CN103712699B - Laser pulse contrast measurement mechanism based on light amplitude limit - Google Patents
Laser pulse contrast measurement mechanism based on light amplitude limit Download PDFInfo
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- CN103712699B CN103712699B CN201410007476.8A CN201410007476A CN103712699B CN 103712699 B CN103712699 B CN 103712699B CN 201410007476 A CN201410007476 A CN 201410007476A CN 103712699 B CN103712699 B CN 103712699B
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Abstract
The invention provides a kind of laser pulse contrast measurement mechanism based on light amplitude limit. In described measurement mechanism, in high-power laser pulse incident direction, place successively collimating mirror, attenuator, beam splitter I, on the transmitted light path of beam splitter I, set gradually frequency-doubling crystal, filter plate, beam splitter II, on the reflected light path of beam splitter I, set gradually half-wave plate, beam splitter III; On the reflected light path of beam splitter III, set gradually convex lens I, limiter, convex lens II, delay modulator, the frequency doubled light being produced by frequency-doubling crystal is divided into transmission and reflection two parts through beam splitter II, respectively with transmission from beam splitter III and reflection fundamental frequency light and be advanced into two third-order relevant instruments, the coherent signal of two third-order relevant instrument generations gathers through CCD, finally carries out data processing by computer. Flexible adjustment of the present invention is convenient, test wide dynamic range.
Description
Technical field
The invention belongs to high-power laser test technical field, be specifically related to a kind of for high-power laser test based onThe laser pulse contrast measurement mechanism of light amplitude limit.
Background technology
Beat in the various experiments of solid target at substantial radiation source, advanced gamma light source and substantial radiation source, prepulsing producesRaw gasification substance and plasma all can change the state of target material, thereby influence process even changes mechanism of action,Contrast becomes the bottleneck of the many experiments of restriction. If there is no sufficiently high laser pulse contrast, do not reach the reality needingTest result. The development of ultrashort pulse technology is in the urgent need to carrying out the test of single-shot subpulse contrast, and name is called " laser pulse shapeMeasurement mechanism " Chinese utility model patent (patent No. ZL201020690649.8) disclose one and passed through plasmaPulse is blocked, and measures simultaneously and blocks pulsed optical signals and the laser signal postponing through certain hour, carries out graphic joining reconstructObtain the method for pulse contrast. It is special that name is called the Chinese utility model of " apparatus for measuring high power ultra-short laser pulse contrast "Profit (patent No. ZL200720077677.0) discloses a kind of by the survey of non-colinear third-order correlation signal acquisition pulse contrastMetering method. Owing to being subject to the restriction of detecting devices, the dynamic range of these device to test is limited.
Summary of the invention
In order to overcome the deficiency of the narrow dynamic range of existing measuring technique in laser pulse contrast is measured, the present inventionA kind of laser pulse contrast measurement mechanism based on light amplitude limit is provided.
The technical solution adopted for the present invention to solve the technical problems is:
Laser pulse contrast measurement mechanism based on light amplitude limit of the present invention, is characterized in, in described measurement mechanism,In high-power laser pulse incident direction, place successively collimating mirror, attenuator, beam splitter I. Incident pulse light divides through beam splitter IBecome transmitted light and reverberation, on the transmitted light path of beam splitter I, be disposed with frequency-doubling crystal, filter plate, beam splitter II, dividingOn the reflected light path of bundle mirror I, be disposed with half-wave plate, beam splitter III. The transmitted light of beam splitter I produces frequency multiplication through frequency-doubling crystalLight, described frequency doubled light projects after by the remaining fundamental frequency light of filter plate filtering and in beam splitter II, is divided into transmission frequency doubled light and anti-Penetrate frequency doubled light, the reverberation of beam splitter I projects in beam splitter III after by half-wave plate, is divided into transmission fundamental frequency light through beam splitter IIIWith reflection fundamental frequency light. The transmission fundamental frequency light of beam splitter III and the reflection frequency doubled light of beam splitter II are also advanced into third-order relevant instrument I,On the frequency tripling beam direction that third-order relevant instrument I produces, place successively algorithm sheet, lens pillar I, CCD I, by third-order correlationThe frequency tripling light beam that instrument I produces, successively by algorithm sheet, lens pillar I, enters CCD I. On the reflected light path of beam splitter IIISet gradually convex lens I, limiter, convex lens II, delay modulator; The reflection fundamental frequency light of described beam splitter III passes through convex lensAfter mirror I, limiter, convex lens II, delay modulator with the transmission frequency doubled light of beam splitter II and be advanced into third-order relevant instrument II,On the frequency tripling beam direction that third-order relevant instrument II produces, place successively algorithm sheet II, lens pillar II, CCD II, by threeThe frequency tripling light beam that rank correlator II produces, successively by algorithm sheet II, lens pillar II, enters CCD II; Described CCDI, CCD II external computer respectively, finally enters computer from the signal of CCD I, CCD II and carries out data processing.
