Fig. 1. Schematic diagram of the experimental bench used for the characterization of the bulk damage of KDP crystals.

Fig. 2. Scatter image of the bulk damage sites resulting from a single-shot 532 nm, 6.5 ns laser pulse with fluence of around 7.76  J/cm2.

Fig. 3. Ppd versus fluence for doubler KDP crystals under 532 nm pulse irradiation with different polarizations.

Fig. 4. Relationship between laser-induced damage threshold and the radius of the precursor calculated from the nano absorber model^[8,19].

Fig. 5. Size distribution of pinpoints induced by a 532 nm, 6.5 ns pulse with different fluences and polarization orientations.