Intrinsic and multiple pulse laser-induced damage of transparent dielectrics in the femto-nanosecond region

Oleg M. Efimov

doi:10.1117/12.580022

15 July 2004 Intrinsic and multiple pulse laser-induced damage of transparent dielectrics in the femto-nanosecond region

Oleg M. Efimov

Author Affiliations +

Proceedings Volume 5506, Nonresonant Laser-Matter Interaction (NLMI-11); (2004) https://doi.org/10.1117/12.580022
Event: Nonresonant Laser-Matter Interaction (NLMI-11), 2003, St. Petersburg, Russian Federation

Abstract

This review is devoted to a long-term investigation into the nature of the laser-induced damage of silicate glasses. Besides damage threshold measurements, it includes data about linear and nonlinear absorption, multiple pulse damage, and subthreshold modification of media. The experiments were carried out over a wide range of wavelengths, pulse durations, and spot sizes. As an important result, we show that the threshold power density of the intrinsic damage of the boro-silicate glass at ~1 µm wavelength does not depend on pulse duration from 2x10^-13 to 3x10^-8s as long as self-focusing is avoided. This result cannot be explained by existing theories and indicates that the damage mechanism involves a collective response of a certain volume in the dielectric as a whole, rather than the accumulation of electrons via individual generation processes, like multiphoton, tunneling, or avalanche. Special attention in the research was paid to investigation into the processes of electron excitation in alkali- and lead-silicate glasses.

Citation Download Citation

Oleg M. Efimov "Intrinsic and multiple pulse laser-induced damage of transparent dielectrics in the femto-nanosecond region", Proc. SPIE 5506, Nonresonant Laser-Matter Interaction (NLMI-11), (15 July 2004); https://doi.org/10.1117/12.580022

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