Single Crystal Growth of Potassium Titanyl Arsenate (KTA) for Nonlinear Optics

摘要

This program was directed to the hydrothermal crystal growth of the nonlinearoptical material potassium titanyl arsenate, KTiOAsO4. The solubility and phase relations were investigated for selected K/As ratios in KH2 AsO4 -KOH solutions over a temperature range of 300-600 deg C and 10,000-30,000 psi. The P-V-T data were generated and extrapolated for use in gold liners and Rene' 41 autoclaves with a pressure balancing method. All data were transferred to 1.5 inch diameter x 18 inch long autoclaves. Growth runs were made for 7-10 weeks under a gradient of 30 deg C with a 10 molar KH2AsO4 mineralizer. We have grown crystals of 18 x 18 x 35 mm at rates of up to lmm/side/week. The crystals were single domain, high internal quality, and water white. A final production process was developed, crystals were tested in different OPO applications and results reported in several papers.