CN103605249A - Double-pumped chirped compensation optical parametric amplification method and device - Google Patents
Double-pumped chirped compensation optical parametric amplification method and device Download PDFInfo
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- CN103605249A CN103605249A CN201310631148.0A CN201310631148A CN103605249A CN 103605249 A CN103605249 A CN 103605249A CN 201310631148 A CN201310631148 A CN 201310631148A CN 103605249 A CN103605249 A CN 103605249A
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Abstract
The invention discloses a double-pumped chirped compensation optical parametric amplification method and device. Femtosecond pump light generated by a pump laser source is divided into two beams through a beam splitter, passes through a pump stretcher and a pump delayer to obtain two chirp pump light beams, passes through a dichroic mirror and is incident on a nonlinear crystal. Femtosecond signal light generated by a signal laser source passes through a signal light stretcher to obtain chirp signal light, passes through the dichroic mirror, is in coupling with the two chirp pump light beams in time and space, is incident in the nonlinear crystal to generate optical parametric amplification, is incident on a light splitter for filter to obtain amplified chirp signal light, and passes through a pulse compressor to obtain the amplified femtosecond signal light. Chirp and delay are respectively added to the two pump light beams and the signal light, phase mismatching due to the fact that pulse instantaneous frequency deviates from center frequency in the corresponding instantaneous frequency compensation optical parametric amplification process is adjusted, the added chirp and the added delay are adjusted to amplify the low-frequency component and the high-frequency component of the chirp signal light respectively, and the gain spectrum width of the signal light is increased.
Description
Technical field
The present invention relates to ultrafast laser technique field, be specifically related to a kind of double pumping action chirp compensation optical parameter amplification method and device.
Background technology
The high intensity laser pulse of cycle magnitude has a wide range of applications in research fields such as high-order harmonic generation, relevant X ray generation and ultrafast process detections.In recent years, optical parametric amplification (Optical parametric amplification, OPA) because its gain spectral is roomy, tunability by force, almost do not have thermal effect accumulation and the advantage such as high-order nonlinear is little, become and will under titanium sapphire laser frequency, conversion produce the preferred option of infrared cycle magnitude ultra-intense laser pulse.
Yet, being subject to the restriction of nonlinear crystal size and damage threshold, the maximum pump energy that OPA can use can not meet the needs of a part of high field physical study.Therefore, chirped pulse amplification (Chirped-pulse amplification, CPA) is transplanted to and in OPA, has been formed optical parameter chirped pulse and amplify (OPCPA).OPCPA no longer selects ultrashort pulse as pump light, but uses the long pulse high energy laser pumping of psec or nanosecond instead, and the broadband signal light of input is also added into warble and makes magnitude that its pulsewidth reaches pump light to guarantee the abundant conversion of energy simultaneously.In OPCPA process,, there is the ideler frequency light that difference frequency obtains three beams low frequency in the low intensive chirp signal light of the high-intensity pump light of high-frequency and the low frequency incident nonlinear crystal that intercouples on time and space in crystal under the condition of phase matching.Generally, the phase-matching condition of OPCPA is to optimize for the centre frequency of flashlight, so the amplification efficiency of centre frequency composition is the highest, but along with the instantaneous frequency of chirp signal light departs from centre frequency, phase mismatch increases, and amplification efficiency reduces, and causes reducing of system-gain bandwidth.
Summary of the invention
Above defect or Improvement requirement for prior art, the object of the present invention is to provide a kind of double pumping action chirp compensation optical parameter amplification method and device, in chirp compensation OPA system, introduce two pumping pulses, two bundle pump lights and flashlight are added respectively and warbled and time delay, by adjusting in its corresponding instantaneous frequency compensating light parameter amplification process because pulse instantaneous frequency departs from the phase mismatch that centre frequency causes, and adjust warbling of two pumping pulses and make its low frequency that amplifies respectively chirp signal light and radio-frequency component with time delay, thereby further improve the gain spectrum width of photoparametric amplifier.
