 is second kind of structure chart of multi-pulse superimposing amplifier of the present invention;
Fig. 3 is the third structure chart of multi-pulse superimposing amplifier of the present invention;
Fig. 4 is the 4th a kind of structure chart of multi-pulse superimposing amplifier of the present invention;
Fig. 5 is first kind of structured flowchart of femtosecond laser parameter chirped-pulse amplification laser of the present invention;
Fig. 6 is second kind of structured flowchart of femtosecond laser parameter chirped-pulse amplification laser of the present invention;
Fig. 7 is the third structured flowchart of femtosecond laser parameter chirped-pulse amplification laser of the present invention;
Fig. 8 is the 4th a kind of structured flowchart of femtosecond laser parameter chirped-pulse amplification laser of the present invention;
Fig. 9 is the 5th a kind of structured flowchart of femtosecond laser parameter chirped-pulse amplification laser of the present invention;
Figure 10 is the 6th a kind of structured flowchart of femtosecond laser parameter chirped-pulse amplification laser of the present invention;
Figure 11 is a kind of structure chart of frequency converter;
Figure 12 is pump light after the frequency multiplication and the flashlight behind the pulse stretcher broadening are injected nonlinear crystal by dichroic mirror a schematic diagram.
Among the figure, 1-faraday, 2-45 ° rotor, 3-high reflective mirror, 4-gain media I, 5-deielectric-coating polarizer, 6-Pockers cell, 7-high reflective mirror, 8-etalon, 9-gain media II, 10-beam splitter, 11-frequency converter, 12-multi-pulse superimposing amplifier, 13-frequency multiplier, 14-pulse stretcher, 15-delay line, 16-dichroic mirror, 17-nonlinear crystal, 18-coupler, 19-nano-photon crystal fiber, 20-band pass filter.
Embodiment
The structure of the described multi-pulse superimposing amplifier of present embodiment as shown in Figure 1, be made up of 1,45 ° of rotors of faraday 2, first high reflective mirror 3, gain media I 4, deielectric-coating polarizer 5, Pockers cell 6 and second high reflective mirror 7, above-mentioned each optical element all can be buied from market.In the above-mentioned optical element, the spectrum gain bandwidth of gain media I4 is about 0.5nm, and it amplifies peak wavelength and is complementary with the centre wavelength that enters the pulse of resonant cavity; Pockers cell 6 adopts the KDP crystal, and its λ/4 delay voltages are 700 volts.Faraday 1 and 45 ° of rotors 2 constitute the optical switch that the ultrashort pulse string enters resonant cavity, and first high reflective mirror 3, gain media I4, deielectric-coating polarizer 5, Pockers cell 6 and second high reflective mirror 7 constitute the resonant cavity that the ultrashort light pulse string is carried out superimposed pulses and spectrum narrowing; First high reflective mirror 3 is placed on after 45 ° of rotors 2, and it and second high reflective mirror 7 form two end faces of resonant cavity, and gain media I4, deielectric-coating polarizer 5, Pockers cell 6 are placed between the above-mentioned both ends of the surface successively.Ultrashort light pulse was ganged up after faraday 1 and 45 ° of rotors 2 enter resonant cavity, gain media I4 carries out spectrum gain narrowing to ultrashort light pulse, ultrashort pulse string round-trip transmission, superimposed pulses in resonant cavity form square-topped pulse, derive through Pockers cell 6 and deielectric-coating polarizer 5.
