CN103278249A - Quasi-near field picosecond pulse width diagnosis instrument - Google Patents
Quasi-near field picosecond pulse width diagnosis instrument Download PDFInfo
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- CN103278249A CN103278249A CN2013101798974A CN201310179897A CN103278249A CN 103278249 A CN103278249 A CN 103278249A CN 2013101798974 A CN2013101798974 A CN 2013101798974A CN 201310179897 A CN201310179897 A CN 201310179897A CN 103278249 A CN103278249 A CN 103278249A
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Abstract
A quasi-near field picosecond pulse width diagnosis instrument comprises a first iris diaphragm, a second iris diaphragm, a third iris diaphragm, a spectroscope, a first reflector, a second reflector, a third reflector, a fourth reflector, a fifth reflector, a self-correlation non-linear crystal, a cylindrical lens and a two-dimensional photodetector. The quasi-near field picosecond pulse width diagnosis instrument not only can measure the width of picosecond scale ultrashort pulses, but also has the function of quasi-near field analysis on measured pulses, can carry out fault analysis and cause finding in the process of measurement, and can increase the reliability and accuracy of measurement results.
Description
Technical field
The present invention relates to laser parameter diagnosis, particularly a kind of picopulse width diagnostic equipment.
Background technology
R.A.Ganeev has proposed autocorrelation method in nineteen ninety-five and has realized the original scheme (referring to Optics Communications, Vol.114,1995,432～434) that the ultrashort pulse time waveform is measured.M.Raghuramaiah calendar year 2001 perfect autocorrelation method measure the theoretical analysis method (referring to SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES, Vol.26,2001,603～611) of ultrashort pulse time waveform.Zhang Fuling has proposed in 2010 to produce the method that pulse front edge tilts based on grating, has effectively improved the measurement range of autocorrelation method.(referring to Chinese Optics Letters, Vol.8,2010,1053～1056).
Based on above research basis, the U.S. be concerned with company (Coherent Inc.) development commercial psec pulse width measure instrument SSA-P.This measuring instrument also only have a pulse width measure function, and owing to adopted optical grating construction at an optical arm of autocorrelation process, chirped pulse is produced strong effect weakening, can't realize the accurate measurement of chirped pulse.
Autocorrelation principle is measured in the pulsewidth process of ultrashort pulse, and the space distribution homogeneity of measured pulse is an important preposition key element.On the miniature laser device, this influence factor often is left in the basket.But clap in watt laser system in large-scale psec, this influence factor must be considered.Because large-scale psec is clapped watt laser system, passed through after the boosting amplification of neodymium glass amplifier chain, beam diameter has reached φ 310mm, and energy reaches 1700J.Heavy caliber like this, high-octane laser beam, because factors such as pumping is inhomogeneous, B integrating effects, the light distribution on its xsect is called for short in " near field " or " near field distribution ", is inhomogeneous, even a lot of defectives are arranged.This will have a strong impact on pulse width measure result's accuracy.But in the present prior art scheme, no matter be technical paper, or commercial instrument, all can't judge the pulse width variations in the large-scale psec bat watt laser system, be the regulating action owing to compressor reducer, still because variation has appearred in the near field homogeneity of tested light beam.
Summary of the invention
Problem to be solved by this invention is to provide a kind of accurate near field psec pulsewidth diagnostic equipment, this diagnostic equipment has not only been eliminated the spectrum effect weakening of the pulsewidth of warbling, realized the precision measurement of pulse width, and possessed accurate near field analytic function, can judge large-scale psec bat watt laser system, the failure cause in the pulse width measure process of high energy short pulse particularly improves reliability and the accuracy of measurement result.
Technical solution of the present invention is:
A kind of accurate near field psec pulsewidth diagnostic equipment, characteristics are that its formation comprises first iris, second iris, the 3rd iris, spectroscope, first catoptron, second catoptron, the 3rd catoptron, the 4th catoptron, the 5th catoptron, auto-correlation nonlinear crystal, cylindrical mirror and 2 D photoelectric detector, and the position relation of above-mentioned component is as follows:
Be first iris and spectroscope successively along tested picopulse direction, this spectroscope is divided into transmitted light and reflected light with described tested picopulse, be described second iris successively in described transmitted light direction, first catoptron, the 3rd iris and auto-correlation nonlinear crystal, be described second catoptron successively in described reflected light direction, the 3rd catoptron, the 4th catoptron and auto-correlation nonlinear crystal, the autocorrelation signal direction of exporting at described auto-correlation nonlinear crystal is described the 5th catoptron successively, cylindrical mirror and 2 D photoelectric sensitive detection parts.
