Pulse compression electrum grating and its preparation method

Abstract

A pulse-compressed electrum grating comprises a metal layer that is composed of a binary or multi-element mixture of gold-based materials containing silver and platinum group elements in appropriate proportions, or a gold-on-silver thin film structure. A preparation process comprises optimization of the characteristic contour parameters of the electrum grating and the material ratio thereof. The electrum grating, without degrading traditional optical performance of gold gratings, broadens high-diffraction-efficiency wavelength range of the grating, addresses or improves the oxidation susceptibility of pure silver gratings, and further enhances the laser damage threshold of gold gratings. The process parameters support fabrication of gratings with an aperture size up to the meter level. The gratings and related process parameters support development of devices ranging from spectrometers and commercial ultrafast lasers to large-scale high-peak-power lasers, which have significant implications for the advancement of pulse compression gratings.

Dependencies are inferred from the claim text.