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Single-shot laser pulse detection device

A detection device, laser pulse technology, applied in the direction of instruments, etc., can solve the problem that the measurement method does not have a ready-made standard, etc., and achieve the effect of improving the dynamic range

Active Publication Date: 2022-07-12
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are relatively few reports on the large dynamic range signal-to-noise ratio measurement method for single-shot measurement at home and abroad, and there is no ready-made standard for the measurement method

Method used

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  • Single-shot laser pulse detection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] like figure 2 As shown, 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 measured, and then the computer 100 controls the opening time of the electric shutter 1. When the laser pulse to be measured passes through the electric shutter At 1 (Shutter), the single-shot laser pulse detection device and the pulse generation device run synchronously to reduce the stray light in the instrument and improve the signal-to-noise ratio of the instrument itself. Then, the polarization of the laser pulse to be measured is deflected by 45 degrees through the half-wave plate 2 to adjust the splitting ratio; Filter), the soft edge diaphragm ceramic aperture 71 is arranged at its focal point, is to make the laser pulse to be measured become a super-Gaussian flat-top beam, and at the same time expand the beam aperture M1 times; Two paths: the reference light path for p-polarization in the upper arm an...

Embodiment 2

[0087] like image 3 As shown, 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 measured, and then the computer 100 controls the opening time of the electric shutter 1. When the laser pulse to be measured passes through the electric shutter At 1:00, the single-shot laser pulse detection device and the pulse generation device run synchronously, reducing the stray light in the instrument and improving the signal-to-noise ratio of the instrument itself. Then, the laser pulse to be measured is polarized and deflected by the half-wave plate 2 to meet the phase matching needs of the nonlinear crystal (ooe) to adjust the splitting ratio; The input pulse is divided into two paths by the proportional beam splitter 321: the upper arm p-polarized frequency-doubling reference light path and the lower arm s-polarized fundamental frequency detection light path.

[0088] The reference optical path of the...

Embodiment 3

[0092] like Figure 4 As shown, 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 measured, and then the computer 100 controls the opening time of the electric shutter 1. When the laser pulse to be measured passes through the electric shutter At 1:00, the single-shot laser pulse detection device and the pulse generation device run synchronously, reducing the stray light in the instrument and improving the signal-to-noise ratio of the instrument itself. Then, the laser pulse to be measured is polarized and deflected by the half-wave plate 2 to meet the phase matching needs of the nonlinear crystal (ooe) to adjust the splitting ratio; The input pulse is divided into two paths by the proportional beam splitter 321: the upper arm p-polarized frequency-doubling reference light path and the lower arm s-polarized fundamental frequency detection light path.

[0093] Wherein, the reference optical p...

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Abstract

The invention provides a single-shot laser pulse detection device, comprising: a detection optical circuit, which transmits fundamental frequency detection optical pulses; a reference optical circuit, which transmits frequency-doubling reference optical pulses; Double pulses transmitted in collinear reference optical paths; optical pulse converters for converting double pulses into sub-pulses in the form of a series of double pulses that are delayed in time, spaced apart from each other, and propagate substantially in parallel; pulses The stretcher is used to translate each frequency component of the fundamental frequency probe light pulse, so as to expand in the time domain; the disperser is used to spatially separate each frequency component in the fundamental frequency probe light pulse; and the plane detection The device is used to generate a third-order cross-correlation pulse signal from the fundamental frequency probe light pulse and sub-pulse from the disperser. The invention can accurately measure the femtosecond petawatt laser pulse waveform, and solves the problem of difficulty in diagnosing ultra-fast ultra-intense pulses with a large dynamic range.

Description

technical field [0001] The invention relates to the technical field of engineering optics application, in particular to a single-shot laser pulse detection device. Background technique [0002] In the 1980s, scientists at the University of Rochester proposed chirped pulse amplification (CPA), which made ultra-high-power ultra-fast laser pulses possible (see D. Strickland and G. Mourou, Opt. Commun. 56, 219 ( 1985). Based on this principle and technology, several laboratories in the world have obtained peak power breakthrough PW (petawatt, 10 15 W) single-shot super-intense laser output. How to measure the contrast of this type of laser is a major concern and affects the development of this laser research. [0003] Generally, in the background signal of the amplified laser pulse, there are some noise pulses with relatively high intensity, and their existence will have an adverse effect on the results of physical experiments. Excessive pre-pulses will generate pre-plasma on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00
Inventor 李铭魏志义王兆华沈忠伟范海涛
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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