Described limiter is positioned at the common focal plane place of the colimated light system of convex lens I and convex lens II formation, in limiterMaterial can be both solid, can be also the liquid packing in transparent vessel.
Described third-order relevant instrument I, third-order relevant instrument II adopts 90 degree non-colinear ooe positions to match, according to different enteringEjected wave length is selected different and frequency crystalline material.
The invention has the beneficial effects as follows:
1. the present invention adopts optical limiter paired pulses peak region to carry out precommpression, and prepulsing can be undampedCross, by changing material concentration or the material thickness in limiter, can control well the compression ratio of peak region, improve pre-The detectable ability of pulse.
2. the present invention adopts 90 degree non-colinear ooe positions to match, to large with the adjusting surplus of frequency crystal, and therefore this device toolThere is flexible adjustment advantage easily;
3. the present invention adopts subregion measuring method,, for ranging pulse peak region, separately leads up to and postpone to regulate in a roadDevice regulates the prepulsing region of the time delay measurement pulse of fundamental frequency signal and frequency-doubled signal, has improved that pulse contrast testsWriting time scope.
Brief description of the drawings
Fig. 1 is the laser pulse contrast measurement mechanism light path schematic diagram based on light amplitude limit of the present invention;
In figure, 1. collimating mirror 2. attenuator 3. beam splitter I 4. frequency-doubling crystal 5. filter plate 6. beam splitter II 7.Half-wave plate 8. beam splitter III 9. third-order relevant instrument I 10. algorithm sheet 11. lens pillar I 12.CCD I 13. convex lens I14. limiter 15. convex lens II 16. delay modulator 17. third-order relevant instrument II 18. algorithm sheet II 19. columns are saturatingMirror II 20.CCD II.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described, but should not limit protection model of the present invention with thisEnclose.
Embodiment 1
Fig. 1 is the laser pulse contrast measurement mechanism light path schematic diagram based on light amplitude limit of the present invention. In Fig. 1, thisThe bright laser pulse contrast measurement mechanism based on light amplitude limit, in described measurement mechanism, in high-power laser pulse incidentIn direction, place successively collimating mirror 1, attenuator 2, beam splitter I 3; Incident pulse light is divided into transmitted light and reflection through beam splitter I 3Light is disposed with frequency-doubling crystal 4, filter plate 5, beam splitter II 6 on the transmitted light path of beam splitter I 3, anti-in beam splitter I 3Penetrate and in light path, be disposed with half-wave plate 7, beam splitter III 8; The transmitted light of beam splitter I 3 produces frequency doubled light through frequency-doubling crystal 4, instituteThe frequency doubled light of stating projects after by the remaining fundamental frequency light of filter plate 5 filtering and in beam splitter II 6, is divided into transmission frequency doubled light and reflectionFrequency doubled light, the reverberation of beam splitter I 3 projects in beam splitter III 8 after by half-wave plate 7, is divided into transmission fundamental frequency through beam splitter III 8Light and reflection fundamental frequency light; The transmission fundamental frequency light of beam splitter III 8 and the reflection frequency doubled light of beam splitter II 6 are also advanced into third-order relevant instrumentI 9, places algorithm sheet 10, lens pillar I 11, CCD I successively in third-order relevant instrument I 9 on the frequency tripling beam direction producing12, the frequency tripling light beam being produced by third-order relevant instrument I 9 by algorithm sheet 10, lens pillar I 11, enters CCD I 12 successivelyReceive; On the reflected light path of beam splitter III 8, set gradually convex lens I 13, limiter 14, convex lens II 15, delay modulator 16;The reflection fundamental frequency light of described beam splitter III 8 by convex lens I 13, limiter 14, convex lens II 15, delay modulator 16 after withThe transmission frequency doubled light of beam splitter II 6 is also advanced into third-order relevant instrument II 17, the frequency tripling light beam producing in third-order relevant instrument II 17In direction, place successively algorithm sheet II 18, lens pillar II 19, CCD II 20, produced by third-order relevant instrument II 17 three timesFrequently light beam, successively by algorithm sheet II 18, lens pillar II 19, enters CCD II 20; 20 points of described CCD I 12, CCD IINot not external computer, finally enters computer from the signal of CCD I 12, CCD II 20 and carries out data processing.
