Adjustment Method of Grating Pair of Cylindrical Expander

Abstract

The invention relates to femtosecond pulse stretching, which is an adjustment method for a grating pair of a cylindrical stretcher. The adjustment system includes a cylindrical convex mirror, a cylindrical concave mirror, a broadband light source, a small hole diaphragm, a white film, an optical fiber spectrometer and its installation. The adjustment platform, the first grating and the second grating to be adjusted. The adjustment of the first grating and the second grating adopts a similar method. Adjust the grating to be perpendicular to the output light of the broadband light source, fix the position of the fiber optic spectrometer probe, rotate the grating so that the peak wavelength of the diffracted light is the same as the theoretical calculation value, and use the diffracted light to adjust the grating to be parallel. The invention has the advantages of simple operation, high precision, wide application range, and is not limited by the horizontal and vertical stagger distances of the gratings, and the working surfaces of the grating pairs can face the same direction.

Description

technical field [0001] The invention relates to femtosecond pulse stretching, and relates to a method for adjusting grating pairs of a cylinder stretcher. The invention utilizes diffracted light to adjust the grating pair to be parallel, and has the advantages of simple operation, high precision, wide adjustment range, and is not limited by the horizontal and vertical stagger distance of the grating. Background technique [0002] Chirped pulse amplification technology is currently a classic method for obtaining ultrashort and ultra-intense laser pulses. It first uses a stretcher to introduce a certain amount of chirp to the femtosecond seed pulse to widen the pulse, and after necessary amplification, uses a compressor to Introducing the opposite amount of chirp to the stretcher restores the pulse width. Since the peak power of the stretched pulse has been greatly reduced, the chirped laser pulse can be fully amplified in the subsequent amplification process without prematur...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, Li Chuang et al., Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, used a collimated light source and a right-angle prism to adjust the parallelism of the grating pair by using the right-angle prism. There is a limit to the horizontal offset distance, but the disadvantage is that this method is not applicable when the two gratings do not intersect in the vertical direction or the working surfaces of the gratings are in the same direction

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