Impurities detection by optical techniques in KH2PO4 crystals

Matthieu Pommiès; David Damiani; Xavier Le Borgne; Audrey Surmin; Jean-Claude Birolleau; Fabien Pilon; Christophe Dujardin; Bertrand Bertussi; Hervé Piombini

doi:10.1117/12.695323

15 January 2007 Impurities detection by optical techniques in KH₂PO₄ crystals

Matthieu Pommiès, David Damiani, Xavier Le Borgne, Audrey Surmin, Jean-Claude Birolleau, Fabien Pilon, Christophe Dujardin, Bertrand Bertussi, Hervé Piombini

Author Affiliations +

Proceedings Volume 6403, Laser-Induced Damage in Optical Materials: 2006; 64031P (2007) https://doi.org/10.1117/12.695323
Event: Boulder Damage Symposium XXXVIII: Annual Symposium on Optical Materials for High Power Lasers, 2006, Boulder, Colorado, United States

Abstract

In this paper we examine how optical techniques can be used for impurities and defects detection in KH₂PO₄ (KDP) components. This is important in so far as some of these defects are responsible for a weaker than expected laser-induced threshold in these materials. Photothermal deflection, polariscopy, fluorescence and photoexcitation are investigated with the aim of localizing and identifying the laser-induced damage precursors. Impurities concentration is measured directly by ICP-AES and Fe is accordingly checked to be at the origin of a higher absorption in the prismatic sectors of rapidly grown KDP crystals. We also exhibit a fluorescence signal in the near-ultraviolet range by pumping at 248 nm; in rapidly grown crystals, in the same way as iron, the incorporation rate of the fluorescent centers is shown to depend on the growth sector.

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Matthieu Pommiès, David Damiani, Xavier Le Borgne, Audrey Surmin, Jean-Claude Birolleau, Fabien Pilon, Christophe Dujardin, Bertrand Bertussi, and Hervé Piombini "Impurities detection by optical techniques in KH₂PO₄ crystals", Proc. SPIE 6403, Laser-Induced Damage in Optical Materials: 2006, 64031P (15 January 2007); https://doi.org/10.1117/12.695323

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