Described limiter 14 is positioned at the common focal plane place of the colimated light system that convex lens I 13 and convex lens II 15 form, limitThe material that width device is 14 li can be both solid, can be also the liquid packing in transparent vessel.
Described third-order relevant instrument I 9, third-order relevant instrument II 17 adopts 90 degree non-colinear ooe positions to match. According to differentIncident wavelength is selected different and frequency crystalline material.
The principle that laser pulse contrast based on light amplitude limit is measured is: measured laser pulse enters limiter after samplingIn amplitude limit material, utilize the Excited-state Absorption principle based on such as two-photon absorption induction to make optics amplitude limit material at the low light levelThe characteristic of non-linear absorption under lower transparent, high light, versus pulse strength is carried out precommpression, reduces the contrast of measured pulse, utilizesBurst length strength signal is converted to spatial-intensity signal by correlation method, by subregion method, main pulse and prepulsing dividedRegion measurement, the main pulse of obtaining and prepulsing signal carry out Waveform Reconstructing through control system and image processing, finally restore arteries and veinsThe contrast information of punching.
In the present embodiment, the first incidence surface of described beam splitter II 6 plates semi-transparent semi-reflecting film, and second surface plating is anti-reflectionFilm; The first incidence surface of beam splitter III 8 plates the deielectric-coating that inverse ratio is 1:k, second surface plating anti-reflection film.
In the present embodiment, the effect of described delay modulator 16 be ensure through the fundamental frequency light prepulsing of limiter 14 withThe peak value of frequency-doubled signal is synchronous, and the effect of limiter 14 is peak values of decay fundamental frequency signal, and allows the prepulsing portion of fundamental frequency signalDivide undamped passing through.
In the present embodiment, incident pulse center wavelength of light is 1053nm, and pulse width is about 10 psecs.
First the fundamental frequency signal of 1053nm is collimated into directional light through collimating mirror 1 and incides in beam splitter I 3, be divided into intensityThe transmission and the reverberation that do not wait, weak transmitted light produces the frequency doubled light of 527nm through frequency-doubling crystal 4, then will remain with filter plate 5Complementary basis light absorption frequently, frequency doubled light is undamped to be passed through, and recycling beam splitter II 6, beam splitter III 8 are divided frequency doubled light and fundamental frequency light respectivelyBecome two bundles, through weak fundamental frequency light and the frequency doubled light reflecting through beam splitter II 6 of 8 transmissions of beam splitter III and be advanced into third-order correlationInstrument I 9, with the angles of approximately 30.1 degree 9 li of third-order relevant instrument I with frequency KDP crystal in intersect, this light path should make frequency-doubled signalMain pulse peak value is synchronizeed with the main pulse peak value of fundamental frequency signal, and the 351nm coherent signal being produced by third-order relevant instrument I 9 after filtrationWave attenuation sheet 10 enters CCD12, and the peak strength of coherent signal is positioned at the center of CCD12; Reflect through beam splitter III 8The limiter system that strong fundamental frequency light planoconvex lens I 13, limiter 14, convex lens II 15 form carries out, after peak value precommpression, passing throughDelay modulator 16 regulates time delay, with frequency doubled light through 6 transmissions of beam splitter II and be advanced into third-order relevant instrument II 17, with approximately30.1 degree angles 17 li of third-order relevant instrument II with frequency KDP crystal in intersect, main pulse peak value and the fundamental frequency of frequency-doubled signalThe time delay τ of the main pulse peak value of signal regulates by delay modulator, with frequency crystal in the 351nm phase that producesPass signal after filtering attenuator 18 enters CCD20. The saturating inverse ratio of supposing beam splitter III 8 is 1:k1, enter CCD12 and enterThe attenuation ratio of the algorithm sheet before CCD20 is k2: 1, the intensity obtaining in CCD12 center is I1(3 ω), in CCD20The intensity that heart position obtains is I2(3 ω), k1×k2×I1(3ω)/I2(3 ω) is ultrashort pulse peak value to be measured and prepulsingThe pulse contrast of time delay while being τ.