The structure of the described femtosecond laser parameter chirped-pulse amplification laser of present embodiment is made up of beam splitter 10, frequency converter 11, multi-pulse superimposing amplifier 12, frequency multiplier 13, pulse stretcher 14, delay line 15, dichroic mirror 16 and nonlinear crystal LBO 17 as shown in Figure 5; Except that frequency converter 11 and multi-pulse superimposing amplifier 12, other optics all can be buied from market; The structure of frequency converter 11 is made of coupler 18, nano-photon crystal fiber 19 and band pass filter 20 as shown in figure 11, and coupler 18 is λ with centre wavelength
0Pump light source 1
2Be coupled into nano-photon crystal fiber 19, produce super continuous spectrums in nano-photon crystal fiber 19,20 pairs of super continuous spectrums of band pass filter carry out light spectrum reshaping, and obtaining centre wavelength is λ
1The ultrashort pulse string; The structure of multi-pulse superimposing amplifier 12 as shown in Figure 1, present embodiment is described in front.Beam splitter 10 is λ with the centre wavelength of input
0The ultrashort pulse string to be divided into centre wavelength be λ
0Flashlight 1
1With centre wavelength be λ
0Pump light source 1
2, flashlight 1
1With pump light source 1
2The energy ratio be 50%: 50%, λ
0Be 800nm, pulsewidth is 50 femtoseconds, and corresponding spectral width is about 20nm, is produced by mode-locked laser; Frequency converter 11 will be λ from the centre wavelength of beam splitter
0Pump light source 1
2Converting centre wavelength to is λ
1The ultrashort pulse string, λ
1Be 1053nm; Injecting 30 centre wavelengths to multi-pulse superimposing amplifier 12 is λ
1Ultrashort pulse, the amount of mismatch in the vibration chamber of the resonant cavity of multi-pulse superimposing amplifier and mode-locked laser is adjusted into 3cm, making the time delay that superposes between the pulse train that amplifies therein is 100ps, from 30 ultrashort pulses of frequency converter through superimposed pulses and spectrum narrowing after, produce the square-topped pulse of 1.4ns, its spectrum width is 0.07nm, and centre wavelength is λ
1=1053nm; Frequency multiplier 13 will carry out doubling frequency from the pulse of multi-pulse superimposing amplifier, and the centre wavelength that is produced is λ
2Square-topped pulse be pump light, λ
2Be 527nm; Pulse stretcher 14 will be λ from the centre wavelength of beam splitter 10
0The flashlight broadening be the long chirped pulse of 1.4ns; Delay line 15 is arranged on the flashlight light path and between pulse stretcher 14 and dichroic mirror 16, by the time delay of the flashlight of pulse stretcher broadening by extended line, realizes with the accurate light of pump light directly synchronous; Dichroic mirror 16 will inject nonlinear crystal 17 simultaneously from the pump light of frequency multiplier and the flashlight of delay line; The phase-matching angle that pump light, flashlight inject nonlinear crystal LBO by dichroic mirror as shown in figure 11, γ=12.57 °, in nonlinear crystal 17, pump light converts flashlight to, output chirped pulse amplifying signal light, the spectral width of this flashlight is 20nm, time span is 1.4ns, after the compressed device compression, power reaches the TW magnitude.
In the present embodiment, all optical elements are installed on the optical adjusting frame.
The structure of the described multi-pulse superimposing amplifier of present embodiment as shown in Figure 2, difference from Example 1 is: (1) has increased etalon 8, etalon is the composed component of resonant cavity, ultrashort light pulse is carried out spectral filtering, and its pass band width is that 0.02nm, transmitance peak value centre wavelength are 1053nm.(2) etalon 8, gain media I4, Pockers cell 6 and deielectric-coating polarizer 5 are placed between two end faces of resonant cavity of first high reflective mirror 3 and 7 formation of second high reflective mirror successively.
The structure of the described femtosecond laser parameter chirped-pulse amplification laser of present embodiment as shown in Figure 6, difference from Example 1 is: (1) beam splitter 10 with the input centre wavelength be λ
0The ultrashort pulse string to be divided into centre wavelength be λ
0Flashlight 1
1With centre wavelength be λ
0 Pump light source 1
2, flashlight 1
1With pump light source 1
2The energy ratio be 70%: 30%.(2) injecting 30 centre wavelengths to multi-pulse superimposing amplifier 12 is λ
1Ultrashort pulse, the amount of mismatch in the vibration chamber of the resonant cavity of multi-pulse superimposing amplifier and mode-locked laser is adjusted into 3.6cm, making the time delay that superposes between the pulse train that amplifies therein is 120ps, from 30 ultrashort pulses of frequency converter through superimposed pulses and spectrum narrowing after, produce the square-topped pulse of 2.3ns, its spectrum width is 0.002nm, and centre wavelength is λ
1=1053nm.(3) delay line 15 is arranged on the flashlight light path and between beam splitter 10 and pulse stretcher 14; (4) centre wavelength of pulse stretcher self-dalay line in 14 future 15 is λ
0The flashlight broadening be the long chirped pulse of 2.3ns; (5) pump light, flashlight are injected phase-matching angle γ=12.57 ° of nonlinear crystal LBO by dichroic mirror, in nonlinear crystal 17, pump light converts flashlight to, output chirped pulse amplifying signal light, the spectral width of this flashlight is 20nm, time span is 2.3ns, and after the compressed device compression, power can reach the TW magnitude.
