An adjusting method for a cylindrical surface stretcher grating pair

Abstract

The present invention relates femtosecond pulse stretching, and disclose an adjusting method for a cylindrical surface stretcher grating pair. The adjusting system comprises a cylindrical surface convex mirror, a cylindrical surface concave mirror, a broadband light source, an aperture diaphragm, a demo lens, a fiber optical spectrometer and an adjusting platform for installation of the fiber optical spectrometer, a first raster and a second raster. The first raster and the second raster are to be adjusted. Adjusting of the first raster and the second raster employs similar methods. An adjusting raster is perpendicular to output light of the broadband light source. The position of a probe of the fiber optical spectrometer is fixed, and then the rasters are rotated to make the peak wavelength of diffracted light to be the same with a theoretical calculating value. The diffracted light is utilized to enable the raster pair to be parallel. The adjusting method of the invention has advantages that the operation is simple; the precision is high; the application scope is broad; restrictions by raster levels and vertical staggering distances will not exist; working surfaces of the raster pair can be oriented towards 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

Images