SYNTHESIS, CRYSTAL-STRUCTURE AND NONLINEAR-OPTICAL PROPERTIES OF 2-AMINO-5-NITROPYRIDINE-L-(+)-TARTRATE, A NEW 2ND-HARMONIC-GENERATION CRYSTAL

A new second-harmonic-generation (SHG) crystal 2-amino-5-nitropyridine-L-(+)-tartrate (ANPT) has been synthesized and its crystal structure determined by X-ray structure analysis. ANPT showed broad transparency, a high degree of hardness and a high melting point, which are preferred for non-linear optical (NLO) devices. The optical axes and refractive indices of ANPT were determined by analyses of reflective polarized light intensity changes depending on both the direction of incident polarized light and the configuration of crystal reflective surface. The crystalline NLO coefficient of ANPT was determined by the Maker fringe method as d33 = 41 pm V-1 at 1.06 mum.