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In this paper we examine how optical techniques can be used for impurities (or defects) detection and identification in KH2PO4 (KDP) components. This is important in so far as some of these defects are responsible for a much weaker than expected Laser-Induced Damage Threshold (LIDT) in these materials, i.e. for a weaker resistance to a laser shot. KDP materials are investigated by photothermal deflection,...
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