Studies on the synthesis growth Characterization and irradiation Effects of some organic nonlinear Optical crystals

Abstract

There is a need for new lasers with exciting combination of light newlineproperties such as wide spectral tuning ranges and large bandwidth for newlinecommunication systems While a variety of materials including inorganic newlineorgano metallic organic and polymeric have been studied for their NLO newlineactivity the organic materials have been receiving the maximum attention newlinebecause of their ultra fast response time photo stability and large first order newlinehyper In this direction organic NLO crystals were grown by conventional low temperature solution growth technique The essential properties such as optical transparency and the second harmonic generation for the grown crystals have been verified by recording optical newlinetransmission spectra and measuring SHG efficiency using Kurtz Perry newlinepowder method Some of the grown crystals were subjected to swift heavy ion newlineirradiation and the effects were studied mainly focusing on the dielectric newlineconstant This thesis is structured into seven chapters newlineThe first chapter deals with the introduction of crystal growth newlineMethods nonlinear optics some aspects of nonlinear interactions materials newlinePerspective characterization tools involved theory of hyperpolarisability newlinecalculations and methodology of swift heavy ion irradiation newlineThe second chapter presents the synthesis and growth of newlineL asparaginium picrate LASP crystals grown by slow evaporation solution newlinegrowth technique Single crystals of LASP have been grown newline