CN104697649B - Single-shot laser pulse detection device - Google Patents
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- CN104697649B CN104697649B CN201510093026.XA CN201510093026A CN104697649B CN 104697649 B CN104697649 B CN 104697649B CN 201510093026 A CN201510093026 A CN 201510093026A CN 104697649 B CN104697649 B CN 104697649B
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Abstract
The invention provides a single-shot laser pulse detection device, comprising: a detection light path for transmitting the base frequency detection light pulse; a reference optical path for transmitting the frequency-doubled reference optical pulse; a double pulse generator for obtaining double pulses having a first delay and transmitted collinearly along a reference optical path; an optical pulse converter for converting the double pulse into a series of sub-pulses in the form of double pulses which are mutually delayed in time, separated in space and propagated substantially in parallel; the pulse stretcher is used for translating each frequency component of the fundamental frequency detection optical pulse so as to stretch in a time domain; a disperser for spatially separating each frequency component in the fundamental frequency probe light pulse; and a plane detector for generating a third-order cross-correlation pulse signal by detecting the optical pulse and the sub-pulse from the fundamental frequency of the disperser. The invention can accurately measure the laser pulse waveform of the femtosecond beat tile and solves the problem of difficult diagnosis of the ultrafast and ultrastrong pulse with large dynamic range.
Description
Technical Field
The invention relates to the technical field of engineering optical application, in particular to a single-shot laser pulse detection device.
Background
Scientists at the university of Rochester in the past eighties have proposed Chirped Pulse Amplification (CPA) technology to enable ultra-high power ultrafast laser pulses (see D.Strickland and G.Mourou, Opt.Commun.56, 219 (1985). based on this principle technology, several laboratories have internationally obtained peak power breakthroughs PW (10 watts )15W) of the laser beam. How to measure the contrast of such lasers is a major concern and influence the development of the laser research.
In general, there are some noise pulses with relatively large intensity in the background signal of the amplified laser pulse, and their existence may adversely affect the results of the physical experiment. The excessively high pre-pulses can generate pre-plasmas on the target, the plasmas change the initial state of the plasmas when the main laser pulses interact with substances, the subsequent main pulses are disturbed or shielded and blocked, the subsequent main pulses cannot interact with the target, or the distribution of the subsequently reached main strong laser and the waveform thereof generate serious distortion, and the processing and analysis of experimental results can be seriously influenced. Therefore, the signal-to-noise ratio and the contrast ratio are important indexes of the ultrashort pulse laser and key indexes of the ultrashort pulse laser which are improved by engineers, and the accurate measurement and diagnosis of the PW pulse is a key technology for the generation and the application of the PW pulse. The time waveform (Temporal Profile), the signal-to-Noise Ratio (SNR), or the Temporal Contrast (Temporal Contrast) of the femtosecond PW laser is a key parameter for detection. In this regard, a definition of the signal-to-noise ratio was proposed In accordance with the requirements of physical experiments (see Li Ming, et. al, JOSA B, Vol.27issue 8, pp.1534-1542 (2010); D.M.Pennington, et. al, IEEE J.selected Topics In Quantum Electronics, Vol.6, No.4, (2000); H.M.Peng, et. al, In X-Ray Lasers, (feedback Industry Press, Beijing,1997) (In Chinese)) as follows:
wherein: the numerator term is the main pulse peak power, which is used as the reference point for the whole correlation measurement (correlation measurement). The denominator term is the maximum defined by a limit function from minus infinity to-100 ps or-10 ps (the minus sign of which indicates the leading edge time of the main pulse), which corresponds to some maximum on the step of the leading edge of the pulse. This prominent noise is inherent to the system, mainly from Amplified Spontaneous Emission (ASE) and pre-pulse (pre-pulse) of the pre-oscillator and amplifier non-linear effects and parametric fluorescence, etc. In the physical experiment of high field and high energy density, the signal to noise ratio of femtosecond panting laser at-100 ns, -20ns, -1ns, -100ps, -10ps (the negative sign of which represents the leading edge time of a main pulse) and the like is particularly concerned. They correspond to key criterion points of the physical laws, respectively. It was decided that to diagnose femtosecond panting laser pulses, it was necessary to measure intensity variations over 15 orders of magnitude with sufficient sensitivity and time spans from one hundred nanoseconds (10 ns)-9s) to several femtoseconds (10)-15s) all require sensitive sensingIt is sufficient to have a time window (temporal window) of 8 orders of magnitude.
However, this is far beyond the range of amplitude sensitivity and time window of conventional test probes, such as charge coupled device image sensors (CCD) and very high sensitivity and ultra fast time response photo detection devices photomultiplier tubes (PMT) with an amplitude span of at most 3 orders of magnitude and a time window span of at most 2 orders of magnitude, which makes it very difficult to test the signal-to-noise ratio of femtosecond PW pulses. Meanwhile, for high-field high-energy high-power pulse lasers, according to the prior art, the lasers in the world are operated at a very low repetition rate or even in a single-shot mode. The laser light output by such a laser, due to the randomness of spontaneous emission, as well as the randomness of parametric fluorescence, any fluctuations in the amplification chain will affect its output waveform. Therefore, the measurement of such a femtosecond beat laser requires a single shot measurement. Therefore, the key technical problem of single measurement of the signal-to-noise ratio of the beat-level ultrastrong laser pulse is as follows: 1) single shot measurements, rather than repetition frequency measurements; 2) the amplitude limitation of a large dynamic range of the detector is overcome; 3) overcoming the time window limit of the detector; 4) and (6) fidelity measurement. These in turn make the diagnosis of the shingle laser more difficult.
So far, commercial products suitable for femtosecond laser measurement are only stripe cameras, autocorrelators, Frequency-Resolved Optical switching (FROG) and Self-referenced Spectral Phase coherent Electric field Reconstruction (SPIDER) and their variants. Although hundreds of documents report these conventional ultrafast laser measurement methods, such as FROG, SPIDER measurement and application, basically only the measurement of a low power laser is involved. Moreover, repeated point-by-point scanning is required for measurement, and the point-by-point scanning method is time-consuming for measurement of low-repetition frequency pulses, and cannot be used for single-shot measurement in principle. Measurement methods involving large dynamic ranges and high sensitivity are also not complete. Although some variants of the apparatus can be used for single-shot measurement, it is limited to the method of using the sum frequency of two beams of light with large angle tilt to convert the time delay amount into the spatial position amount, and all of them need to be further researched and explored. At present, few reports are reported for a large dynamic range signal-to-noise ratio measuring method for single measurement at home and abroad, and the measuring method has no existing standard. Laboratories, colleges and research institutes of all big countries at home and abroad are all groped by themselves. It is necessary to continue to explore new approaches to accomplish this simultaneous requirement: a) a single measurement, b) an amplitude dynamic range of 10 orders of magnitude or more, c) a time window of 8 orders of magnitude, and d) a very challenging detection task of fidelity reliability.
