Growth spectral computational and thermal studies of organic nonlinear optical single crystals

Abstract

In the current scenario, the invention of the laser has paved the way newlinefor the discovery of new nonlinear optical materials, making optoelectronics newlineone of the fastest growing fields. Many new devices made of nonlinear optical newlinematerials are being developed in a rapid manner. Organic Nonlinear Optical newline(NLO) crystals, in particular, are gaining popularity due to their high NLO newlinecoefficient, high damage threshold and high thermal stability. The presence of newlinedelocalized - electron systems connecting donor and acceptor groups is newlineresponsible for the microscopic origin of nonlinearity in organic molecular newlineNLO crystals. The efficiency of second harmonic generation is improved by newlinedelocalized - electron systems, which have a wide range of applications in newlinelaser technology and optical storage. Hence, the present work aimed to grow newlineorganic nonlinear materials Nicotinohydrazide, N-Acetyl-L-Glutamine, newlineN-Acetyl-L-Leucine and N-Allylthiourea. These crystals were grown by slow newlineevaporation technique. The experimental and theoretical calculations were newlinedone in order to study the nonlinear property of the material in wide manner. newlineThis thesis consists of six chapters; the first chapter explains the newlineimportance of crystals in the applications of optoelectronic industries and also newlinethe various crystal growth techniques. Also, the discussion on the nonlinear newlineoptical property of the material has been done. The basic principle and newlineinstrumentation technique of X-ray Diffraction, Fourier Transform infrared, newlineRaman, Ultraviolet-visible, Thermogravimetric Analysis, Differential newlineThermal Analysis, Photoluminesence, Kurtz-Perry powder and Z-scan study newlineare presented. newline