Potassium Dihydrogen Phosphate (KDP) is a non-linear optical material for the Pockelscells and laser frequency
conversion used in inertial confinement fusion (ICF).But the performances are decreased by the presence of defects or
impurities from the growth process. Furthermore, it is difficult to identify them due to their small size and sparse
distribution. Laser conditioning provides an increase for the material damage resistance due to an unknown physical
mechanism resulting from the interaction of sub-damage laser pulses with KDP defects.
In this paper, the crystals first were laser conditioned by raster scanning using Nd:YAG laser at 355nm with pulse
durations of approximately 7 ns. Then we investigated the KDP crystals with different non-destructive optical
diagnostics. We measured in the same time the fluorescence, the photothermal absorption, Raman and FTIR
spectroscopy of the material. We concentrated on the differences of conventionally grown KDP crystals before and after
the laser conditioning. We obtained the different spectra information of KDP crystals.
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