Disclosure of Invention
It is an object of the present invention to provide a single-shot laser pulse detection apparatus that addresses at least one of the above-identified problems and deficiencies in the prior art.
In particular, the present invention provides a single-shot laser pulse detection apparatus for detecting a single-shot laser pulse to be detected, comprising:
a detection light path for transmitting a fundamental frequency detection light pulse; the fundamental frequency detection light pulse is formed by the laser pulse to be detected;
a reference optical path for transmitting the frequency-doubled reference optical pulse; the frequency doubling reference light pulse is formed by the laser pulse to be detected through frequency doubling treatment;
a double pulse generator disposed in the reference optical path for splitting two frequency doubled light pulses from the frequency doubled reference light pulse to obtain the frequency doubled reference light pulse in the form of a double pulse, the two frequency doubled light pulses having a first time delay therebetween and being transmitted collinearly along the reference optical path;
an optical pulse converter disposed in the reference optical path for converting the double-pulse version of the frequency-doubled reference optical pulse into a series of temporally delayed, spatially separated, and substantially parallel propagating sub-pulses, each of the sub-pulses being in the form of a double pulse;
the pulse stretcher is arranged in the detection optical path and used for translating each frequency component of the fundamental frequency detection optical pulse so as to stretch in a time domain;
a disperser disposed in the detection optical path for dispersing the stretched fundamental frequency detection optical pulse to spatially separate frequency components of the fundamental frequency detection optical pulse;
a plane detector for receiving the fundamental frequency detection light pulse from the disperser and the frequency doubled reference light pulse from the light pulse converter and generating a third order cross-correlation pulse signal of the fundamental frequency detection light pulse and the frequency doubled reference light pulse.
In one embodiment, the single-shot laser pulse detection apparatus may further include:
a beam splitter for splitting a first portion and a second portion from the laser pulse to be measured; wherein the first portion enters the probe optical path and the second portion enters the reference optical path.
In an embodiment, the single-shot laser pulse detection apparatus may further include a frequency doubling crystal for performing the frequency doubling on the laser pulse to be detected. In an embodiment, the laser pulse to be measured may be subjected to the frequency doubling treatment by the frequency doubling crystal and then incident to the optical splitter; the first part of the laser pulse to be detected comprises the fundamental frequency detection light pulse, and the second part of the laser pulse to be detected comprises the frequency doubling reference light pulse; or the frequency doubling crystal is positioned in the reference light path and is used for performing the frequency doubling treatment on the second part of the laser pulse to be detected to obtain the frequency doubling reference light pulse; wherein the first portion of the laser pulses to be detected includes the fundamental probe light pulses.
In one embodiment, the single shot laser pulse detection apparatus may further comprise a first spatial filter comprising a first telescope system; wherein the frequency doubling crystal is located at a focus of the first telescope system.
In one embodiment, the optical pulse converter may include a high-reflection mirror and a partial reflection mirror; the high reflecting mirror and the partial reflecting mirror are respectively in the shape of plane mirrors and are arranged in parallel in a face-to-face mode. In one embodiment, the plane detector may be disposed parallel to the high reflection mirror and the partial reflection mirror of the optical pulse converter.
In one embodiment, the double pulse generator may be a michelson interferometer or a fiber-optic circulator.
In one embodiment, the pulse stretcher may have a telescope system for compensating for higher-order dispersion related to beam size.
In one embodiment, the disperser may be a reflective or transmissive dispersion grating.
In one embodiment, the single-shot laser pulse detection apparatus may further include a parallel light generator for converting the dispersed fundamental probe light pulse into parallel light with an enlarged aperture and then incident on the planar detector; optionally, the parallel light generator is a spherical mirror or a cylindrical mirror, or a spherical lens or a cylindrical lens.
In one embodiment, the single-shot laser pulse detection apparatus may further include an optical path length adjuster, configured to adjust a difference between an optical path length of the fundamental frequency probe light pulse on the probe optical path and an optical path length of the frequency-doubled reference light pulse on the reference optical path; optionally, the optical path adjuster is disposed on the reference optical path, and configured to increase or decrease an optical path of the frequency-doubled reference optical pulse on the reference optical path.
In one embodiment, the single-shot laser pulse detection apparatus may further include: an attenuator disposed in the reference optical path for selectively attenuating the series of sub-pulses to different degrees, respectively, before the optical pulse is incident on the planar detector.
In one embodiment, the single-shot laser pulse detection apparatus may further include a second spatial filter disposed in the probe optical path for improving uniformity of the stretched fundamental probe light pulse; optionally, the second spatial filter comprises a second telescope system and a ceramic slit arranged at a focus of the second telescope system.
In one embodiment, the single-shot laser pulse detection apparatus may further include a third spatial filter, configured to form the laser pulse to be detected into a form of a super-gaussian flat-top beam; optionally, the third spatial filter comprises a third telescope system and a soft-edge pinhole disposed at a focus of the third telescope system.
In one embodiment, the first telescope system, the second telescope system, and/or the third telescope system can be a demagnifying telescope system.
In one embodiment, the planar detector may be a two-photon absorption surface detector or a sum frequency crystal.
In one embodiment, the planar detector may be arranged such that the fundamental detection light pulse and the frequency doubled reference light pulse generate therein a third order sum frequency pulse distribution.
In one embodiment, the single-shot laser pulse detection apparatus may further include a spatial imaging spectrometer for acquiring an interference fringe image corresponding to the third-order cross-correlation pulse signal.
In an embodiment, the single-shot laser pulse detection apparatus may further include an operator, configured to obtain a parameter of the laser pulse to be detected through a third-order correlation inversion operation according to the interference fringe image; the parameters include a time waveform and/or a signal-to-noise ratio.