The technical solution adopted for the present invention to solve the technical problems is, a kind of double pumping action chirp compensation optical parameter amplification method is provided, and said method comprising the steps of:
S1, produce initial femtosecond pump light and initial femtosecond flashlight;
S2, initial femtosecond pump light is divided into two-beam, comprises the first femtosecond pump light and the second femtosecond pump light; Initial femtosecond flashlight is added to warble obtain chirp signal light, the first femtosecond pump light and the second femtosecond pump light are added respectively oppositely to warble obtain first pump light and second pump light of warbling of warbling;
S3, respectively first pump light and second pump light of warbling of warbling is added to time delay, first pump light of warbling is overlapped with prolonging after the pulse of chirp signal light in time domain, second pump light of warbling overlaps with prolonging after the pulse of chirp signal light in time domain;
S4, adjust first pump light, second the warbling and time delay of pump light, chirp signal light of warbling of warbling, make first pump light, second each instantaneous frequency constantly of pump light, chirp signal light of warbling of warbling all just reach phase matching, above-mentioned three-beam collinear incident is carried out to optical parameter amplification in nonlinear crystal, produce chirp signal light and ideler frequency light after amplifying, the pump light of warbling of output attenuatoin simultaneously;
S5, the pump light of warbling that filters decay, ideler frequency light obtain the chirp signal light after pure amplification, chirp signal light after described pure amplification is incided in pulse shortener, add linear negative to warble the chirp signal light after amplifying is compressed and obtains the shortest femtosecond flashlight of pulsewidth.
In double pumping action chirp compensation optical parameter amplification method of the present invention, in described step S2, initial femtosecond flashlight, the first femtosecond pump light, added the warbling of the second femtosecond pump light are to linear chrip, to simplify broadening and the compression process of pulse.
In double pumping action chirp compensation optical parameter amplification method of the present invention, in described step S2, according to the phase matching curve of initial femtosecond pump light wavelength and initial femtosecond signal light wavelength, respectively the curve of initial femtosecond flashlight degeneracy wavelength both sides nondegenerate wave band is carried out to linear fit, calculate the chirp coefficient that the first femtosecond pump light, the second femtosecond pump light are added.
In double pumping action chirp compensation optical parameter amplification method of the present invention, in described step S3, according to the phase matching curve of initial femtosecond pump light wavelength and initial femtosecond signal light wavelength, respectively the curve of initial femtosecond flashlight degeneracy wavelength both sides nondegenerate wave band is carried out to linear fit, calculate the time delay that the first femtosecond pump light, the second femtosecond pump light are added, guarantee that two pumping pulses of warbling amplify respectively low frequency and the HFS of chirp signal pulse, thereby obtain the ultrashort flashlight of degeneracy in broadband.
Correspondingly, the present invention also provides a kind of double pumping action chirp compensation optical parameter multiplying arrangement, and described device comprises pump light source, signal laser source, the first pumping stretcher, the second pumping stretcher, flashlight stretcher, the first pump light chronotron, the second pump light chronotron, beam splitter, catoptron, the first dichroic mirror, the second dichroic mirror, nonlinear crystal, light splitting piece and pulse shortener;
The initial femtosecond pump light that pump laser source produces is divided into two bundles through beam splitter, comprise the first femtosecond pump light and the second femtosecond pump light, the first femtosecond pump light obtains first pump light of warbling through the first pumping stretcher, the first pumping chronotron successively, the second femtosecond pump light obtains second pump light of warbling through catoptron, the second pumping stretcher, the second pump light chronotron successively, and the first pumping stretcher is warbled as oppositely to the second femtosecond pump light is added to the first femtosecond pump light and the second pumping stretcher; First pump light of warbling jointly incides nonlinear crystal through the second dichroic mirror and second pump light of warbling after the first dichroic mirror;
The initial femtosecond signal that signal laser source produces obtains the first chirp signal light through flashlight stretcher, chirp signal light through the first dichroic mirror with incide second of the first dichroic mirror pump light of warbling and be coupled on time and space, through the second dichroic mirror, be coupled on time and space with inciding first of the second dichroic mirror pump light of warbling, gained light beam jointly incides and in nonlinear crystal, optical parameter occurs and amplify again; From the pump light of warbling, the chirp signal light of nonlinear crystal output and the ideler frequency light of warbling, jointly incide light splitting piece and obtain the chirp signal light pure amplification with warble pump light and the ideler frequency light of warbling of filtering; Chirp signal light after described pure amplification incides in pulse shortener, adds linear negative to warble the chirp signal light after amplifying is compressed and obtains the shortest femtosecond flashlight of pulsewidth.
