Growth of Potassium Titanyl Phosphate (KTP) From Molten Tungstate Solutions.

A flux process, employing molten tungstic anhydride, has been used to grow single crystals of the nonlinear optical material potassium titanyl phosphate. "KTP" has been found to be the single stable phase when melts are slow cooled over the temperature range 1000-700C. Single crystals ranging in size up to 1 cm (3) have been produced. Lattice parameter, crystal morphology and optical absorption date are presented along with some preliminary results on optical second harmonic generation utilizing both 1.06 micrometer and 1.325 micrometer radiation.