| Abstract [eng] |
Advances in laser technology research allow for the development of laser systems with ever higher power, higher repetition rates and shorter pulses. Such systems are applied in scientific research, high-tech industry, medicine and other fields. Multi-layer interference coatings used in high-intensity laser systems must have low absorption and meet increasingly strict spectral and laser radiation resistance requirements. The aim of the dissertation is to expand the application possibilities of Bragg and broadband chirped mirrors in high-power ultrashort pulse laser systems by optimizing the coating structure and thus improving their resistance to intense laser radiation, spectral parameters and determining critical parameters for linear absorption control. The first part of the thesis describes the research that determines the extinction coefficients of dielectric multilayer coating materials for 1064 nm wavelength radiation. The absorption of multilayer coatings is also measured and compared with the modeled values based on the determined extinction coefficients. In the second part of the dissertation, a prototype of a broadband chirped mirror with a nanostructured porous layer is demonstrated. Also the parameters of the mirror, their stability over time and due to relative humidity change are investigated. In the third part of the dissertation, the dependence of the laser-induced damage threshold on the coating structure is investigated. The research described in the thesis allows to understand the dependence of the studied parameters on the structure of the coating and the materials used and provides the necessary knowledge for the prediction and optimization of the parameters. |