The invention adopts the large-caliber optical pulse converter and the large-caliber plane detector to diagnose the femtosecond PW laser, and has at least the following advantages compared with the prior art:
1. the femtosecond PW laser is diagnosed by a large-caliber optical pulse converter and a large-caliber plane detector which are designed by adopting a film structure, so that input femtosecond pulses are converted into a pulse sequence which is arranged in a space coding mode and is subjected to time continuous discontinuous delay, the problem of a time window is converted into the problem of a pulse train on an optical caliber surface, and the intensity of a light beam is independent of the transverse size. The problems of high quality requirement on the pulse beam to be detected and requirement on large-caliber laser are avoided. With the addition of the tandem technique, a time window of up to 8 orders of magnitude measurements can be expected.
2. The problem of time window is converted into the problem of optical aperture by using a large aperture optical pulse converter. That is to say, the time delay is converted into the spatial distribution, and the main pulse and the front edge step noise of the femtosecond PW laser can be respectively attenuated in a spatial resolution mode by using measures such as spatial distribution differentiation, film structure design, partition neutral attenuation and the like, so that the amplitude diagnosis dynamic range is greatly improved. And by adding measures such as iterative algorithm calibration and the like, the amplitude dynamic range can be expected to reach more than 15 orders of magnitude of measurement. Meanwhile, the diagnosis of a large time window can be realized by utilizing the domestic existing processing technology.
3. The large-aperture optical pulse converter designed by a thin film structure is introduced, so that the pulses to be measured are separated in time and space, and the operation, attenuation, measurement and calibration can be separated. The signal-to-noise ratios of different time delays can be measured by separate operations; the peak power can be selectively inhibited and the sideband can be transmitted for measurement by separating attenuation, so that the measurement accuracy of noise is ensured; separate scaling also expands the measurement of amplitude dynamic range.
4. The large-aperture optical pulse converter and the large-aperture plane detector which are designed by adopting the film structure diagnose the femtosecond PW laser, and the input femtosecond pulse is converted to realize the measurement of 0 dispersion by adopting the film coherent design and the hollow interlayer design, so that the enough measurement bandwidth can be ensured, and the measurement is fidelity. Meanwhile, the structure can be realized by utilizing the domestic existing processing technology.
5. The femtosecond PW laser is diagnosed by adopting technologies such as the structure of two arms of a third-order correlator, the structural design of a film and the like, so that the embarrassment problem that the compatibility among light beams is greatly reduced due to the fact that the situation that the phase matching is difficult to guarantee and the phase matching is simultaneously met because a frequency doubling laser string and the fundamental frequency light to be detected are not intersected at the same position is avoided. Meanwhile, the problems that the optical path of the short-wavelength frequency doubling light is long and the optical components are damaged are solved.
6. By parallel design of the large-aperture optical pulse converter and the large-aperture plane detector, the embarrassment problem that when a sampling frequency doubling light laser string and base frequency light to be detected are incident into a third-order sum frequency generation crystal (THG) together, besides a third-order sum frequency effect, a strong coherent action can occur simultaneously is solved. And the problem that all hundreds of thousands of frequency doubling optical pulse trains and the fundamental frequency light meet the phase matching condition at the same time is very difficult to be solved. The greatest benefit of using a planar detector is that no phase matching is required, only space-time synchronization is required.
7. The method for recovering the coherent spectrum phase of the chromatographic spectrum is adopted to realize the accurate measurement of the waveform of the femtosecond panting laser pulse, and solves the problem of difficult diagnosis of the ultrafast and ultrastrong pulse with a large dynamic range.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic diagram of a single-shot laser pulse detection apparatus according to one embodiment of the present invention;
FIG. 2 is a schematic optical path diagram of a single-shot laser pulse detection apparatus according to embodiment 1 of the present invention;
FIG. 3 is a schematic optical path diagram of a single-shot laser pulse detection apparatus according to embodiment 2 of the present invention;
FIG. 4 is a schematic optical path diagram of a single-shot laser pulse detection apparatus according to embodiment 3 of the present invention;
FIG. 5 is a schematic optical path diagram of a single-shot laser pulse detection apparatus according to embodiment 4 of the present invention;
fig. 6 is a schematic optical path diagram of a single-shot laser pulse detection apparatus according to embodiment 5 of the present invention.
Detailed Description
It is known that the output pulse of the second order correlation can only be a symmetrical curve regardless of the original pulse shape, and therefore the signal-to-noise ratio of the front and back edges of the pulse cannot be judged. The asymmetric shape of the pulse can be measured by utilizing the third-order nonlinear effect, so that the pulse is selected as the signal-to-noise ratio measurement of the femtosecond PW laser pulse. And the efficiency of the third-order effect is not very low relatively, which is beneficial to improving the sensitivity of the test instrument. The principle of measurement based on the third-order correlator is correlation operation:
is achieved by third order Sum-Frequency generation (SFG). In the formula (2), the reaction mixture is,
is realized by nonlinear frequency multiplication process. Where τ is the relative delay introduced with respect to the two incident pulses, the time window corresponds to its start-stop range. The importance of measuring the femtosecond PW pulse phase in the test can be seen from the formulas (2) and (3). The nonlinear process is based on a three-wave nonlinear coupling principle, and under the approximation of slowly-varying amplitude, a forward transmission equation is as follows:
it can be seen from equation (4) that the nonlinear process of the femtosecond PW pulse is significantly different from the conventional nonlinear process. In addition to requiring wave vector mismatch Δ κ → 0, such that phase match Δ κ ═ 0, where the second left term indicates that there is also group velocity matching
And thus have unique properties. The measurement of the third order correlator is actually a generation of the third harmonicAnd the time measurement process, wherein the mathematical expression describes that the formula (3) is realized by the formula (4), and then the formula (2) is finally realized by the nonlinear process of the formula (4) of the laser pulse to be measured and the formula (3), and the triple frequency light is output for measurement. Although in the rough measurement, it is also reported that the signal-to-noise ratio of the fundamental light is replaced by the signal-to-noise ratio of the triple frequency light. However, as can be seen from the above process involving the transformation of the pulse under test I (ω, t) and the third-order cross-correlation I (3 ω, t) plane detector, it is preferable to use an iterative algorithm for calibration with respect to the (1) - (4) programming.
