Picosecond pulse contrast single measurement instrument

Abstract

The invention relates to a single measuring device of picosecond pulse contrast, which consists of a spectroscope, a first reflector, a second reflector, a third reflector, a fourth reflector, a fundamental frequency Dammam grating, a fundamental frequency compensating grating group, a fifth reflector, a sixth reflector, a double-frequency crystal, a double-frequency Dammam grating, a double-frequency compensating grating group, a reflector group, a beam combining mirror group, a triple-frequency crystal group, a filter plate group and a photomultiplier group. The measuring device adopts the Dammam grating to realize the multi-channel splitting of pulses and double-frequency signals thereof, which are to be detected, so as to measure the contrast of more than 10<8>. Moreover, the measuring device can make use of different angles generated when the Dammam grating is splitting light, so as to achieve the gradual delay of the optical path. The distance between the Dammam gratings and the distance between the Dammam grating and the compensating grating can be changed to adjust the maximum value of the delay of the optical path and to realize the measurement of time delay of 100ps.

Description

technical field [0001] The invention relates to laser parameter diagnosis, in particular to a single measurement device for picosecond pulse contrast. Background technique [0002] High-power laser pulses are widely used in strong-field physics research such as laser-plasma interaction, X-ray laser, multi-photon ionization, and high-order harmonic generation. When using ultra-short and ultra-intense laser pulses to target, if the noise signal before the main pulse exceeds a certain intensity, it will destroy the target surface and generate plasma, which will cause complex adverse effects. Therefore, it is necessary to monitor the noise signal intensity preceding the laser pulse. [0003] In order to obtain ultra-short and ultra-intense petawatt laser, the optical parametric chirped pulse amplification (OPCPA) technology is adopted. This technology is to broaden a beam of low-energy femtosecond broadband seed signal optical pulses to be amplified in the time domain through ...

AI Technical Summary

Problems solved by technology

[0006] The problem with this technique is that high dynamic range contrast measurements cannot be achieved and the time delay is limited

Therefore, its measurable dynamic range can only reach 10 4 Magnitude

On the other hand, the measurable time delay is limited by the beam width of the fundamental frequency signal and the double frequency signal and the size of the double prism, and can only be measured within ±10ps

Therefore, the dynamic range and time delay of the existing single-shot measurement system cannot meet the application requirements

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