Described spectroscope is metallic-membrane plating reflector or the polarization splitting prism of reflectivity R=50 ± 10%.
Described auto-correlation nonlinear crystal is BBO, LBO, KDP crystal.
Described 2 D photoelectric sensitive detection parts are scientific grade CCD, common CCD, CMOS camera.
Between described first iris and spectroscope, be provided with first coupled mirrors, second coupled mirrors.
Technique effect of the present invention is as follows:
The characteristics of the accurate near field of the present invention psec pulsewidth diagnostic equipment are: adopt bigbore autocorrelation process, obtain and time, Two dimensional Distribution autocorrelation signal that the locus is relevant, and by imagery of cylindrical mirror, this autocorrelation signal accurately is imaged onto on the 2 D photoelectric sensitive detection parts (CCD).Wherein, time shaft is positioned at surface level, and the curved surface direction of cylindrical mirror also is positioned at surface level, guarantees accuracy, the reliability of pulse-width data on the time shaft; Spatial axes is positioned at vertical plane, and cylindrical mirror does not have curvature in this direction, has avoided the image paradox in the simple lens imaging process, guarantees the intuitive of measurement data.This accurate near field psec pulsewidth diagnostic equipment has not only been realized the precision measurement of pulse width, and possessed accurate near field analytic function, can judge that large-scale psec claps the failure cause in the pulse width measure process of watt laser system, particularly high energy short pulse, improve reliability and the accuracy of measurement result.
The present invention claps watt laser system in large-scale psec, particularly in the pulse width measure process of high energy short pulse, when the compression grating remains unchanged, and when the pulse width measure data are unstable, common autocorrelation function analyzer can't be judged the instability source, but this psec pulsewidth diagnostic equipment can be found the near field distribution situation of change of measured pulse, provides failure reason analysis, and effective solution is provided.
Description of drawings
Fig. 1 is the structure diagram of the accurate near field of the present invention psec pulsewidth diagnostic equipment embodiment 1;
Fig. 2 is the structure diagram of the accurate near field of the present invention psec pulsewidth diagnostic equipment embodiment 2;
Fig. 3, Fig. 4, Fig. 5, Fig. 6 are that the accurate near field analytic function of this accurate near field psec pulsewidth diagnostic equipment is given an example.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, Fig. 1 is the structure diagram of the accurate near field of the present invention psec pulsewidth diagnostic equipment embodiment 1, as seen from the figure, the accurate near field of the present invention psec pulsewidth diagnostic equipment, comprise first iris 1, second iris 2, the 3rd iris 3, spectroscope 4, first catoptron 5, second catoptron 6, the 3rd catoptron 7, the 4th catoptron 8, the 5th catoptron 9, auto-correlation nonlinear crystal 10, cylindrical mirror 11 and ccd detector 12, the position relation of above-mentioned component is as follows:
Be first iris 1 and spectroscope 4 successively along tested picopulse direction, this spectroscope 4 is divided into transmitted light and reflected light with described tested picopulse, be described second iris 2 successively in described transmitted light direction, first catoptron 5, the 3rd iris 3 and auto-correlation nonlinear crystal 10, be described second catoptron 6 successively in described reflected light direction, the 3rd catoptron 7, the 4th catoptron 8 and auto-correlation nonlinear crystal 10 are described the 5th catoptrons 9 in described auto-correlation nonlinear crystal 10 output autocorrelation signal directions successively, cylindrical mirror 11 and 2 D photoelectric sensitive detection parts 12.
Described spectroscope 4 is metallic-membrane plating reflector or the polarization splitting prism of reflectivity R=50 ± 10%.
Described auto-correlation nonlinear crystal 10 is the KDP crystal.
Described 2 D photoelectric sensitive detection parts 12 are scientific grade CCD.
The nonlinear crystal 10 of present embodiment is of a size of 10 * 10mm, so the zone of action of autocorrelation process is φ 10mm.Because the angle between two optical arms of autocorrelation process is positioned at surface level, and the time parameter in the autocorrelation process determines by angle, so autocorrelation signal be the function of intensity-time in the horizontal direction, is used for the analysis pulsewidth.