The third-order cross-correlation signal can be obtained by spectral shearing coherence. One incident beam of light may be split into two beams, one of which is passed through a linear spectral phase modulator and the other through a linear time domain phase modulator, which are then superimposed. The transfer function of a linear delay modulator is:
S＝exp(iωτ) (5)
in essence, an additional phase is modulated externally. The transfer function of a linear frequency shift modulator is:
N＝exp(-iΩt) (6)
it is a broadening frequency shift of the input pulse in the frequency domain. When two beams are overlapped together, interference occurs:
S(ω，τ)＝|E1(ω-Ω)exp(-iφ1(ω-Ω))+E2(ω)exp(-iφ2(ω))exp(iωτ)|2
＝|E1(ω-Ω)|2+|E2(ω)|2+2|E1(ω-Ω)|·|E2(ω)|·cos[φ1(ω-Ω)-φ2(ω)+ωτ] (7)
after frequency conversion and spectrum interference, the spectrum interference fringes of the two beams of light can be obtained by measuring with a spectrometer. From the interference fringes in the equation (7), the phase difference corresponding to the frequency can be directly arithmetically obtained: theta (omega) phi1(ω-Ω)-φ2(ω). Since the center frequency corresponds to the pulse maximum, its phase is generally flat, so that the phase of the entire spectrum can be determined from the phase at the center frequency. ByTherefore, the time waveform and the signal-to-noise ratio parameter of the femtosecond beat laser pulse to be measured can be measured by performing Fourier transform on the measurement spectrum and the spectrum phase.
On the basis of the principle of measurement of a third-order correlator, a chromatographic spectrum coherent spectrum phase restoration method is adopted, a plane detector is used for recording a cross-correlation image of a femtosecond beat laser pulse, the chromatographic spectrum coherent spectrum phase is iteratively calculated through a third-order correlation inversion program, and the time waveform and signal-to-noise ratio parameters of the femtosecond beat laser pulse to be measured are obtained.
The invention divides the laser pulse to be measured into two beams, one beam generates a frequency doubling reference light pulse of 2 omega by frequency doubling, and then forms a series of sub-pulses with double-pulse form, which are mutually delayed in time, mutually separated in space and basically propagated in parallel; and widening the other beam of the 1 omega fundamental frequency detection light pulse in a time domain, performing spectral separation, then enabling the 1 omega fundamental frequency detection light pulse and the 2 omega frequency doubling reference light pulse to jointly enter a nonlinear crystal insensitive to phase matching to generate a 3 omega sum frequency pulse train, and inverting by utilizing the characteristic of spatial separation to detect the time waveform and the signal-to-noise ratio parameters of the pulse to be detected with different time delays.
Fig. 1 is a schematic diagram of a single shot laser pulse detection apparatus according to one embodiment of the present invention. The single-shot laser pulse detection device may generally include a planar detector 103; a reference optical path 120, a double pulse generator 122, an optical path length adjuster 123, an optical pulse converter 124, and an attenuator 125 provided in the reference optical path 120; a detection light path 110, a pulse stretcher 111, a second spatial filter 112, a disperser 113 and a parallel light generator 114 arranged in the detection light path 110.
The detection optical path 110 is configured to transmit a fundamental detection optical pulse, and the fundamental detection optical pulse is formed by a laser pulse to be detected. The reference optical path 120 is configured to transmit a frequency doubling reference optical pulse, which is formed by frequency doubling the laser pulse to be measured. The double pulse generator 122 is configured to split two frequency doubled light pulses from the frequency doubled reference light pulse to obtain the frequency doubled reference light pulse in the form of a double pulse, the two frequency doubled light pulses having a first time delay therebetween and being transmitted collinearly along the reference optical path 120. The double pulse generator 122 may be selected as a michelson interferometer or a fiber optic reverberator.
The optical path length adjuster 123 is configured to adjust a difference between an optical path length of the fundamental frequency detection light pulse on the detection light path 110 and an optical path length of the frequency doubling reference light pulse on the reference light path 120. In this embodiment, an optical path adjuster 123 is disposed on the reference optical path 120, and is configured to increase or decrease the optical path length of the frequency-doubled reference optical pulse on the reference optical path 120. In other embodiments, the optical detection path 110 may or may not be disposed. The optical pulse converter 124 is configured to convert the double frequency reference optical pulse in the form of a double pulse into a series of sub-pulses that are delayed in time from each other, separated in space from each other, and propagated substantially in parallel, each sub-pulse being in the form of a double pulse. The attenuator 125 is used to selectively attenuate each of the series of sub-pulses to a different degree before the frequency-doubled reference light pulse is incident on the planar detector. The pulse stretcher 111 is used to translate each frequency component of the fundamental probe optical pulse, thereby stretching in the time domain. The pulse stretcher may have a telescope system for compensating for high-order dispersion related to beam size. The second spatial filter 112 is used to improve the uniformity of the broadened fundamental frequency probe light pulses. The second spatial filter may include a second telescope system and a ceramic slit disposed at a focal point of the second telescope system.
The disperser 113 is configured to disperse the stretched fundamental frequency probe light pulse to spatially separate frequency components of the fundamental frequency probe light pulse. The disperser 113 may be a reflective or transmissive dispersion grating. The parallel light generator 114 is configured to convert the dispersed fundamental frequency detection light pulse into parallel light with an enlarged aperture, and then the parallel light is incident on the planar detector 103. The parallel light generator 114 can be a spherical mirror or a cylindrical mirror, or a spherical lens or a cylindrical lens. The plane detector 103 is configured to receive the fundamental probe light pulse from the parallel light generator 114 and the frequency doubled reference light pulse from the light pulse converter 124, and generate a third order cross-correlation pulse signal of the fundamental probe light pulse and the frequency doubled reference light pulse. The flat panel detector 103 may be a two-photon absorption surface detector. The two-photon absorption surface detector may be configured such that the fundamental probe light pulse and the frequency doubled reference light pulse produce a third order sum frequency pulse distribution therein. In other embodiments, the planar detector may also be a semiconductor surface detector, a sum frequency crystal, a large-caliber KDP crystal, a microchannel plate MCP detector, a light frequency conversion microchannel plate MCP detector, or a fluorescent functional glass, for example. The planar detector may be arranged such that the fundamental detection light pulse and the frequency doubled reference light pulse generate therein a third order sum frequency pulse distribution.
