CN106342191B - A kind of method of time depend on spectra encoding measurement long pulse fine structure - Google Patents
A kind of method of time depend on spectra encoding measurement long pulse fine structureInfo
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- CN106342191B CN106342191B CN201218002787.7A CN201218002787A CN106342191B CN 106342191 B CN106342191 B CN 106342191B CN 201218002787 A CN201218002787 A CN 201218002787A CN 106342191 B CN106342191 B CN 106342191B
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Abstract
A kind of method of time depend on spectra encoding measurement long pulse fine structure, employing following steps are implemented: step 1: long-pulse laser to be measured is synchronizeed with the femto-second laser in ICF driver, make described long-pulse laser to be measured and the exomonental time synchronized of femto-second laser; Step 2: femto-second laser produces femtosecond pulse, and described femtosecond pulse is emitted to super continuous generation device, the supercontinuum that generation spectral width is hundreds of nanometers, and produced supercontinuum is emitted to grating stretcher; Step 3: described grating stretcher produces the suitable wide-band linearity chirped pulse of long pulse to be measured of pulsewidth and long-pulse laser to be measured generation; Step 4: described wide-band linearity chirped pulse and long pulse to be measured are incided in nonlinear crystal with certain nonlinear angle, in described nonlinear crystal, carry out and frequently, by produce with frequency impulse ejection to spectrometer measurement and pulse spectrum frequently; Step 5: the spatial structure that calculates long pulse to be measured.
Description
Technical field
The present invention relates to a kind of method of measuring long pulse fine structure, particularly a kind of time lightSpectral encoding is measured the method for long pulse fine structure.
Background technology
In the laser driver of inertial confinement fusion (ICF), amplitude-frequency effect can cause the strong of long pulseDegree modulation, and the destruction that these intensity modulated may cause optical component after amplifying. For opticsComponents and parts energy trouble free service, need to control the time domain strength characteristics of laser pulse, and its top priority justIt is the time domain strength characteristics that will measure accurately long pulse. In other long-pulse laser, forUnderstand true form and the characteristic of pulse, also need to measure the spatial structure of long pulse. Measure at presentThe method of long pulse spatial structure has high speed optoelectronic probe incorporated high-speed oscilloscope, and optical stripeCamera. The burst length resolution ratio that a kind of front method records is lower, and its temporal resolution is up to10ps left and right. And optic streak camera measurement window is less, be generally hundreds of psec left and right. At presentStill there is no to realize the pulse of high time precision (1ps left and right), large time window (> 1ns) simultaneouslyFine structure measuring method.
Summary of the invention
In order to overcome the deficiency of existing long pulse time domain fine structure measuring method, (precision is low, measurementWindow narrows), the present invention proposes to utilize time depend on spectra coding method to measure the fine structure of long pulse, canRealize pulsewidth and reach several ns, certainty of measurement is that the long pulse time domain fine structure of 1ps left and right is measured, andCan realize pulse single-shot and measure, for the measurement of single-shot long pulse fine structure provides desirable technology handSection.
Measuring method provided by the invention is: a kind of time depend on spectra encoding measurement long pulse fine structureMethod, it is characterized in that described method adopts following steps to implement:
Step 1: long-pulse laser to be measured is synchronizeed with the femto-second laser in ICF driver,Make described long-pulse laser to be measured and the exomonental time synchronized of femto-second laser;
Step 2: femto-second laser produces femtosecond pulse, and described femtosecond pulse is emitted to super companyContinuous generation device, the supercontinuum that generation spectral width is hundreds of nanometers, and by produced surpassingWhite light emission is to grating stretcher continuously;
Step 3: described grating stretcher produces the to be measured of pulsewidth and long-pulse laser to be measured generationThe wide-band linearity chirped pulse that long pulse is suitable;
Step 4: by described wide-band linearity chirped pulse and long pulse to be measured with certain nonlinear angleIncide in nonlinear crystal, in described nonlinear crystal, carry out and frequently, by produce with frequency arteries and veinsPunching is emitted to spectrometer measurement and frequency pulse spectrum;
Step 5: the spatial structure that calculates long pulse to be measured.
