Third order correlation measuring instrument

Abstract

A kind of third-order correlation survey meter used for measuring third harmonic of strong laser burst , which includes: on instrument's soleplate, along incident beam G heading direction, in turns fix first pinhole diaphragm, second pinhole diaphragm, octonal crystal and beam splitting piece. Incident beam G divide into two bundle ray after passing this beam splitting piece: transmitted light bundle G [ T] and reflected beam G [ F]; transmitted light bundle G [ T] pass by time tardy first rectangular reflect mirror, second reflector, half-wave plate, third reflector, then arrive short coke lens; reflected beam G [ F] passing by fourth reflector, second corner rectangular reflect mirror, then arrive the short coke lens, and with transmitted light bundle G [ T] at the same time met on harmonic crystal; along progressive direction of third harmonics beam G [ S] generated by this overtone crystal, at soleplate in turns fix filter plate, scaling attenuation piece and detector.

Description

Technical field [0001] The invention relates to pulse measurement, in particular to a third-order correlation measuring instrument for measuring the contrast of laser pulses. It uses the adjustability of the crystal position to change the relative position of the crystal and the focal point, thereby adjusting the frequency efficiency in the crystal. It has the advantages of simple operation, easy adjustment and wide application range. Background technique [0002] In recent years, the femtosecond chirped pulse amplification system has amplified the energy of the laser pulse to the order of Joule, and the focus intensity can reach 10 21 W / cm 2 Such high laser intensity can be widely used in the research of plasma formation process and high-order harmonic emission in solid and gas targets. In experimental studies, the effects of these physical processes are very sensitive to the time intensity distribution of laser pulses. Especially in the plasma generation process, the presence o...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a third-order correlation measuring instrument for accurately measuring the third harmonic contrast of strong laser pulses for the difficulties in optical path adjustment of the above-mentioned prior art and the shortcomings that the measurement range is limited by the energy of a single pulse. Simplify the adjustment process of the device, ensure the measurement range, effectively avoid crystal damage, and facilitate the application and promotion of the third-order correlation measuring instrument

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