In the embodiment shown in fig. 1, an optical splitter 102 may be further included for splitting the first portion and the second portion from the laser pulse to be measured; wherein a first portion enters the detection optical path 110 and a second portion enters the reference optical path 120. In this embodiment, a frequency doubling crystal for frequency doubling the laser pulse to be measured may be further included. Further, a first spatial filter 121 or 121' for use with a frequency doubling crystal may also be included. The first spatial filter comprises a first telescope system; wherein, the frequency doubling crystal is positioned at the focus of the first telescope system. A first spatial filter may be provided before the beam splitter 102, as indicated at 121' in fig. 1. Laser pulses to be detected are subjected to frequency doubling treatment by the frequency doubling crystal and then enter the optical splitter 102, frequency doubling light pulses emitted by the frequency doubling crystal are distributed to the reference light path 120 by the optical splitter 102 to be transmitted as frequency doubling reference light pulses, and fundamental frequency light is distributed to the detection light path 110 by the optical splitter 102 to be transmitted as fundamental frequency detection light pulses. The first spatial filter may also be arranged in the reference beam path 120 after the beam splitter 102, as indicated at 121 in fig. 1. The laser pulse to be measured is divided into two optical pulses by the optical splitter 102, one optical pulse is transmitted to the detection optical path 110 as a fundamental frequency detection optical pulse, and the other optical pulse is transmitted to the reference optical path 120 to form a frequency doubling light by the frequency doubling crystal, and the frequency doubling light is transmitted in the reference optical path 120 as a frequency doubling reference optical pulse.
In this embodiment, a third spatial filter 101 may be further included for forming the laser pulse to be measured into the form of a super-gaussian flat-top beam. The third spatial filter 101 may be arranged before the beam splitter 102. The third spatial filter may include a third telescope system and a soft-edge aperture disposed at a focus of the third telescope system.
In the embodiment shown in fig. 1, the first spatial filter, the second spatial filter 112, the third spatial filter 101, the optical path length adjuster 123, the attenuator 125, and the parallel light generator 114 are not essential components of the single-shot laser pulse detection apparatus of the present invention, but may be included in a preferred embodiment.
In one embodiment, the first telescope system, the second telescope system, and/or the third telescope system is a demagnifying telescope system. In one embodiment, a spatial imaging spectrometer and/or an operator may also be included. The spatial imaging spectrometer is used for acquiring an interference fringe image corresponding to the third-order cross-correlation pulse signal. The arithmetic unit is used for obtaining parameters of the laser pulse to be measured, such as time waveform and/or signal-to-noise ratio, and the like through third-order correlation inversion operation according to the interference fringe image.
In one embodiment, the optical pulse converter 124 may include a high-reflection mirror and a partial reflection mirror; the high reflecting mirror and the partial reflecting mirror are respectively in the shape of plane mirrors and are arranged in parallel facing each other. The plane detector 103 may be disposed parallel to the high-reflection mirror and the partial reflection mirror of the light pulse converter 124.
In the invention, because of single pulse measurement, in order to enlarge the dynamic range of amplitude and enlarge the time window of measurement, a specially designed large-caliber optical pulse converter is adopted, the pulse to be measured generates separated pulse strings in time and space, and the three-order correlation measurement is adopted one by one; due to the adoption of the plane detector, the uniqueness of a detection result is ensured by the two-dimensional image, and the signal-to-noise ratio of the pulse to be detected with different time delays can be detected at one time.
When the single-shot laser pulse detection device is designed, the dispersion of all optical components is ensured to be small enough to be ignored or the distortion of the fundamental frequency detection light pulse and the frequency doubling reference light pulse on the generation time or space is avoided as much as possible; (2) the phase matching bandwidth is enough to ensure that the femtosecond light is not stretched or compressed; in order to prevent the distortion of the measurement result caused by the occurrence of the 'emptying' effect in the interaction of the frequency doubling effect and the three waves, the conversion efficiency must be kept low; (3) in single pulse measurements, the beam intensity is made independent of the lateral (x, y) dimension, among other things; (4) in the collinear correlation, it is necessary to ensure that the frequency-doubled reference light pulse and the fundamental frequency probe light pulse are strictly coincident. Meanwhile, the measuring instrument is required to have sufficient sensitivity, and a third-order nonlinear process of sum frequency or difference frequency or four-wave mixing is adopted to obtain a relevant signal due to the fact that a large tolerance is required for phase mismatch in the third-order nonlinear process.
Several embodiments are shown below to illustrate the specific implementation of the single-shot laser pulse detection apparatus shown in fig. 1 in the optical path.
Example 1
As shown in fig. 2, the computer 100 controls the trigger 85 to trigger the pulse generator (not shown in the figure) to generate a single laser pulse to be detected, and the computer 100 controls the time for opening the electrical Shutter 1, so that when the laser pulse to be detected passes through the electrical Shutter 1(Shutter), the single laser pulse detector and the pulse generator operate synchronously, thereby reducing stray light in the instrument and improving the signal-to-noise ratio of the instrument. Then, the laser pulse to be detected is polarized and deflected by 45 degrees through the half wave plate 2 so as to adjust the light splitting ratio; then passing through a third Spatial Filter (Spatial Filter) consisting of the spherical mirror 41, the soft edge diaphragm ceramic aperture 71 and the spherical mirror 42, wherein the soft edge diaphragm ceramic aperture 71 is arranged at the focus of the third Spatial Filter, so that the laser pulse to be measured is changed into a super-Gaussian flat-top beam, and the beam aperture is enlarged by M1 times; the laser pulse to be measured is divided into two paths by the proportional beam splitter 321: the upper arm p-polarized reference path and the lower arm s-polarized probe path.
The upper arm p-polarized reference light path passes through a first spatial filter consisting of a spherical mirror 43, a nonlinear crystal LBO crystal 72 and a spherical mirror 44, and a class I matching (ooe) nonlinear LBO crystal is arranged in front of a focus to generate frequency multiplication output; the spherical mirror 44 is a dichroic coated mirror, which filters out o-polarized fundamental frequency light 1 ω and reflects e-polarized frequency doubled light 2 ω; at this time, the corresponding upper arm p-polarized light becomes s-polarized frequency doubling reference light pulse; a double-pulse generator which comprises a double-path beam splitter 731, a plane mirror 51 and a plane mirror 52 to form a Delay Line 1(Optical Delay Line1), and a double-pulse generator which comprises the double-path beam splitter 731, a plane mirror 53 and a plane mirror 54 to form a Delay Line 2(Optical Delay Line2) generates double-pulse reference light pulses which have two different delays and are transmitted in a collinear way, and prepares for generating interference fringes by applying a SPIDER technology; the double pulse generator here is a michelson interferometer. Then, the optical path difference between the reference optical path and the detection optical path is consistent through an optical path regulator (actually equivalent to a delay line with adjustable length) consisting of plane reflectors 55, 56, 57 and 58; after being reflected by the plane mirror 59 and the plane mirror 60, the light is incident on the specially designed proportional time-delay light-splitting mirror 40 to convert the double-pulse frequency-multiplication reference light pulse into a series of sub-pulses which are mutually delayed in time, separated in space and basically propagated in parallel, wherein each sub-pulse is in a double-pulse form; the proportional time-delay and partial-reflection mirror 40 here includes a high reflection mirror and a partial reflection mirror; the high reflecting mirror and the partial reflecting mirror are respectively in the shape of plane mirrors and are arranged in parallel facing each other. These sub-pulses in the form of a series of double pulses emitted from the proportional time-delay light-splitting mirror 40 are attenuated to different degrees by the attenuator 6, and the attenuator 6 can be driven by the electric motor 5 of the attenuator 6 to move up and down relative to the emission plane of the proportional time-delay light-splitting mirror 40, so as to change the degree of attenuation of the sub-pulses in the form of a series of double pulses. And the attenuated series of sub-pulses in the form of double pulses wait for the fundamental frequency detection light pulse of the lower arm detection light path to realize correlation operation.