Embodiment 3
The structure of the described multi-pulse superimposing amplifier of present embodiment as shown in Figure 3, difference from Example 1 is: the derivation light path of (1) deielectric-coating polarizer 5 is provided with gain media II9, it further amplifies the stack square-topped pulse of deriving from resonant cavity, its spectrum gain bandwidth is 0.5nm.(2) deielectric-coating polarizer 5, Pockers cell 6 and gain media I4 are placed between two end faces of resonant cavity of first high reflective mirror 3 and 7 formation of second high reflective mirror successively.
The structure of the described femtosecond laser parameter chirped-pulse amplification laser of present embodiment as shown in Figure 7, difference from Example 1 is: (1) injects 30 centre wavelengths to multi-pulse superimposing amplifier 12 is λ
1Ultrashort pulse, the amount of mismatch in the vibration chamber of the resonant cavity of multi-pulse superimposing amplifier and mode-locked laser is adjusted into 3.6cm, making the time delay that superposes between the pulse train that amplifies therein is 120ps, from 30 ultrashort pulses of frequency converter through superimposed pulses and spectrum narrowing after, produce the square-topped pulse of 1.8ns, its spectrum width is 0.07nm, and centre wavelength is λ
1=1053nm.(2) delay line 15 is arranged on the pump light light path and between beam splitter 10 and frequency converter 11; (3) pulse stretcher 14 will be λ from the centre wavelength of beam splitter 10
0The flashlight broadening be the long chirped pulse of 1.8ns; (4) pump light, flashlight are injected phase-matching angle γ=11.2 ° of nonlinear crystal BBO by dichroic mirror, in nonlinear crystal 17, pump light converts flashlight to, output chirped pulse amplifying signal light, the spectrum of this flashlight is 20nm, time span is 1.8ns, and after the compressed device compression, power reaches the TW magnitude.
The structure of the described multi-pulse superimposing amplifier of present embodiment as shown in Figure 4, difference from Example 1 is: (1) has increased etalon 8, etalon is the composed component of resonant cavity, ultrashort light pulse is carried out spectral filtering, and its pass band width is that 0.03nm, transmitance peak value centre wavelength are 1053nm.(2) the derivation light path of deielectric-coating polarizer 5 is provided with gain media II9, and it further amplifies the stack square-topped pulse of deriving from resonant cavity, and its spectrum gain bandwidth is 0.5nm.(2) gain media I 4, etalon 8, deielectric-coating polarizer 5 and Pockers cell 6 are placed between two end faces of resonant cavity of first high reflective mirror 3 and 7 formation of second high reflective mirror successively.
The structure of the described femtosecond laser parameter chirped-pulse amplification laser of present embodiment as shown in Figure 8, difference from Example 1 is: (1) injects 40 centre wavelengths to multi-pulse superimposing amplifier 12 is λ
1Ultrashort pulse, the amount of mismatch in the vibration chamber of the resonant cavity of multi-pulse superimposing amplifier and mode-locked laser is adjusted into 3.6m, making the time delay that superposes between the pulse train that amplifies therein is 120ps, from 40 ultrashort pulses of frequency converter through superimposed pulses and spectrum narrowing after, produce the square-topped pulse of 4.8ns, its spectrum width is 0.006nm, and centre wavelength is λ
1=1053nm.(2) delay line 15 is arranged on the pump light light path and between frequency converter 11 and multi-pulse superimposing amplifier 12; (3) pulse stretcher 14 will be λ from the centre wavelength of beam splitter 10
0The flashlight broadening be the long chirped pulse of 1.6ns; (4) be complementary γ=11.2 °, pump light, the flashlight position of injecting nonlinear crystal BBO by dichroic mirror, in nonlinear crystal 17, pump light converts flashlight to, output chirped pulse amplifying signal light, the spectral width 20nm of this flashlight, time span is 1.6ns, and after the compressed device compression, power is up to the TW magnitude.
Embodiment 5:
The structure of the described multi-pulse superimposing amplifier of present embodiment as shown in Figure 1, and is identical with embodiment 1.
