14 November 2013 General model for nanosecond-laser induced damage in KTiOPO4 crystals
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A model explaining a number of experimental observations on nanosecond laser induced damage in KTP is presented. According to this model the nanosecond laser damage mechanism in KTP is composed of two successive steps. The generation of transient laser damage precursors by multi-photo absorption and the subsequent heating of conduction band electrons provided by the damage precursors. The strong synergy of 1064 nm and 532 nm wavelengths during simultaneous irradiation is quantitatively explained as well as the polarization-dependent anisotropy of the damage threshold. We further give some details on a multi-pulse irradiation experiment carried out with verified smooth temporal pulses that confirmed the existence of statistical pseudo-fatigue at 1064 nm.
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Frank Wagner, Frank Wagner, Guillaume Duchateau, Guillaume Duchateau, Jean-Yves Natoli, Jean-Yves Natoli, Mireille Commandre, Mireille Commandre, "General model for nanosecond-laser induced damage in KTiOPO4 crystals", Proc. SPIE 8885, Laser-Induced Damage in Optical Materials: 2013, 888517 (14 November 2013); doi: 10.1117/12.2030194; https://doi.org/10.1117/12.2030194

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