In double pumping action chirp compensation optical parameter multiplying arrangement of the present invention, described the first pumping stretcher is warbled as linear chrip to the first femtosecond pump light is added, and the second pumping stretcher is warbled as linear chrip to the second femtosecond pump light is added.
In double pumping action chirp compensation optical parameter multiplying arrangement of the present invention, according to the phase matching curve of initial femtosecond pump light wavelength and initial femtosecond signal light wavelength, respectively the curve of initial femtosecond flashlight degeneracy wavelength both sides nondegenerate wave band is carried out to linear fit, calculate the chirp coefficient that described the first pumping stretcher adds the second femtosecond pump light the first femtosecond pump light, the second pumping stretcher.
In double pumping action chirp compensation optical parameter multiplying arrangement of the present invention, according to the phase matching curve of initial femtosecond pump light wavelength and initial femtosecond signal light wavelength, respectively the curve of initial femtosecond flashlight degeneracy wavelength both sides nondegenerate wave band is carried out to linear fit, calculate the time delay that described the first pumping chronotron adds the second femtosecond pump light the first femtosecond pump light, the second pumping chronotron, guarantee that two pumping pulses of warbling amplify respectively low frequency and the HFS of chirp signal pulse, thereby obtain the ultrashort flashlight of degeneracy in broadband.
Therefore, the present invention can obtain following beneficial effect: the method for utilizing chirp compensation optical parameter to amplify, initial femtosecond pump light is divided into two bundle femtosecond pump lights, and two bundle femtosecond pump lights and initial femtosecond flashlight are added respectively and warbled and time delay obtains two bundles warble pump light and chirp signal light, and adjust chirp coefficient and delay time and make two bundles each instantaneous frequency constantly of pump light and chirp signal light of warbling all just reach phase matching, with in compensating light parameter amplification process because pulse instantaneous frequency departs from the phase mismatch that centre frequency causes; Simultaneously, adjust delay time two bundles are warbled pump light prolongs before the pulse of corresponding chirp signal light respectively in time domain and after prolong, amplify low frequency and the radio-frequency component of chirp signal light degeneracy wavelength both sides, can utilize band-limited pumping pulse to further expand the gain spectrum width of chirp compensation optical parameter amplification system, to obtain the ultrashort flashlight of degeneracy in broadband.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is double pumping action chirp compensation optical parameter multiplying arrangement structural representation of the present invention;
Fig. 2 is the graph of a relation of the crystal-cut angle of one embodiment of the invention pump light and signal light wavelength while being 19.89 °, wherein, wavelength relationship figure when solid line reaches perfect phase matching for both, two dotted lines are respectively after linear fit first the warble corresponding wavelength graph of a relation of pump light and chirp signal light of pump light and second of warbling;
Fig. 3 is the initialize signal light of one embodiment of the invention and the spectrogram of output signal flashlight, and wherein dotted line is the spectrogram of initialize signal pulse, and solid line is the output pulse frequency spectrogram after amplifying;
Fig. 4 is the output pulse temporal envelope figure after the compression of one embodiment of the invention, wherein, the Fourier transform limit pulse schematic diagram that Fig. 4 (a) supports in theory for output spectrum, Fig. 4 (b) is for having compensated the femtosecond signal pulse schematic diagram obtaining after single order is warbled.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.In addition,, in each embodiment of described the present invention, involved technical characterictic just can not combine mutually as long as do not form each other conflict.