Further, described step 5 adopts following computational methods:
By with frequency pulse spectrum in the corresponding spectral intensity of each frequency f divided by wide-band linearity ZhouThe pulse spectrum of singing frequency is f-f0Time spectral intensity, and each frequency f of pulse spectrum and right frequentlyIt is right that the each quotient I answering forms (f, I), and and each frequency f and the long pulse to be measured of pulse spectrum frequentlyThe time t of time domain has f-2f0The one-to-one relationship of=β t, so it is right just to have derived (t, I), (t, I)To having described the time domain fine structure of long pulse to be measured, wherein f0For the centre frequency of long pulse to be measured,β is the linear coefficient of wide-band linearity chirped pulse.
Further, described super continuous generation device is white gem crystal.
Further, described nonlinear crystal is KDP crystal or the bbo crystal of part deuterate.
Further, the KDP crystal of described part deuterate is 12% to mix the KDP crystal of deuterium.
Further, the thickness of described nonlinear crystal is 100 μ m left and right.
The present invention adopts long pulse to be measured and synchronous linear-chirped-pulse and frequency, approximate according to small-signalUnder non-linear and Principle of Process frequently, and pulse strength is proportional to the intensity of two fundamental frequency pulses frequently, because ofThe intensity reflects of this and frequently pulse the intensity of pulse to be measured and the intensity of linear-chirped-pulse long-pending.And the intensity of linear-chirped-pulse is reflected by spectrum, can be by direct measure linear chirped pulseSpectrum obtain, therefore in this scheme the linear-chirped-pulse of incident and generation with frequency pulse strengthAll can be obtained by direct measure spectrum. Finally, the spatial structure of pulse to be measured can be by with frequency pulseThe acquisition of being divided by of the spectrum of spectrum and incident linear-chirped-pulse.
Conventionally ICF nanosecond pulse driver has all been equipped with synchronous with it femtosecond laser source. Femtosecond arteries and veinsPunching is by super continuous process, then passes through grating stretcher, can produce hundreds of nano spectral width,The linear-chirped-pulse of number nanosecond pulsewidth. And utilize at present ultra-thin (100 μ m thickness) part deuteriumKDP or the bbo crystal changed, can realize and frequently the ultra broadband position of process match (hundreds of nanometer).Meanwhile, the present invention adopts the synchronous linear-chirped-pulse of current high-precision spectrometer measurement and and frequency arteries and veinsThe spectrum of punching. These are that condition has been created in the time domain fine structure measurement of high accuracy, wide time window.
The inventive method is simple, time resolution high (～1ps), measurement window scope(> 1ns) greatly, both can measure monochromatic long pulse, can measure again certain bandwidth (bandwidth< 0.3nm) long pulse. The more important thing is the single-shot impulsive measurement that can realize the requirement of ICF driver.
Figure of description
Fig. 1 is the method schematic diagram of time depend on spectra encoding measurement long pulse fine structure of the present invention.
Detailed description of the invention
Embodiment as shown in Figure 1. Conventionally ICF driver has all been equipped with synchronous with it femtosecond and has swashedLight source. The femtosecond pulse that femto-second laser produces incides white gem crystal, produces spectral width and reachesTo the supercontinuum of hundreds of nanometers, and then utilize grating stretcher to produce pulsewidth and pulse to be measuredSuitable wide-band linearity chirped pulse.
Above-mentioned wide-band linearity chirped pulse and long pulse to be measured incide portion with certain nonlinear angleIn the KDP crystal of point deuterate and frequently. The 12% KDP crystal of mixing deuterium has a position of the turning back character that matches,The position that can realize ultra broadband matches. Meanwhile, with frequency process in, the nonlinear crystal of employingUltra-thin, be 100 about μ m, effectively strengthen the position bandwidth that matches. Should be at base with frequency processThat frequency laser almost carries out in lossless situation and frequently, what now produce is proportional to frequency light intensityTwo basic frequency laser intensity are long-pending. For linear-chirped-pulse, due to their frequency and timeLinear, the time domain strength information of pulse can obtain by ranging pulse spectrum. Due to productRaw and frequency pulse are also linear chrips, therefore the linear-chirped-pulse of incident and generation and frequentlyThe time domain intensity of pulse can obtain by the spectrum of measuring them. Because and process is at base frequentlyThat frequency laser almost carries out in lossless situation and frequently, thus the synchronous linear-chirped-pulse of outgoing andThe synchronous linear-chirped-pulse of incident is almost the same, by measuring the synchronous linear chrip of outgoingPulse spectrum can obtain the spectrum of the synchronous linear-chirped-pulse of incident. The time domain of long pulse to be measuredStructure can be by being divided by with frequency pulse spectrum and linear-chirped-pulse spectrum of recording in the following mannerObtain.