In order to improve the measuring accuracy of time parameter, reduce the distorted signals that diffraction effect causes as far as possible, adopted the 5th catoptron 9 and cylindrical mirror 11 that the autocorrelation signal of nonlinear crystal 10 accurately is imaged onto on the described 2 D photoelectric sensitive detection parts.In the surface level of this accurate near field psec pulsewidth diagnostic equipment, beam size is φ 10mm, and the angle of non-colinear autocorrelation process is 55 °, and the magnification of imaging system is 1:1.8.Based on above light channel structure design, the temporal resolution in the horizontal direction of this accurate near field psec pulsewidth diagnostic equipment is 0.1ps, and reference time measurement is 18ps.
In the vertical direction is the function in intensity-space, is used for analyzing the homogeneity of near field distribution.Because nonlinear crystal 10 only is 181mm with the interval of 2 D photoelectric sensitive detection parts 12, and is very near, so the light distribution that obtains on the receiving plane of 2 D photoelectric detector 12 directly can reflect the light distribution of autocorrelation signal.Simultaneously, be inverted situation for fear of the image that the simple lens imaging process is introduced, so cylindrical mirror 11 do not have curvature in this direction, the imaging effect does not take place.Based on above analysis and light channel structure, the tested beam size in this accurate near field psec pulsewidth diagnostic equipment is φ 10mm, and the receiving plane of 2 D photoelectric sensitive detection parts 12 is of a size of 10.24 * 10.24mm, and the pixel number is 512 * 512, and pixel count is of a size of 20um.Therefore the resolution of its in the vertical direction is 20um, and observation scope is φ 10mm.Clap in the pulsewidth test experiments of watt laser system in psec, 310mm * 110mm ellipse light spot is transformed to 38.75mm * 13.75mm through the contracting beam system of 8:1, is constrained to φ 10mm light beam by this accurate near field psec pulsewidth diagnostic equipment then.Therefore the accurate near field resolution of corresponding psec bat watt laser beam is 160um, and the observation scope in accurate near field is 80mm.
This accurate near field psec pulsewidth diagnostic equipment embodiment 2 sees also Fig. 2.Between first iris 1 and spectroscope 4, place first coupled mirrors 13 and second coupled mirrors 14, the measured pulse of any direction incident can be coupled in the main body light path of follow-up diagnostic equipment.At first, first iris 1, second iris 2, the 3rd iris 3 are adjusted to φ 5mm circular hole, incident pulse is constrained to the light pencil of diameter phi 5mm, regulate first coupled mirrors 13, second coupled mirrors 14 then, make that second iris 2, the 3rd iris 3 in this light pencil and the subsequent optical path is coupled.At last, the bore of first iris 1, second iris 2, the 3rd iris 3 is adjusted to maximum, does not influence the measured pulse of incident.
Tested picopulse is through being divided into transmitted light beam and folded light beam after first iris 1, the spectroscope 4, transmitted light beam arrives and is used for auto-correlation nonlinear crystal 10 through second iris 2, first catoptron 5, the 3rd iris 3 backs, and folded light beam also arrives after through the 3rd catoptron 6, the 4th catoptron 7, the 5th catoptron 8 and is used for auto-correlation nonlinear crystal 10.The autocorrelation signal that is used for producing on the auto-correlation nonlinear crystal 10 is through arriving 12 imagings of 2 D photoelectric sensitive detection parts after the 5th catoptron 9, the cylindrical mirror 11.
Accurate near field analytic function is carried out in the imaging of this accurate near field psec pulsewidth diagnostic equipment, sees also Fig. 3～Fig. 6.When Fig. 3 stablizes for clapping a watt laser system hold mode, one group of test data of the tested light beam that accurate near field psec pulsewidth diagnostic equipment obtains, profile line has reflected the time-intensity distribution function on the horizontal direction.In 3 test results, the pulse-width data on the horizontal direction has consistance, and the accurate near field distribution on the vertical direction also remains unchanged, on-line testing stability RMSE＜3% of this accurate near field pulsewidth diagnostic equipment.In one group of test data of Fig. 4, clap the compression grating of watt laser system without any change, but variation has taken place in the pulse-width data on the horizontal direction in 3 test results.According to the accurate near field analytic function of this pulsewidth diagnostic equipment, violent variation has appearred in the locus-light intensity that can observe on the vertical direction, and namely variation has appearred in the near field distribution of measured pulse.In conjunction with the concrete structure of clapping watt laser system, further search failure cause, be because the gas leakage of vacuum compression chamber causes measured pulse to produce ionisation effect after measuring with the puncture of the focal plane position in contracting beam system air, influenced near field distribution.In one group of test data of Fig. 5, clap the compression grating of watt laser system also without any change, but the pulse-width data on the horizontal direction is changing also in 3 test results, and the accurate near field distribution of pulsewidth diagnostic equipment is also in synchronous variation.Find through further checking, in this measuring process, the vacuum compression chamber situation of not leaking gas, but damage has taken place in the rete of the sampling mirror of measured pulse, causes the near field distribution of measured pulse constantly to change.In one group of test data of Fig. 6, the compression grating of clapping watt laser system has carried out certain adjusting.In 3 test results, variation has taken place in pulse-width data on the horizontal direction, and the accurate near field distribution of in the vertical direction remains unchanged.The vacuum compression chamber situation of not leaking gas in this process, the rete of the sampling mirror of measured pulse is not damaged yet.Therefore measurement result is accurately, reliably.