Claims (3)
1. the laser pulse contrast measurement mechanism based on light amplitude limit, is characterized in that: in described measurement mechanism, at Gao GongIn rate laser pulse incident direction, place successively collimating mirror (1), attenuator (2), beam splitter I (3); Incident pulse light is through beam splitterI (3) is divided into transmitted light and reverberation, is disposed with frequency-doubling crystal (4), filter plate on the transmitted light path of beam splitter I (3)(5), beam splitter II (6), on the reflected light path of beam splitter I (3), be disposed with half-wave plate (7), beam splitter III (8); Beam splittingThe transmitted light of mirror I (3) produces frequency doubled light through frequency-doubling crystal (4), and described frequency doubled light is by the remaining fundamental frequency of filter plate (5) filteringAfter light, project in beam splitter II (6) and be divided into transmission frequency doubled light and reflection frequency doubled light, the reverberation of beam splitter I (3) passes through half-waveAfter sheet (7), project beam splitter III (8) upper, be divided into transmission fundamental frequency light and reflection fundamental frequency light through beam splitter III (8); Beam splitter III(8) the reflection frequency doubled light of transmission fundamental frequency light and beam splitter II (6) is also advanced into third-order relevant instrument I (9), in third-order relevant instrument I(9) on the frequency tripling beam direction producing, place successively algorithm sheet (10), lens pillar I (11), CCD I (12), by three rankThe frequency tripling light beam that correlator I (9) produces, successively by algorithm sheet (10), lens pillar I (11), enters CCD I (12);On the reflected light path of beam splitter III (8), set gradually convex lens I (13), limiter (14), convex lens II (15), delay modulator(16), the reflection fundamental frequency light of described beam splitter III (8) by convex lens I (13), limiter (14), convex lens II (15), prolongLate after adjuster (16) and the transmission frequency doubled light of beam splitter II (6) be advanced into third-order relevant instrument II (17), at third-order relevant instrumentOn the frequency tripling beam direction that II (17) produces, place successively algorithm sheet II (18), lens pillar II (19), CCD II(20) the frequency tripling light beam, being produced by third-order relevant instrument II (17) is successively by algorithm sheet II (18), lens pillar II(19), enter CCD II (20); Described CCD I (12), CCD II (20) external computer respectively, from CCD I (12), CCD II(20) signal finally enters computer and carries out data processing.
2. the laser pulse contrast measurement mechanism based on light amplitude limit according to claim 1, is characterized in that: described limitWidth device (14) is positioned at the common focal plane place of the colimated light system of convex lens I (13) and convex lens II (15) formation.
3. the laser pulse contrast measurement mechanism based on light amplitude limit according to claim 1, is characterized in that: described threeRank correlator I (9), third-order relevant instrument II (17) adopt 90 degree non-colinear ooe positions to match.
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| CN104535201B (en) * | 2015-01-05 | 2017-08-15 | 中国工程物理研究院激光聚变研究中心 | A kind of apparatus for measuring high power ultra-short laser pulse contrast |
| CN107677379B (en) * | 2017-09-30 | 2023-06-09 | 中国工程物理研究院激光聚变研究中心 | Femtosecond laser pulse waveform measuring device |
| CN107782456A (en) * | 2017-09-30 | 2018-03-09 | 中国工程物理研究院激光聚变研究中心 | A kind of ultrashort laser pulse measurement apparatus |
| CN109060151B (en) * | 2018-09-05 | 2023-08-15 | 中国工程物理研究院激光聚变研究中心 | Subnanosecond laser pulse contrast measuring device |
| CN109738078A (en) * | 2019-01-16 | 2019-05-10 | 中国工程物理研究院激光聚变研究中心 | A kind of single-shot time autocorrelation measurement device |
| CN109540305A (en) * | 2019-01-16 | 2019-03-29 | 中国工程物理研究院激光聚变研究中心 | A kind of autocorrelation function analyzer |
| CN114061457B (en) * | 2021-11-18 | 2023-12-05 | 中国工程物理研究院激光聚变研究中心 | Target positioning system and method for tightly focused laser device based on two-photon fluorescence effect |
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| CN201166588Y (en) * | 2007-12-28 | 2008-12-17 | 中国科学院上海光学精密机械研究所 | Apparatus for measuring high power ultra-short laser pulse contrast |
| CN201935737U (en) * | 2010-12-30 | 2011-08-17 | 中国工程物理研究院激光聚变研究中心 | Laser pulse waveform measuring device |
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| CN102175334B (en) * | 2011-03-01 | 2014-01-08 | 复旦大学 | Pulse signal noise ratio (SNR) single shot measurement device based on anharmonic wave long wavelength sampling light |
| US20130322473A1 (en) * | 2012-06-01 | 2013-12-05 | Los Alamos National Security, Llc | Apparatus and method for measuring contrast in a high power laser system |
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| CN201166588Y (en) * | 2007-12-28 | 2008-12-17 | 中国科学院上海光学精密机械研究所 | Apparatus for measuring high power ultra-short laser pulse contrast |
| CN201935737U (en) * | 2010-12-30 | 2011-08-17 | 中国工程物理研究院激光聚变研究中心 | Laser pulse waveform measuring device |
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