GROWTH OF ORGANIC NONLINEAR OPTICAL-CRYSTALS FROM SUPERCOOLED MELTS - 2-CYCLOOCTYLAMINO-5-NITROPYRIDINE (COANP)

A supercooled melt growth was applied to the preparation of COANP single crystals. Within the metastable range at supercoolings smaller than 0.5-degrees-C, triangular a-plates with a thickness of 1-2 mm of optical quality were obtained. Rather low average growth rates of less-than-or-equal-to 1 mm/day were observed. The crystals have been characterized by optical and nonlinear optical measurements as well as by a preliminary X-ray topography.