Double pumping action chirp compensation optical parameter amplification method of the present invention, comprises the following steps:
S1, produce initial femtosecond pump light and initial femtosecond flashlight;
S2, initial femtosecond pump light is divided into two-beam, comprises the first femtosecond pump light and the second femtosecond pump light; To initial femtosecond flashlight, add linear positive/negative warbling to obtain chirp signal light, the first femtosecond pump light and the second femtosecond pump light are added respectively linear positive/negative or negative/just warbling obtains first pump light and second pump light of warbling of warbling;
S3, respectively warble pump light 1 and the pump light 2 of warbling are added to time delay, make to warble pump light 1 in time domain with after the pulse of chirp signal light, prolong (radio-frequency component) and overlap, warble pump light 2 in time domain with before the pulse of chirp signal light, prolong (low-frequency component) and overlap;
S4, adjust warbling and time delay of the pump light 1 of warbling, the pump light 2 of warbling, chirp signal light, each instantaneous frequency constantly of pump light 1, the pump light 2 of warbling, chirp signal light that makes to warble all reaches phase matching just, above-mentioned three-beam collinear incident is carried out to optical parameter amplification in the suitable nonlinear crystal of cutting angle, produce chirp signal light and ideler frequency light after amplifying, the pump light of warbling of output attenuatoin simultaneously;
S5, the pump light of warbling that filters decay, ideler frequency light obtain the chirp signal light after pure amplification, by in the chirp signal Guang Rudao road pulse shortener after described pure amplification, add linear negative to warble the chirp signal light after amplifying is compressed and obtains the shortest femtosecond flashlight of pulsewidth.
In above-mentioned steps S2, S3, initial femtosecond flashlight, the first femtosecond pump light, added the warbling of the second femtosecond pump light are to linear chrip, to simplify broadening and the compression process of pulse.According to the phase matching curve of initial femtosecond pump light wavelength and initial femtosecond signal light wavelength, respectively the curve of initial femtosecond flashlight degeneracy wavelength both sides nondegenerate wave band is carried out to linear fit, calculate chirp coefficient and time delay that the first femtosecond pump light, the second femtosecond pump light are added, guarantee that two pumping pulses of warbling amplify respectively low frequency and the HFS of chirp signal pulse, thereby obtain the ultrashort flashlight of degeneracy in broadband.
Based on said method, the present invention proposes a kind of double pumping action chirp compensation optical parameter multiplying arrangement, as shown in Figure 1, device comprises pump light source 1, signal laser source 2, the first pumping stretcher 3, the second pumping stretcher 4, flashlight stretcher 5, the first pump light chronotron 6, the second pump light chronotron 7, beam splitter 8, catoptron 9, the first dichroic mirror 10, the second dichroic mirror 11, nonlinear crystal 12, light splitting piece 13 and pulse shortener 14.
The initial femtosecond pump light that pump laser source 1 produces is divided into two bundles through beam splitter 8, comprise the first femtosecond pump light and the second femtosecond pump light, the first femtosecond pump light obtains first pump light of warbling through the first pumping stretcher 3, the first pumping chronotron 6 successively, the second femtosecond pump light obtains second pump light of warbling through catoptron 9, the second pumping stretcher 4, the second pump light chronotron 7 successively, and first 3 pairs of pumping stretchers the first femtosecond pump light and 4 pairs of the second femtosecond pump lights of the second pumping stretcher are added warbles as oppositely; First pump light of warbling jointly incides nonlinear crystal 12 through the second dichroic mirror 11 and second pump light of warbling after the first dichroic mirror 10;
The initial femtosecond signal that signal laser source 2 produces obtains chirp signal light through flashlight stretcher 5, chirp signal light through the first dichroic mirror 10 with incide second of the first dichroic mirror 10 pump light of warbling and be coupled on time and space, through the second dichroic mirror 11, be coupled on time and space with inciding first of the second dichroic mirror 11 pump light of warbling, gained light beam jointly incides and in nonlinear crystal 12, optical parameter occurs and amplify again; From the pump light of warbling, the chirp signal light of nonlinear crystal 12 output and the ideler frequency light of warbling, jointly incide light splitting piece 13 and obtain the chirp signal light pure amplification with warble pump light and the ideler frequency light of warbling of filtering, chirp signal light after pure amplification reenters and is mapped in pulse shortener 14, add linear negative to warble the chirp signal light after amplifying is compressed, obtain the shortest femtosecond flashlight of pulsewidth.
