Method for improving signal-to-noise ratio of femtosecond laser by using chirp matched optical parametric chirped pulse amplification

Abstract

The invention discloses a method for improving a signal-to-noise ratio of femtosecond laser by using chirp matched optical parametric chirped pulse amplification and a device thereof, which belong to the technical field of ultra-short pulses. The method comprises the following steps of: firstly, stretching the femtosecond laser with a signal-to-noise ratio to be improved output by a femtosecond laser light source into chirp signal light; secondly, performing high magnification on a signal and performing low magnification on a noise by using the chirp matched optical parametric chirped pulse amplification so as to improve the signal-to-noise ratio of the chirp signal light; and finally, compressing the chirp signal light into femtosecond laser with a high signal-to-noise ratio by using an optical pulse compressor. The device for implementing the method comprises a femtosecond laser light source, a femtosecond laser, a first non-linear optical crystal, a second non-linear optical crystal, a first light pulse stretcher, a second light pulse stretcher, an optical pulse amplifier, an optical pulse compressor, a first dichroic mirror and a second dichroic mirror. The method and the device of the invention can not only improve the signal-to-noise ratio of the femtosecond laser effectively, but also realize high-efficient amplification of the femtosecond laser.

Description

Chirp-matched optical parametric chirped pulse amplification method to improve signal-to-noise ratio of femtosecond laser technical field The invention belongs to the field of ultrashort pulse technology, and in particular relates to a method for improving the femtosecond laser signal-to-noise ratio by chirp matching optical parametric chirped pulse amplification (OPCPA) technology, and a device for realizing the method. Background technique Since the birth of laser, high-power ultrashort pulse laser technology has developed rapidly. Currently, chirped pulse amplification (CPA) technology has been used to obtain femtosecond laser pulses with peak powers up to petawatts. After the femtosecond laser pulse is focused, its optical field intensity can reach 1022W / cm2, and the resulting optical field intensity is hundreds or even millions of times higher than the electric field intensity in atoms. The laser electric field provides extreme physical conditions, thus It provides a...

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However, it is powerless to amplify the noise in the time window

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