The detection light path of the lower arm s polarization is reflected by the plane mirror 61, and is incident on a pulse stretcher consisting of a reflection grating 81, a spherical mirror 45 or a cylindrical mirror 45 and a plane mirror 50, so that linear chirp stretching is generated. The pulse Stretcher here is an Offner Stretcher (Offner Stretcher). Then, a second spatial filter (equivalent to a telescope system) consisting of the cylindrical mirror 46, the ceramic slit 73 and the cylindrical mirror 47 is used, the ceramic slit 73 is arranged in front of a focus, so that the imaging spectrum is uniform, and the beam aperture M3 times is enlarged; the formed uniform light beam is projected on a disperser formed by a reflection grating 82 and then is projected on a large-caliber two-photon absorption surface detector 66 or a large-caliber KDP in parallel through a spherical mirror 48 or a cylindrical mirror 48; the reflection grating 81 and the reflection grating 82 generate chirp pulses with adjustable time delay, and a series of double-pulse-form sub-pulses on the upper arm are waited to realize related operations on the large-aperture two-photon absorption surface detector 66.
The fundamental frequency detection light pulse and the frequency doubling reference light pulse can be synchronized in time on the large-caliber two-photon absorption surface detector 66 or the large-caliber KDP by adjusting the electric motor 70 of the optical path regulator, so that the two-photon absorption surface detector 66 obtains the maximum signal output. The greatest advantage of using a two-photon absorption surface is that no phase matching is required, only time-space synchronization is required (while KDP requires that all pulse trains simultaneously satisfy the phase matching condition, so that debugging is difficult, and it is very difficult to make a large-caliber KDP). Meanwhile, in order to better achieve phase matching with a large angle and a large bandwidth and enable the output third-order signal 3 omega to be strongest, the face detection imaging device needs to be carefully designed. The imaging lens 80 is used for imaging, the spatial imaging spectrometer 90 is used for recording, the computer 100 is used for collecting data, and iterative deconvolution operation is carried out to obtain the pulse waveform and the signal-to-noise ratio characteristic of the laser to be measured.
After the optics are calibrated, a single pulse measurement can be taken. Real-time detection may be performed. In addition, the spatial filter is not necessarily used for expanding beams, and can also be used for contracting beams; in the invention, because of the requirement of a three-order nonlinear process, the beam-shrinking application is more feasible, and the input light beam is required to have a larger aperture. Also, these three spatial filters are not necessary, only for optimal settings. If the three spatial filters are cancelled, the scheme is still used, but the third-order correlation operation is carried out on the light beams with Gaussian distribution at the moment, and the algorithm needs to be modified.
Example 2
As shown in fig. 3, the computer 100 controls the trigger 85 to trigger the pulse generator (not shown in the figure) to generate a single laser pulse to be detected, and the computer 100 controls the opening time of the electrical shutter 1, so that the single laser pulse detector and the pulse generator operate synchronously when the laser pulse to be detected passes through the electrical shutter 1, thereby reducing stray light in the instrument and improving the signal-to-noise ratio of the instrument. Then, the laser pulse to be measured is polarized and deflected through the half wave plate 2 so as to adapt to the phase matching requirement of a nonlinear crystal (ooe) and adjust the light splitting ratio; then, the light is converged to the nonlinear frequency doubling crystal 371 through the lens 20 to generate frequency doubling light, so that the fundamental frequency light and the frequency doubling light are just perpendicular to each other, and the input pulse is divided into two paths through the proportional beam splitter 321: the upper arm p-polarized frequency multiplication reference optical path and the lower arm s-polarized fundamental frequency detection optical path.
The upper arm p-polarized reference path, reflected by the plane mirror 94; a double-pulse generator which comprises a double-path spectroscope 731 and plane reflectors 51 and 52 to form a Delay Line 1(Optical Delay Line1), and a double-pulse generator which comprises the double-path spectroscope 731 and the plane reflectors 53 and 54 to form a Delay Line 2(Optical Delay Line2) generates frequency-doubled reference light pulses which have two different Delay forms and are transmitted in a collinear way, and the SPIDER technology is used for preparing for generating interference fringes; after passing through a half of the glass slide 3, the optical path difference between the reference optical path and the detection optical path is consistent through an optical path regulator consisting of plane reflectors 55, 56, 57 and 58; reflected by the plane mirror 59 and the spherical mirror 98, and then incident on the specially designed proportional time-delay light-splitting mirror 40 to convert the double-pulse frequency-multiplication reference light pulse into a series of sub-pulses which are mutually delayed in time, separated in space and propagated substantially in parallel, wherein each sub-pulse is in a double-pulse form; the proportional time-delay time-division reflecting mirror 40 here includes a high reflecting mirror and a partial reflecting mirror; the high reflecting mirror and the partial reflecting mirror are respectively in the shape of plane mirrors and are arranged in parallel facing each other. These sub-pulses in the form of a series of double pulses emitted from the proportional time-delay light-splitting mirror 40 are attenuated to different degrees by the attenuator 6, and the attenuator 6 can be driven by the electric motor 5 of the attenuator 6 to move up and down relative to the emission plane of the proportional time-delay light-splitting mirror 40, so as to change the degree of attenuation of the sub-pulses in the form of a series of double pulses. And the attenuated series of sub-pulses in the form of double pulses wait for the fundamental frequency detection light pulse of the lower arm detection light path to realize correlation operation.