In above-mentioned double pumping action chirp compensation optical parameter multiplying arrangement, first 3 pairs of pumping stretchers the first femtosecond pump light is added warbles as linear chrip, and second 4 pairs of pumping stretchers the second femtosecond pump light is added warbles as linear chrip, according to the phase matching curve of initial femtosecond pump light wavelength and initial femtosecond signal light wavelength, respectively the curve of initial femtosecond flashlight degeneracy wavelength both sides nondegenerate wave band is carried out to linear fit, calculate 3 pairs of the first femtosecond pump lights of described the first pumping stretcher, the chirp coefficient that second 4 pairs of pumping stretchers the second femtosecond pump light adds and 3 pairs of the first femtosecond pump lights of the first pumping chronotron, the time delay that second 4 pairs of pumping chronotrons the second femtosecond pump light adds, guarantee that two pumping pulses of warbling amplify respectively low frequency and the HFS of chirp signal pulse, thereby the ultrashort flashlight of the degeneracy that obtains broadband.
Further, according to the phase matching curve of pump light and signal light wavelength, can find out, frequency content for flashlight degeneracy wavelength both sides, phase matching curve is respectively monotone increasing and monotone decreasing, therefore can by chirp compensation optical parameter amplification method, realize respectively the amplification of nondegenerate wave band.In conjunction with the two bundles pump light of warbling, jointly amplify chirp signal light and just can, by the nondegenerate wave band gain stack of both sides, further expand the gain spectrum width of flashlight.Experimentally, the time delays of the warbling of pump light and flashlight, two bundle pump lights are adjusted by stretcher and chronotron separately respectively, by observing system output spectrum, carry out corresponding adjusting input parameter, can make system performance reach optimization.
Below lift a specific embodiment.
It is 30fs that the femto second titanium precious stone laser regenerative amplifier of take produces pulsewidth as pumping source, and centre wavelength is 800nm, the pumping pulse that repetition frequency is 1kHz.The broadband infrared pulse that the pulsewidth of usining is 3.8nJ as 10fs, centre wavelength as 1600nm, energy is as flashlight.The thickness of take is 1.6mm, and cutting angle is that the BBO of 19.89 ° is nonlinear crystal.The energy of input pumping pulse is 3.7mJ, and spot diameter is 3mm, corresponding to 100GW/cm
2peak strength, the lower broadband supercontinuum of energy obtains and amplifies as initialize signal light.
Phase matching curve in Fig. 2 is seen, the pump light of 790nm～810nm scope can mate respectively the flashlight of about 200nm bandwidth at low frequency and the high-frequency region of degeneracy frequency both sides, and can carry out preferably linear fit, so can at least within the scope of 400nm, reach Broadband Matching on double pumping action theoretical method.
Fig. 3 has provided the input and output frequency spectrum of flashlight, can find out, flashlight is obviously amplified within the scope of 1300nm～1900nm, can support to be less than in theory the output pulse width in two cycles.The energy conversion efficiency of simultaneously exporting pulse has reached more than 20%.
Fig. 4 provided the Fourier transform limit pulse of this Frequency Spectral Theory support and compensated single order warble after the pulse that obtains of compression.The pulse of transform limit is about 8.9fs, corresponding approximately 1.6 photoperiods, and only by the single order of compensated pulse, warble, just just Pulse Compression to two photoperiod with interior (10.3fs), this character of output signal light can be simplified the difficulty of compression pulse greatly, has experimentally higher feasibility.
