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Proceedings Paper

A theoretical analysis for temperature dependences of laser-induced damage threshold
Author(s): K. Mikami; S. Motokoshi; T. Somekawa; T. Jitsuno; M. Fujita; K. A. Tanaka
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Paper Abstract

The temperature dependence of the laser-induced damage threshold on optical coatings was studied in detail for laser pulses from 123 K to 473 K at different temperature using Nd:YAG laser (wavelength 1064 nm and pulse width 4 ns) and Ti:Sapphire laser (wavelength 800 nm and pulse width 100 fs, 2 ps, and 200 ps). The six kinds of optical monolayer coatings were prepared by electron beam evaporation and the coating materials were SiO2, Al2O3, HfO2, ZrO2, Ta2O5, and MgF2. For pulses longer than a few picoseconds, the laser-induced damage threshold of single-layer coatings increased with decreasing temperature. This temperature dependence was reversed for pulses shorter than a few picoseconds. We describe the physics models to explain the observed scaling. The electron avalanche is essential to explain the differences in the temperature dependence. In other words, the balance between linear process such as electron avalanche etc. and nonlinear process such as multiphoton ionization etc. will be able to decide the tendency of the temperature dependence. The proposed model also gives one of possibility for an extremely high LIDT optics.

Paper Details

Date Published: 14 November 2013
PDF: 9 pages
Proc. SPIE 8885, Laser-Induced Damage in Optical Materials: 2013, 88851T (14 November 2013); doi: 10.1117/12.2030180
Show Author Affiliations
K. Mikami, Osaka Univ. (Japan)
S. Motokoshi, Institute for Laser Technology (Japan)
T. Somekawa, Institute for Laser Technology (Japan)
T. Jitsuno, Osaka Univ. (Japan)
M. Fujita, Institute for Laser Technology (Japan)
K. A. Tanaka, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 8885:
Laser-Induced Damage in Optical Materials: 2013
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau, Editor(s)

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