The detection beam path of the lower arm s polarization passes through the beam splitter 33, then passes through the faraday cylinder 97, and is projected onto the transmission grating 91 and the transmission grating 93 for diffraction, and finally reflected by the plane mirror 92, so that the pulse Stretcher constituted by the transmission grating 91, the transmission grating 93 and the plane mirror 92 is stretched, in this embodiment, the pulse Stretcher is a Negative group velocity dispersion Stretcher (Negative GVD Stretcher). The light returns after being stretched and then passes through a Faraday cylinder 97, so that the emergent light and the incident light are just polarized and vertical to each other; then reflected by the beam splitter 33, and projected to the reflecting mirror 95 and the reflecting mirror 96 for reflection; a uniform light beam is formed by a second spatial filter consisting of a lens 21, a slit 73 and a lens 22 and is projected on a disperser consisting of a transmission grating 83, and is projected on a large-aperture two-photon absorption surface detector 66 in parallel by a lens 35 (a spherical or cylindrical lens); the chirped pulses with adjustable time delay generated by the gratings 91 and 93 and the transmission grating 83 wait for a series of double-pulse sub-pulses on the upper arm to realize related operations on the large-caliber two-photon absorption surface detector 66.
The optical path difference between the detection optical path and the reference optical path can be consistent by adjusting the electric motor 70 of the optical path adjuster, so that the time synchronization of the fundamental frequency detection optical pulse and the frequency doubling reference optical pulse on the large-caliber two-photon absorption surface detector 66 is realized, and the two-photon absorption surface detector 66 obtains the maximum signal output. The imaging lens 80 images the laser pulse waveform to be measured and the signal-to-noise ratio characteristic are obtained by recording the laser pulse waveform by the spatial imaging spectrometer 90, acquiring data by the computer 100 and carrying out iterative deconvolution operation.
Example 3
As shown in fig. 4, the computer 100 controls the trigger 85 to trigger the pulse generator (not shown in the figure) to generate a single laser pulse to be detected, and then the computer 100 controls the opening time of the electrical shutter 1, so that the single laser pulse detector and the pulse generator operate synchronously when the laser pulse to be detected passes through the electrical shutter 1, thereby reducing stray light in the instrument and improving the signal-to-noise ratio of the instrument. Then, the laser pulse to be measured is polarized and deflected through the half wave plate 2 so as to adapt to the phase matching requirement of a nonlinear crystal (ooe) and adjust the light splitting ratio; then, the light is converged to the nonlinear frequency doubling crystal 371 through the lens 20 to generate frequency doubling light, so that the fundamental frequency light and the frequency doubling light are just perpendicular to each other, and the input pulse is divided into two paths through the proportional beam splitter 321: the upper arm p-polarized frequency multiplication reference optical path and the lower arm s-polarized fundamental frequency detection optical path.
Wherein the reference optical path of the upper arm p-polarization is the same as that in embodiment 2.
The detection light path of the lower arm s polarization passes through the beam splitter 33 and then through the Faraday cylinder 97 to be projected to be widened on a pulse stretcher consisting of a reflection grating 99, a lens 23, a lens 24, a reflection grating 81 and a plane mirror 92; the pulse Stretcher here is a Martinez Stretcher (Martinez Stretcher). The expanded light returns to the Faraday cylinder 97 to be emitted after rotating, and the emergent light is just vertical to the polarization of the incident light; and then reflected by the beam splitter 33; projected to the reflecting mirrors 95, 96 and reflected; a uniform light beam is formed by a second spatial filter consisting of a lens 21, a slit 73 and a lens 22 and is projected on a diffuser consisting of a reflection grating 82, and is projected on a large-aperture two-photon absorption surface detector 66 in parallel through a cylindrical mirror 48; the chirp pulse with adjustable time delay generated by the reflection gratings 99 and 81 and the reflection grating 82 waits for a series of double-pulse sub-pulses on the upper arm to realize related operations on the large-aperture two-photon absorption surface detector 66.
The optical path difference between the detection optical path and the reference optical path can be consistent by adjusting the electric motor 70 of the optical path adjuster, so that the time synchronization of the fundamental frequency detection optical pulse and the frequency doubling reference optical pulse on the large-caliber two-photon absorption surface detector 66 is realized, and the two-photon absorption surface detector 66 obtains the maximum signal output. The imaging lens 80 images the laser pulse waveform to be measured and the signal-to-noise ratio characteristic are obtained by recording the laser pulse waveform by the spatial imaging spectrometer 90, acquiring data by the computer 100 and carrying out iterative deconvolution operation.
Example 4
As shown in fig. 5, the optical path shown in this embodiment is identical to that of embodiment 3 except for the difference of the pulse stretcher.
The pulse stretcher in fig. 5 is another form of negative group velocity dispersion stretcher composed of a reflection grating 99, a reflection grating 81, and a plane mirror 92. The detection light path of the lower arm s polarization passes through the beam splitter 33 and then the Faraday cylinder 97, and is projected to a pulse stretcher consisting of a reflection grating 99, a reflection grating 81 and a plane mirror 92 to be widened; the expanded light is emitted after rotating through a Faraday cylinder 97, and the emergent light is just vertical to the polarization of incident light; and then reflected by the beam splitter 33; projected to the reflecting mirrors 95, 96 and reflected; the uniform beam is projected onto a diffuser formed by a reflection grating 82 through a second spatial filter formed by a lens 21, a slit 73 and a lens 22, and is projected in parallel onto a large-diameter two-photon absorption surface detector 66 through a cylindrical mirror 48.
Example 5
As shown in fig. 6, the optical path shown in this embodiment is different from that of embodiment 3 in the pulse stretcher and the disperser in the detection optical path of the lower arm s polarization.
In the present embodiment, the pulse Stretcher is a Positive group velocity dispersion Stretcher (Positive GVD Stretcher) composed of the prisms 34, 77 and the plane mirror 92. The disperser consists of a transmission grating. The specific optical path is as follows:
the polarized detection light path of the lower arm s passes through the beam splitter 33 and then the Faraday cylinder 97, projects the detection light path to the prisms 34 and 77 for scattered diffraction, and then is reflected by the plane mirror 92; the expanded light is emitted after rotating through a Faraday cylinder 97, and the emergent light is just vertical to the polarization of incident light; and then reflected by the beam splitter 33; projected to the reflecting mirrors 95, 96 and reflected; the formed uniform beam is projected onto a diffuser formed by a transmission grating 83 through a second spatial filter formed by a lens 21, a slit 73 and a lens 22, and is projected in parallel onto a large-aperture two-photon absorption surface detector 66 through a lens 35.
