Broadband dispersion mirror structure with high laser damage threshold

Abstract

The invention provides a broadband dispersion mirror structure with a high laser damage threshold. The broadband dispersion mirror structure sequentially comprises a substrate, a chirp layer and an electric field modulation layer from bottom to top; the substrate is a substrate material of the dispersion mirror; the chirp layer is a multi-layer dielectric film layer of which the film layer thickness is gradually changed in a chirp manner; the electric field modulation layer is a multi-layer dielectric film layer with the film layer thickness changing periodically and arranged repeatedly. The bottom of the broadband dispersion mirror structure with the high laser damage threshold is a traditional chirp structure, and the electric field modulation layer structure is creatively introduced into the top of the broadband dispersion mirror structure with the high laser damage threshold; according to the novel dispersion mirror structure, the electric field modulation layer is a multi-layer dielectric film layer of which the film layer thickness changes periodically and is arranged repeatedly, so that standing wave field peak values of wavelength components in the electric field modulation layer are mutually staggered, and the maximum peak electric field intensity is greatly reduced. The total peak electric field intensity is reduced by modulating the standing wave field distribution of all wavelengths in the dispersion mirror at the same time, and finally the laser damage threshold can be effectively improved.

Description

technical field [0001] The invention belongs to the field of ultrafast laser thin films, in particular to a broadband high laser damage threshold dispersion mirror structure. Background technique [0002] In the development of ultrafast laser technology, the advantages and disadvantages of dispersion compensation methods directly affect the generation and stable operation of ultrafast laser pulses, and the invention and use of dispersion mirrors are milestones for ultrafast lasers. The dispersive mirror has the advantages of precise control of dispersion compensation, convenient adjustment, and compact structure. By giving different delays to light of different wavelengths, the dispersive mirror can provide accurate dispersion compensation for group delay, and will not introduce high-order dispersion and nonlinear effects, ensuring The output quality of the laser pulse is improved. With the further development of ultra-intensive and ultra-short laser technology, the laser p...

AI Technical Summary

Problems solved by technology

However, there are few studies on the femtosecond damage threshold of laser thin films, especially the research on the damage mechanism and damage process of broadband dispersion-tuned thin films with complex film structures is not enough, and how to obtain high-threshold broadband dispersion-tuned thin films has been researched. It is in a state to be further explored, so it is of great importance and significance to carry out relevant work

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