The structure of the described femtosecond laser parameter chirped-pulse amplification laser of present embodiment as shown in Figure 9, difference from Example 1 is: (1) injects 40 centre wavelengths to multi-pulse superimposing amplifier 12 is λ
1Ultrashort pulse, the amount of mismatch in the vibration chamber of the resonant cavity of multi-pulse superimposing amplifier and mode-locked laser is adjusted into 3.6cm, making the time delay that superposes between the pulse train that amplifies therein is 120ps, from 40 ultrashort pulses of frequency converter through superimposed pulses and spectrum narrowing after, generation reaches the square-topped pulse of 4.2ns, its spectrum width is 0.03nm, and centre wavelength is λ
1=1053nm.(2) delay line 15 is arranged on the pump light light path and between multi-pulse superimposing amplifier 12 and frequency multiplier 13.(3) pulse stretcher 14 will be λ from the centre wavelength of beam splitter 10
0The flashlight broadening be the long chirped pulse of 1.4ns.(4) pump light, flashlight are injected phase-matching angle γ=11.2 ° of nonlinear crystal BBO by dichroic mirror, in nonlinear crystal 17, pump light converts flashlight to, output chirped pulse amplifying signal light, this flashlight amplifies through three times, and the spectrum of this flashlight is 20nm, and time span is 1.4ns, after the compressed device compression, power can reach the TW magnitude.
The structure of the described multi-pulse superimposing amplifier of present embodiment as shown in Figure 1, and is identical with embodiment 1.
The structure of the described femtosecond laser parameter chirped-pulse amplification laser of present embodiment as shown in figure 10, difference from Example 1 is: (1) injects 50 centre wavelengths to multi-pulse superimposing amplifier 12 is λ
1Ultrashort pulse, the resonant cavity of multi-pulse superimposing amplifier and the long amount of mismatch in chamber of ultra-short pulse oscillator are adjusted into 3.6cm, making the time delay that superposes between the pulse train that amplifies therein is 120ps, from 50 ultrashort pulses of frequency converter through superimposed pulses and spectrum narrowing after, produce the square-topped pulse of 5.4ns, its spectrum width is 0.01nm, and centre wavelength is λ
1=1053nm.(2) delay line 15 is arranged on the pump light light path and between frequency multiplier 13 and dichroic mirror 16.(3) pulse stretcher 14 will be λ from the centre wavelength of beam splitter 10
0The flashlight broadening be the long chirped pulse of 1.8ns.(4) pump light, flashlight are injected phase-matching angle γ=11.2 ° of nonlinear crystal BBO by dichroic mirror, in nonlinear crystal 17, pump light converts flashlight to, output chirped pulse amplifying signal light, through after the triphasic amplification, the spectrum of this flashlight is 20nm, and time span is 1.8ns, after the compressed device compression, power can reach the TW magnitude.
Claims (10)
1, a kind of multi-pulse superimposing amplifier is characterized in that comprising faraday (1), 45 ° of rotors (2), first high reflective mirror (3), gain media I (4), deielectric-coating polarizer (5), Pockers cell (6) and second high reflective mirror (7),
Faraday (1) and 45 ° of rotors (2) constitute the optical switch that the ultrashort pulse string enters resonant cavity, first high reflective mirror (3), gain media I (4), deielectric-coating polarizer (5), Pockers cell (6) and second high reflective mirror (7) constitute the resonant cavity that the ultrashort light pulse string is carried out superimposed pulses and spectrum narrowing
First high reflective mirror (3) is placed on 45 ° of rotors (2) afterwards, and it and second high reflective mirror (7) form two end faces of resonant cavity, and gain media I (4), deielectric-coating polarizer (5), Pockers cell (6) are between above-mentioned both ends of the surface, and position each other is adjustable,
Ultrashort light pulse was ganged up after faraday (1) and 45 ° of rotors (2) enter resonant cavity, gain media I (4) carries out spectrum gain narrowing to ultrashort light pulse, ultrashort light pulse string round-trip transmission superimposed pulses in resonant cavity forms square-topped pulse, derives through Pockers cell (6) and deielectric-coating polarizer (5).
2, multi-pulse superimposing amplifier according to claim 1 is characterized in that also comprising etalon (8), and etalon is positioned between two end faces of the resonant cavity that first high reflective mirror (3) and second high reflective mirror (7) form, and ultrashort light pulse is carried out spectral filtering.
3, multi-pulse superimposing amplifier according to claim 2, the pass band width that it is characterized in that etalon (8) are in inferior nm magnitude, and its transmitance peak value centre wavelength is complementary with the centre wavelength that enters the pulse of resonant cavity.