In other embodiments, the pulse stretcher in embodiments 1-5 can be replaced by other forms of Martinez stretcher, positive group velocity dispersion stretcher and negative group velocity dispersion stretcher, and can also be replaced by coated bulk material stretcher, nonlinear fiber or photonic crystal fiber stretcher, positive dispersion fiber stretcher, chirped fiber stretcher, fiber bragg grating stretcher, stretcher consisting of short nonlinear chirped fiber grating stretcher and long linear chirped fiber grating stretcher, dual fiber bragg grating stretcher, and the like. The double pulse generators of examples 1-5 can be replaced with fiber-optic reverberators. The beam splitters in embodiments 1-5 can be replaced with fiber optic proportional beam splitters.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A single-shot laser pulse detection device for detecting a single shot of laser pulses to be detected, comprising:
a detection light path for transmitting a fundamental frequency detection light pulse; the fundamental frequency detection light pulse is formed by the laser pulse to be detected;
a reference optical path for transmitting the frequency-doubled reference optical pulse; the frequency multiplication reference light pulse is formed by the laser pulse to be detected through frequency multiplication treatment;
a double pulse generator disposed in the reference optical path for splitting two frequency doubled light pulses from the frequency doubled reference light pulse to obtain the frequency doubled reference light pulse in the form of a double pulse, the two frequency doubled light pulses having a first time delay therebetween and being transmitted collinearly along the reference optical path;
an optical pulse converter disposed in the reference optical path for converting the double-pulse version of the frequency-doubled reference optical pulse into a series of temporally delayed, spatially separated, and substantially parallel propagating sub-pulses, each of the sub-pulses being in the form of a double pulse;
a pulse stretcher arranged in the detection light path and used for translating each frequency component of the fundamental frequency detection light pulse so as to stretch in a time domain;
a disperser disposed in the detection optical path for dispersing the stretched fundamental frequency detection light pulse to spatially separate frequency components of the fundamental frequency detection light pulse;
a plane detector for receiving the fundamental frequency detection light pulse from the disperser and the frequency doubled reference light pulse from the light pulse converter and generating a third order cross-correlation pulse signal of the fundamental frequency detection light pulse and the frequency doubled reference light pulse.
2. The apparatus of claim 1, further comprising:
a beam splitter for splitting a first portion and a second portion from the laser pulse to be measured; wherein the first portion enters the probe optical path and the second portion enters the reference optical path; and
and the frequency doubling crystal is used for carrying out frequency doubling treatment on the laser pulse to be detected.
3. The apparatus of claim 1, further comprising:
a first spatial filter comprising a first telescope system;
wherein the frequency doubling crystal is located at a focus of the first telescope system.
4. The apparatus of claim 1, further comprising:
the optical pulse converter comprises a high reflector and a partial reflector; the high reflecting mirror and the partial reflecting mirror are respectively in the shape of plane mirrors and are arranged in parallel in a face-to-face mode.
5. The apparatus of claim 1, further comprising:
the plane detector is disposed parallel to the high reflection mirror and the partial reflection mirror of the optical pulse converter.
6. The apparatus of claim 1, further comprising:
the pulse stretcher has a telescope system for compensating for high-order dispersion.
7. The apparatus of claim 1, further comprising:
and the parallel light generator is used for converting the dispersed fundamental frequency detection light pulse into parallel light with enlarged caliber and then transmitting the parallel light to the plane detector.
8. The apparatus of claim 1, further comprising:
and the optical path regulator is used for regulating the difference between the optical path of the fundamental frequency detection light pulse on the detection optical path and the optical path of the frequency doubling reference light pulse on the reference optical path.
9. The apparatus of claim 1, further comprising:
an attenuator disposed in the reference optical path for selectively attenuating the series of sub-pulses to different degrees, respectively, prior to the light pulse being incident on the planar detector;
a second spatial filter disposed in the detection optical path for improving uniformity of the broadened fundamental detection light pulses; and/or
And the third spatial filter is used for enabling the laser pulse to be detected to be formed into a super-Gaussian flat-top beam.
10. The apparatus of claim 1, further comprising:
the spatial imaging spectrometer is used for acquiring an interference fringe image corresponding to the third-order cross-correlation pulse signal; and
the arithmetic unit is used for obtaining the parameters of the laser pulse to be detected through three-order correlation inversion operation according to the interference fringe image; the parameters of the laser pulse to be detected comprise a time waveform and/or a signal-to-noise ratio.
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| CN107205103B (en) * | 2017-04-14 | 2020-02-14 | 华东师范大学 | Ultra-high speed compression photographic device based on compressed sensing and stripe camera principle |
| CN107421639B (en) * | 2017-05-05 | 2023-09-29 | 安徽谱泉光谱科技有限公司 | Plasma three-dimensional information diagnosis system in material surface treatment process |
| CN107101946B (en) * | 2017-06-28 | 2019-11-15 | 哈尔滨工业大学 | The homologous laser pump (ing) detection device of light delay with probe optical pulse compress technique |
| JP6955932B2 (en) * | 2017-08-25 | 2021-10-27 | 株式会社ディスコ | Laser beam profiler unit and laser processing equipment |
| CN108387319B (en) * | 2018-01-03 | 2020-01-07 | 上海交通大学 | Single-emitting broadband terahertz frequency spectrograph |
| CN110186579B (en) * | 2019-05-17 | 2020-01-21 | 华南理工大学 | Method and system for acquiring space-time information of ultrafast light field |
| CN110487426B (en) * | 2019-09-11 | 2021-10-01 | 深圳固星激光技术有限公司 | Near-infrared femtosecond laser spectrum phase measuring device |
| CN111277328B (en) * | 2020-02-20 | 2021-02-12 | 电子科技大学 | System and method for measuring group velocity dispersion in optical waveguide |
| CN112697273A (en) * | 2020-12-08 | 2021-04-23 | 中国人民解放军空军工程大学 | Remote laser light field energy uniformity measuring system |
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| CN100575897C (en) * | 2008-08-13 | 2009-12-30 | 中国科学院上海光学精密机械研究所 | Picosecond pulse contrast single measuring instrument |
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