13 May 1997 Investigation of impurities and laser-induced damage in the growth sectors of rapidly grown KDP crystals
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Abstract
We report the experimental results of impurity contamination and laser-induced damage investigations on rapidly grown potassium dihydrogen phosphate (KDP) crystals. Using absorption spectroscopy and chemical analysis, we determined the impurity distribution in the different growing sectors of KDP single crystals. The level of impurity was dependent on the starting materials and growth rate. We also studied the influence of impurities on the laser-induced damage in fast grown KDP. The laser damage threshold in the impurity- rich prismatic sector is same as in the high purity pyramidal sector within the experimental error. Meanwhile, the laser damage threshold (LDT) at the boundary of the prismatic and pyramidal sectors is less than half of that in the bulk. Furthermore, we found that the thermal annealing of the crystal eliminated the weakness of this sector boundary and increased its LDT to the same level as in the bulk of the crystal. Our result suggests that laser damage occurred in the vicinity of a high, localized strain field.
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Ming Yan, Ming Yan, Richard A. Torres, Richard A. Torres, Michael J. Runkel, Michael J. Runkel, Bruce W. Woods, Bruce W. Woods, Ian D. Hutcheon, Ian D. Hutcheon, Natalia P. Zaitseva, Natalia P. Zaitseva, James J. De Yoreo, James J. De Yoreo, } "Investigation of impurities and laser-induced damage in the growth sectors of rapidly grown KDP crystals", Proc. SPIE 2966, Laser-Induced Damage in Optical Materials: 1996, (13 May 1997); doi: 10.1117/12.274277; https://doi.org/10.1117/12.274277
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