To warble divided by wide-band linearity with the corresponding spectral intensity of each frequency f in frequency pulse spectrumPulse spectrum frequency is f-f0(f0For the centre frequency of long pulse to be measured) time spectral intensity. WithFrequently each frequency f of pulse spectrum is right with corresponding each quotient I formation (f, I). And and pulsed light frequentlyEach frequency f of spectrum and the time t of long pulse time domain to be measured have f-2f0=β t (long pulse to be measured inFrequency of heart is identical with linear-chirped-pulse centre frequency hypothesis, and long pulse bandwidth to be measured is less and wideBandwidth with linear-chirped-pulse is very large, so do not need to consider the impact of long pulse bandwidth to be measured, βFor the linear coefficient of wide-band linearity chirped pulse) one-to-one relationship, so just derived (t, I)Right, (t, I) is to having described the time domain fine structure of long pulse to be measured.
This measuring method time resolution is determined by linear-chirped-pulse bandwidth and spectrometer resolution ratioFixed. Suppose that long pulse to be measured is quasi-monochromatic light, linear-chirped-pulse bandwidth is 300nm (middle cardiac waveLong is 1053nm), spectrometer resolution ratio is 0.1nm, if pulse to be measured is 3ns, itsTime resolution can reach 1ps; When long pulse pulsewidth to be measured is 1ns, its time measurement essenceDegree can reach 0.33ps.
Claims (5)
1. a method for time depend on spectra encoding measurement long pulse fine structure, described in it is characterized in thatMethod adopts following steps to implement:
Step 1: long-pulse laser to be measured is synchronizeed with the femto-second laser in ICF driver,Make described long-pulse laser to be measured and the exomonental time synchronized of femto-second laser;
Step 2: femto-second laser produces femtosecond pulse, and described femtosecond pulse is emitted to super companyContinuous generation device, the supercontinuum that generation spectral width is hundreds of nanometers, and by produced surpassingWhite light emission is to grating stretcher continuously;
Step 3: described grating stretcher produces wide-band linearity chirped pulse, Long Pulse LASER to be measuredDevice produces long pulse to be measured, the pulsewidth of described wide-band linearity chirped pulse and the pulsewidth of long pulse to be measuredQuite;
Step 4: by described wide-band linearity chirped pulse and long pulse to be measured with certain nonlinear angleIncide in nonlinear crystal, in described nonlinear crystal, carry out and frequently, by produce with frequency arteries and veinsPunching is emitted to spectrometer measurement and frequency pulse spectrum;
Step 5: the spatial structure that calculates long pulse to be measured;
Described step 5 adopts following computational methods:
By with frequency pulse spectrum in the corresponding spectral intensity of each frequency f divided by wide-band linearity ZhouThe pulse spectrum of singing frequency is f-f0Time spectral intensity, and each frequency f of pulse spectrum and right frequentlyIt is right that the each quotient I answering forms (f, I), and and each frequency f and the long pulse to be measured of pulse spectrum frequentlyThe time t of time domain has f-2f0The one-to-one relationship of=β t, so it is right just to have derived (t, I), (t, I)To having described the time domain fine structure of long pulse to be measured, wherein f0For the centre frequency of long pulse to be measured,β is the linear coefficient of wide-band linearity chirped pulse.
2. the method for time depend on spectra encoding measurement long pulse fine structure as claimed in claim 1, itsBe characterised in that described super continuous generation device is white gem crystal.
3. the method for time depend on spectra encoding measurement long pulse fine structure as claimed in claim 1, itsBe characterised in that described nonlinear crystal is KDP crystal or the bbo crystal of part deuterate.
4. the method for time depend on spectra encoding measurement long pulse fine structure as claimed in claim 3, itsThe KDP crystal that is characterised in that described part deuterate is 12% to mix the KDP crystal of deuterium.
5. the method for time depend on spectra encoding measurement long pulse fine structure as claimed in claim 1, itsThe thickness that is characterised in that described nonlinear crystal is 100 μ m.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111220285A (en) * | 2020-01-20 | 2020-06-02 | 中国科学院上海光学精密机械研究所 | Time-spectrum coding laser pulse time domain contrast single shot measuring device and method |
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2012
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111220285A (en) * | 2020-01-20 | 2020-06-02 | 中国科学院上海光学精密机械研究所 | Time-spectrum coding laser pulse time domain contrast single shot measuring device and method |
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