Above result shows, the chirp signal light that the pump light of warbling that utilizes two bundles to optimize chirp coefficient and time delay is degeneracy wavelength to a branch of centre wavelength carries out double pumping action chirp compensation optical parameter and amplifies, can realize the broadband of degeneracy flashlight amplifies, output pulse width is less than two photoperiodic infrared pulses, and the energy conversion efficiency of simultaneity factor can reach more than 20%.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a double pumping action chirp compensation optical parameter amplification method, is characterized in that, said method comprising the steps of:
S1, produce initial femtosecond pump light and initial femtosecond flashlight;
S2, initial femtosecond pump light is divided into two-beam, comprises the first femtosecond pump light and the second femtosecond pump light; Initial femtosecond flashlight is added to warble obtain chirp signal light, the first femtosecond pump light and the second femtosecond pump light are added respectively oppositely to warble obtain first pump light and second pump light of warbling of warbling;
S3, respectively first pump light and second pump light of warbling of warbling is added to time delay, first pump light of warbling is overlapped with prolonging after the pulse of chirp signal light in time domain, second pump light of warbling overlaps with prolonging after the pulse of chirp signal light in time domain;
S4, adjust first pump light, second the warbling and time delay of pump light, chirp signal light of warbling of warbling, make first pump light, second each instantaneous frequency constantly of pump light, chirp signal light of warbling of warbling all just reach phase matching, above-mentioned three-beam collinear incident is carried out to optical parameter amplification in nonlinear crystal, produce chirp signal light and ideler frequency light after amplifying, the pump light of warbling of output attenuatoin simultaneously;
S5, the pump light of warbling that filters decay, ideler frequency light obtain the chirp signal light after pure amplification, chirp signal light after described pure amplification is incided in pulse shortener, add linear negative to warble the chirp signal light after amplifying is compressed and obtains the shortest femtosecond flashlight of pulsewidth.
2. double pumping action chirp compensation optical parameter amplification method as claimed in claim 1, it is characterized in that, in described step S2, initial femtosecond flashlight, the first femtosecond pump light, added the warbling of the second femtosecond pump light are to linear chrip, to simplify broadening and the compression process of pulse.
3. double pumping action chirp compensation optical parameter amplification method as claimed in claim 2, it is characterized in that, in described step S2, according to the phase matching curve of initial femtosecond pump light wavelength and initial femtosecond signal light wavelength, respectively the curve of initial femtosecond flashlight degeneracy wavelength both sides nondegenerate wave band is carried out to linear fit, calculate the chirp coefficient that the first femtosecond pump light, the second femtosecond pump light are added.
4. double pumping action chirp compensation optical parameter amplification method as claimed in claim 3, it is characterized in that, in described step S3, according to the phase matching curve of initial femtosecond pump light wavelength and initial femtosecond signal light wavelength, respectively the curve of initial femtosecond flashlight degeneracy wavelength both sides nondegenerate wave band is carried out to linear fit, calculate the time delay that the first femtosecond pump light, the second femtosecond pump light are added, guarantee that two pumping pulses of warbling amplify respectively low frequency and the HFS of chirp signal pulse, thereby obtain the ultrashort flashlight of degeneracy in broadband.
