19 October 2005 Nondestructive optical characterization of KH2PO4 crystals heterogeneities and adapted excimer laser conditioning process
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The high-power Laser MegaJoule (LMJ) for inertial confinement fusion experiments that is currently under construction at CEA-CESTA in France will require a high number of large aperture Pockels cells and frequency converters made of potassium dihydrogen phosphate (KDP) and DKDP (Deuterated KDP). These optical components will be operated several times a year at fluences close to their Laser Induced Damage Threshold (LIDT) which may reduce significantly their lifetime and increase substantially the maintenance costs of the LMJ. In a global effort to reduce these costs we have designed the SOCRATE facility as a complete system for materials characterization, LIDT measurement and optics conditioning by laser to increase their lifetime. In this paper we examine the relevance of adapting the laser conditioning process to the bulk KDP quality. First the existence of heterogeneities in large KDP crystals is stressed; next the LIDTs in the different parts of the crystals using focused or collimated beams are compared. Finally we focus on the efficiency of the excimer conditioning process in the different growth sectors of KDP samples and demonstrate that for the current conditioning process the efficiency depends only weakly on the original material heterogeneities.
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Matthieu Pommiès, Matthieu Pommiès, David Damiani, David Damiani, Bertrand Bertussi, Bertrand Bertussi, Jérémie Capoulade, Jérémie Capoulade, Jean-Yves Natoli, Jean-Yves Natoli, Hervé Piombini, Hervé Piombini, Hervé Mathis, Hervé Mathis, } "Nondestructive optical characterization of KH2PO4 crystals heterogeneities and adapted excimer laser conditioning process", Proc. SPIE 5965, Optical Fabrication, Testing, and Metrology II, 59651K (19 October 2005); doi: 10.1117/12.625084; https://doi.org/10.1117/12.625084

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