GROWTH IMPEDENCE AND SHG STUDIES OF ALUMINIUM FLOURIDE DOPED SODIUM FLUORO ANTIMONATE CRYSTALS

Abstract

Single crystals of sodium fluoro antimonate and aluminium fluoride doped sodium fluoro antimonate were grown by solution method with slow evaporation technique. Complex impedance has real part of impedance (Z') and imaginary part of impedance (Z'') and these values have been measured using an impedance analyzer at different frequencies and temperatures. Variations of real and imaginary part of impedance (Z') and (Z'') with frequency for ASFA13 crystal at different temperatures are plotted. Nyquist plots have been drawn between Z' and Z'' and these plots are presented. From plots the grain boundary resistance for the sample are obtained to be 50 x103 Ω at 30°C, 10x103 Ω at 50°C, 5x107 Ω at 70°C and 1.3x108 Ω at 90°C. The relative second harmonic generation (SHG) efficiency was measured by Kurtz powder technique using an Nd: YAG laser operating at 1064 nm. The relative SHG efficiency value of ASFA13 sample found to be 0.65 times that of KDP.