5. a double pumping action chirp compensation optical parameter multiplying arrangement, it is characterized in that, described device comprises pump light source (1), signal laser source (2), the first pumping stretcher (3), the second pumping stretcher (4), flashlight stretcher (5), the first pump light chronotron (6), the second pump light chronotron (7), beam splitter (8), catoptron (9), the first dichroic mirror (10), the second dichroic mirror (11), nonlinear crystal (12), light splitting piece (13) and pulse shortener (14);
The initial femtosecond pump light that pump laser source (1) produces is divided into two bundles through beam splitter (8), comprise the first femtosecond pump light and the second femtosecond pump light, the first femtosecond pump light is successively through the first pumping stretcher (3), the first pumping chronotron (6) obtains first pump light of warbling, the second femtosecond pump light passes through catoptron (9) successively, the second pumping stretcher (4), the second pump light chronotron (7) obtains second pump light of warbling, the first pumping stretcher (3) is warbled as oppositely to the second femtosecond pump light is added to the first femtosecond pump light and the second pumping stretcher (4), first pump light of warbling jointly incides nonlinear crystal (12) successively through the second dichroic mirror (11) and second pump light of warbling after the first dichroic mirror (10), the second dichroic mirror (11),
The initial femtosecond flashlight that signal laser source (2) produces obtains chirp signal light through flashlight stretcher (5), chirp signal light through the first dichroic mirror (10) with incide second of the first dichroic mirror (10) pump light of warbling and be coupled on time and space, through the second dichroic mirror (11), be coupled on time and space with inciding first of the second dichroic mirror (11) pump light of warbling, gained light beam jointly incides and in nonlinear crystal (12), optical parameter occurs and amplify again; From the pump light of warbling, the chirp signal light of nonlinear crystal (12) output and the ideler frequency light of warbling, jointly incide light splitting piece (13) and obtain the chirp signal light pure amplification with warble pump light and the ideler frequency light of warbling of filtering; Chirp signal light after described pure amplification incides in pulse shortener (14), adds linear negative to warble the chirp signal light after amplifying is compressed and obtains the shortest femtosecond flashlight of pulsewidth.
6. double pumping action chirp compensation optical parameter multiplying arrangement as claimed in claim 5, it is characterized in that, described the first pumping stretcher (3) is warbled as linear chrip to the first femtosecond pump light is added, and the second pumping stretcher (4) is warbled as linear chrip to the second femtosecond pump light is added.
7. double pumping action chirp compensation optical parameter multiplying arrangement as claimed in claim 6, it is characterized in that, according to the phase matching curve of initial femtosecond pump light wavelength and initial femtosecond signal light wavelength, respectively the curve of initial femtosecond flashlight degeneracy wavelength both sides nondegenerate wave band is carried out to linear fit, calculate the chirp coefficient that described the first pumping stretcher (3) adds the second femtosecond pump light the first femtosecond pump light, the second pumping stretcher (4).
8. double pumping action chirp compensation optical parameter multiplying arrangement as claimed in claim 7, it is characterized in that, according to the phase matching curve of initial femtosecond pump light wavelength and initial femtosecond signal light wavelength, respectively the curve of initial femtosecond flashlight degeneracy wavelength both sides nondegenerate wave band is carried out to linear fit, calculate described the first pumping chronotron (3) to the first femtosecond pump light, the time delay that the second pumping chronotron (4) adds the second femtosecond pump light, guarantee that two pumping pulses of warbling amplify respectively low frequency and the HFS of chirp signal pulse, thereby the ultrashort flashlight of the degeneracy that obtains broadband.
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| CN106209249A (en) * | 2016-07-26 | 2016-12-07 | 浙江大学 | The double chirp radar pulse generator of wideband adjustable based on microwave photon technology |
| CN108281877A (en) * | 2018-03-14 | 2018-07-13 | 成都师范学院 | Chirped laser pulse frequency spectrum shaping system based on spectrum angle dispersion |
| EP3382826A1 (en) * | 2017-03-30 | 2018-10-03 | GSI Helmholtzzentrum für Schwerionenforschung GmbH | Method and device for creating a phase modulated ultrashort laser pulse |
| CN108873558A (en) * | 2017-05-12 | 2018-11-23 | 武汉工程大学 | A kind of chirp compensation optically erasing method and device of Broadband pump |
| CN110112644A (en) * | 2019-04-29 | 2019-08-09 | 华中科技大学 | A kind of high-energy lacks period optical parameter amplification method and device |
| CN111600189A (en) * | 2020-06-02 | 2020-08-28 | 中国工程物理研究院激光聚变研究中心 | Pump seed synchronization system and method based on ultrashort pulse optical parameter amplification |
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