Simple models for laser-induced damage and conditioning of potassium dihydrogen phosphate crystals by nanosecond pulses.

摘要: When potassium dihydrogen phosphate crystals (KH2PO4 or KDP) are illuminated by multi-gigawatt nanosecond pulses, damages may appear in the crystal bulk. One can increase damage resistance through a conditioning that consists carrying out laser pre-exposure of crystal. The present paper addresses modeling laser-induced and KDP crystals. method is based on heating distribution defects, cooperation which lead to dramatic temperature rise. In previous investigation [Opt. Express 15, 4557-4576 (2007)], calculations were performed for cases where heat diffusion was permitted one three spatial dimensions, corresponding respectively planar point defects. For sake completeness, study involves 2D associated with linear A comparison experimental data leads conclusion 1D most appropriate describing KDP. Within this framework, evolution density given as function energy an in-depth analysis results provided simple analytical expressions be used design. Regarding conditioning, assuming it due decrease defect absorption efficiency, two scenarios various natures proposed these account certain observed facts. instance, order improve damage, needs use pulse duration shorter than testing pulse. Also, scenario migration (atomic-size) defects allows reproduction logarithmic-like gain respect number pre-exposures. Moreover, aims at refining knowledge regarding precursor responsible presented modeling, best candidate permitting major facts comprised collection one-hundred-nanometer structural instance cracks couples oxygen interstitials vacancies.