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Excimer laser conditioning of KDP: correlation of nondestructive optical diagnostics at 351nm with laser damage threshold

We investigated the crystals with different non-destructive optical diagnostics during the conditioning of KDP with an excimer laser at 351 nm. We measured in the same time the luminescence, the absorption and bulk scattering of the material. These observations pointed out the defects within the crystal. We demonstrated a correlation of the optical signal intensity with the laser damage threshold of KDP.