12 April 1996 Laser-induced damage of glasses by pulsed radiation in nano-picosecond region
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The dependence of laser-induced damage threshold of K8 (Russia) and BK7 (USA) glasses on laser pulse duration in the wide region from 4 (DOT) 10-11 to 3 (DOT) 10-8 s has measured. Strong attention is paid to methods of measurements. It is indicated to strong influence of laser radiation statistics on the results of the threshold measurements. It is shown that intrinsic laser-induced damage threshold of glasses does not depend on pulse duration when there is not self-focusing. However the time dependence appears when spot size has become more than the wavelength of laser radiation. It is determined by Kerr nonlinearity in the region of pulse durations less than 10-9 s. For longer pulses the other types of nonlinearity are important as well. It is established that the critical power of the self-focusing is not constant for the same glass, and one depends on the concrete focusing conditions. Besides it is shown that the vector character of electric field strength of laser radiation must take into account under calculation of this value in the focal region under tight focusing conditions.
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Oleg M. Efimov, Oleg M. Efimov, Leonid B. Glebov, Leonid B. Glebov, Vladimir S. Popikov, Vladimir S. Popikov, M. J. Soileau, M. J. Soileau, } "Laser-induced damage of glasses by pulsed radiation in nano-picosecond region", Proc. SPIE 2770, Laser Optics '95 and ICONO '95: Superintense Laser Fields, (12 April 1996); doi: 10.1117/12.238033; https://doi.org/10.1117/12.238033

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