4, according to claim 1 or 2 or 3 described multi-pulse superimposing amplifiers, it is characterized in that the derivation light path of deielectric-coating polarizer (5) is provided with gain media II (9), it further amplifies the stack square-topped pulse of deriving from resonant cavity.
5, according to claim 1 or 2 or 3 described multi-pulse superimposing amplifiers, the chamber that it is characterized in that resonant cavity is long, be that distance between high reflective mirror (3) and the high reflective mirror (7) is adjustable, the long size in chamber postpones decision by the relative time of the pulse that participates in stack in resonant cavity.
6, multi-pulse superimposing amplifier according to claim 4 is characterized in that the chamber of resonant cavity is long, and promptly the distance between high reflective mirror (3) and the high reflective mirror (7) is adjustable, and the long size in chamber postpones decision by the relative time of the pulse that participates in stack in resonant cavity.
7, according to claim 1 or 2 or 3 described multi-pulse superimposing amplifiers, the spectrum gain bandwidth that it is characterized in that gain media I (4) is in inferior nm magnitude, and it amplifies peak wavelength and is complementary with the centre wavelength that enters the pulse of resonant cavity.
8, a kind of femtosecond laser parameter chirped-pulse amplification laser, it is characterized in that this laser is made up of one of beam splitter (10), frequency converter (11), claim 1-7 described multi-pulse superimposing amplifier (12), frequency multiplier (13), pulse stretcher (14), delay line (15), dichroic mirror (16) and nonlinear crystal (17)
The described multi-pulse superimposing amplifier of one of frequency converter (11), claim 1-7 (12), frequency multiplier (13) are formed the pump light light path, and pulse stretcher (14) is arranged on the flashlight light path,
Beam splitter (10) is λ with the centre wavelength of input
0The ultrashort pulse string to be divided into centre wavelength be λ
0Flashlight 1
1With centre wavelength be λ
0Pump light source 1
2,
Frequency converter (11) will be λ from the centre wavelength of beam splitter
0Pump light source 1
2Converting centre wavelength to is λ
1The ultrashort pulse string, λ
1＞λ
0,
Multi-pulse superimposing amplifier (12) will carry out superimposed pulses and spectrum narrowing from the ultrashort pulse string of frequency converter, produce the pulse that arrowband flat-top pulsewidth reaches nanosecond order, and the centre wavelength of this pulse is λ
1,
Frequency multiplier (13) will carry out doubling frequency from the pulse of multi-pulse superimposing amplifier, and the centre wavelength that is produced is λ
2Square-topped pulse be pump light, λ
2=1/2 λ
1,
Pulse stretcher (14) will be λ from the centre wavelength of beam splitter (10)
0Flashlight broadening in time domain,
Delay line (15) is arranged on flashlight light path or the pump light light path, and the optical path difference of control signal light and pump light realizes that accurate light is directly synchronous,
Pump light and flashlight pulse stretcher broadening after of dichroic mirror (16) after with the frequency multiplier frequency multiplication injects nonlinear crystal (17) simultaneously, and nonlinear crystal (17) converts pump light to flashlight, output chirped pulse amplifying signal light.
9, femtosecond laser parameter chirped-pulse amplification laser according to claim 9 is characterized in that flashlight and the pump light non-colinear angle γ in nonlinear crystal (17) is 10 °～15 °.
10, according to Claim 8 or 9 described femtosecond laser parameter chirped-pulse amplification lasers, it is characterized in that frequency converter (11) is made of coupler (18), nano-photon crystal fiber (19) and band pass filter (20) successively, coupler (18) is λ with centre wavelength
0Pump light source 1
2Be coupled into nano-photon crystal fiber (19), produce super continuous spectrums in nano-photon crystal fiber (19), band pass filter (20) carries out light spectrum reshaping to super continuous spectrums, and obtaining centre wavelength is λ
1The ultrashort pulse string.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100216327A CN100392925C (en) | 2005-09-07 | 2005-09-07 | Multi-pulse superimposing amplifier and femtosecond laser parameter chirped-pulse amplification laser |
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| CNB2005100216327A CN100392925C (en) | 2005-09-07 | 2005-09-07 | Multi-pulse superimposing amplifier and femtosecond laser parameter chirped-pulse amplification laser |
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| CN100392925C CN100392925C (en) | 2008-06-04 |
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| CNB2005100216327A Expired - Fee Related CN100392925C (en) | 2005-09-07 | 2005-09-07 | Multi-pulse superimposing amplifier and femtosecond laser parameter chirped-pulse amplification laser |
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