GEL GROWTH OF 2-AMINO-5-NITROPYRIDINIUM DIHYDROGEN PHOSPHATE ORGANOMINERAL CRYSTALS - X-RAY AND NONLINEAR OPTICS CHARACTERIZATION

2-Amino-5-nitropyridinium dihydrogen phosphate (2A5NPDP) is an organom ineral material presenting interesting quadratic optical nonlinear pro perties, in particular towards second harmonic generation. Single crys tals have been grown by spontaneous nucleation in tetramethoxysilane g el by slow cooling. X-ray characterization provides evidence of their good crystalline quality. Second harmonic generation experiments at 1. 34 mu m have confirmed the efficiency of these crystals and permitted inferring the d(15) and d(24) coefficients from the susceptibility ten ser.