This work presents the influence of polarization orientation on bulk damage performance of type I doubler KDP crystals under different wavelengths pulses exposure. Pinpoints densities (PPD) and the size distribution of pinpoints are extracted through light scattering pictures. The obtained results strongly indicate that the measured PPD as a function of the fluence are both wavelength and polarization orientation related, while neither fluence nor polarization orientation affect the size distribution of pinpoints. We also find that the bulk damage characteristics can divide into three sorts with respect to the wavelength, suggesting the existence of different species of precursors and different mechanisms responsible for bulk damage initiation in SHG KDP crystals.
The investigation of the influence polarization orientation on damage performance of type I doubler KDP crystals grown by the conventional growth method under under 532nm pulse exposure is carried out in this work. The obtained results point out the pinpoint density (ppd) of polarization parallels the extraordinary axis is around 1.5× less than that of polarization parallels the ordinary axis under the same fluence, although polarization has no influence on size distribution of pinpoints. Meanwhile, crystal inhomogeneity is observed during experiment.
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