Miniaturization pulse stretcher design method for compensating high material dispersion of regenerative amplifier

Abstract

This invention discloses a design method for small femtosecond laser impulse stretcher used in regenerative amplifier high-dispersion material compensation, which belongs to the femtosecond impulse amplify technique. This method adopts concave spherical lens, convex spherical lens, grating and plane lens to design structure according to the phase Phi and grating position S1 of the stretcher. This method is characterized by the following: If the curvature radius of spherical lens is R, the distance between the grating and the concave spherical lens varies between zero to R; the convex spherical lens overlapped with the grating; if the stretching spectrum of the incidence light is larger than the lens width of the concave spherical lens, then it needs to reduce with equal proportion the curvature radium of the concave spherical lens and convex spherical lens and reduces the spectrum stretching width and keeps the original stretching degree.

Description

technical field [0001] The invention relates to a design method for a miniaturized femtosecond laser pulse stretcher suitable for high material dispersion compensation of a regenerative amplifier. It belongs to femtosecond pulse amplification technology. Background technique [0002] In order to amplify the femtosecond laser pulse, it is necessary to first broaden the seed pulse from the oscillator to the nanosecond level, then amplify it, and finally compress it to the width of the incident pulse, while having an energy increment of more than a million times. The principle behind compressing the pulse back to the same magnitude as the incident pulse is that if the dispersion of the additional material in the amplifier cannot be fully compensated by other means, then it is necessary to design pulse stretchers and compressors that match its material dispersion. Usually, the structure of the grating-to-compressor has no other method to arbitraril...

AI Technical Summary

Problems solved by technology

However, neither the usual stretchers of the Matinez type [2] nor the Offner type [3] can handle large material dispersions (such as those in regenerative amplifiers)

Generally speaking, because the Martinez-type stretcher has a larger aberration than the Offner-type stretcher, this aberration can be converted into additional dispersion. Therefore, under the same condition of the compressor structure, the Martinez Type stretchers accommodate more material dispersion and are more suitable for regenerative amplifiers, while Offner type stretchers are generally considered unsuitable for use in regenerative amplifiers

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