Claims (5)
1. accurate near field psec pulsewidth diagnostic equipment, be characterised in that its formation comprises first iris (1), second iris (2), the 3rd iris (3), spectroscope (4), first catoptron (5), second catoptron (6), the 3rd catoptron (7), the 4th catoptron (8), the 5th catoptron (9), auto-correlation nonlinear crystal (10), cylindrical mirror (11) and 2 D photoelectric sensitive detection parts (12), the position relation of above-mentioned component is as follows:
Be first iris (1) and spectroscope (4) successively along tested picopulse direction, this spectroscope (4) is divided into transmitted light and reflected light with described tested picopulse, be described second iris (2) successively in described transmitted light direction, first catoptron (5), the 3rd iris (3) and auto-correlation nonlinear crystal (10), be described second catoptron (6) successively in described reflected light direction, the 3rd catoptron (7), the 4th catoptron (8) and auto-correlation nonlinear crystal (10), the autocorrelation signal direction that produces at described auto-correlation nonlinear crystal (10) is described the 5th catoptron (9) successively, cylindrical mirror (11) and 2 D photoelectric sensitive detection parts (12).
2. accurate near field according to claim 1 psec pulsewidth diagnostic equipment is characterized in that described spectroscope (4) is metallic-membrane plating reflector or the polarization splitting prism of reflectivity R=50 ± 10%.
3. accurate near field according to claim 1 psec pulsewidth diagnostic equipment is characterized in that described auto-correlation nonlinear crystal (10) is BBO, LBO, KDP crystal.
4. accurate near field according to claim 1 psec pulsewidth diagnostic equipment is characterized in that described 2 D photoelectric sensitive detection parts 12 are scientific grade CCD, common CCD, CMOS camera.
5. according to each described accurate near field psec pulsewidth diagnostic equipment of claim 1 to 4, it is characterized in that between described first iris (1) and spectroscope (4), being provided with first coupled mirrors (13), second coupled mirrors (14).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697647A (en) * | 2015-02-13 | 2015-06-10 | 中国科学院上海光学精密机械研究所 | Ultra-short pulse time waveform and chirp rate measuring device and method |
| CN104880258A (en) * | 2015-06-04 | 2015-09-02 | 中国科学院上海光学精密机械研究所 | Device and method for measuring near-field correlation pulse width of ultrashort optical pulses |
| CN112872581A (en) * | 2021-01-22 | 2021-06-01 | 华东师范大学 | Method and system for monitoring concurrent and simultaneous signals by CCD camera in real time |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697647A (en) * | 2015-02-13 | 2015-06-10 | 中国科学院上海光学精密机械研究所 | Ultra-short pulse time waveform and chirp rate measuring device and method |
| CN104697647B (en) * | 2015-02-13 | 2017-12-12 | 中国科学院上海光学精密机械研究所 | The time waveform of ultrashort pulse and the measurement apparatus of chirp rate and measuring method |
| CN104880258A (en) * | 2015-06-04 | 2015-09-02 | 中国科学院上海光学精密机械研究所 | Device and method for measuring near-field correlation pulse width of ultrashort optical pulses |
| CN104880258B (en) * | 2015-06-04 | 2018-01-12 | 中国科学院上海光学精密机械研究所 | Ultrashort light pulse near field associates pulse width measure device and measuring method |
| CN112872581A (en) * | 2021-01-22 | 2021-06-01 | 华东师范大学 | Method and system for monitoring concurrent and simultaneous signals by CCD camera in real time |
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Application publication date: 20130904 |