Metal medium film broadband pulse width compression grating with central wavelength of 800 nm

Abstract

The invention discloses a metal medium film broadband pulse width compression grating with the central wavelength of 800 nm, and the grating is characterized in that the grating is formed by the integrating of a metal layer, a residual layer and a grating layer on a quartz substrate from the bottom layer to an outer layer; the grating layer is a trapezoidal grating, and the material of the trapezoidal grating is SiO2; the period is 500-680 nm; the bottom duty ratio is 0.48-0.58; the bottom angle is 83-86 degrees; and a groove depth is 860-930 nm. According to the invention the -1-order reflection diffraction efficiency of TE polarization is greater than 90% at an incident angle of 65 degrees and at the band of 750-850 nm. The incident laser with the wavelength of 800 nm is incident to thesurface of the grating at the angle of 65 degrees or 17 degrees, and the -1-order reflection diffraction efficiency of the grating for the TE polarized light is greater than 90%. According to the invention, a monopulse surface damage threshold is 0.4J / cm2@35fs, 800+ / -35 nm. The grating can be used as a pulse width compression grating of a high-power ultrashort pulse laser system.

Description

technical field [0001] The invention relates to a high-power laser chirped pulse amplification system, in particular to a metal dielectric film broadband pulse width compression grating with a central wavelength of 800 nanometers. Background technique [0002] High-power ultrashort pulse lasers based on chirped pulse amplification technology have a wide range of application requirements in the fields of plasma physics, light-matter interaction, and ultrafast observation. Reflective gratings for stretching and compressing femtosecond laser pulses play an important role in chirped pulse amplification systems. The pulse width compression grating must have high diffraction efficiency, anti-laser damage threshold and wide enough working bandwidth. The earliest pulse width compression grating is a gold-plated grating, which has a relatively wide operating bandwidth, but due to its strong absorption characteristics, it is difficult to obtain high diffraction efficiency and anti-la...

AI Technical Summary

Problems solved by technology

As far as we know, no one has proposed a high-threshold metal dielectric film broadband pulse width compression grating for the 800 nm band

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