Metal dielectric film wideband pulse compressed grating

Abstract

A metal dielectric film wideband pulse compressed grating used in 800nm center wavelength consists of a metal layer, a matching layer consisting of dielectric films and a grating etching layer which are sequentially arranged on a quartz substrate from the inside out and integrated together, and the outermost layer is SiO2. The rectangular grating has the period of 490-640nm, and the duty cycle of 0.2-0.4. The interlayer of the grating etching layer is a high-refractivity layer, the inner layer and the outer layer of the grating etching layer are low-refractivity layers SiO2; the outer layer of the matching layer is a high-refractivity layer, and the inner layer of the matching layer is a low-refractivity layer; and the thickness of the gold layer is larger than 50nm. By adopting the metal dielectric film wideband pulse compressed grating at the 700-909 nm band, the -1-level reflection and diffraction efficiencies of TE polarization are larger than 90 percent at the incidence angle of 53 DEG; and when the grating is at the 800nm incident wavelength, the -1-level reflection and diffraction efficiencies of TE polarization are larger than 90 percent at the incidence angle of 29-65 DEG. The metal dielectric film wideband pulse compressed grating can be used as a pulse compressed grating of a high-power ultrashort impulse laser system.

Description

technical field [0001] The invention relates to a high-power laser system, in particular to a metal dielectric film broadband pulse compression grating for 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 laser processing and research on the interaction between light and matter. Reflective gratings for stretching and compressing femtosecond laser pulses play an important role in chirped pulse amplification systems. The pulse compression grating must have high diffraction efficiency, anti-laser damage threshold and wide enough working bandwidth. The earliest pulse compression grating is a gold-plated grating, which has a relatively wide operating bandwidth, but it is difficult to obtain high diffraction efficiency and anti-laser damage threshold due to its strong absorption characteristics. Multilayer dielectr...

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Problems solved by technology

As far as we know, no one has proposed a wide-spectrum, wide-angle spectrum metal dielectric film reflective polarization beam splitter grating for the 1053 nm band

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