Review on Theoretical Aspect of Nonlinear Optics

Nonlinear optical (NLO) materials play a major role in the field of photonics including optical information processing, sensor protector applications, data storage etc. Some organic compounds exhibit large NLO response, in many cases, orders of magnitude larger than widely known inorganic materials. The importance of amino acid in NLO application is due to the fact that all the amino acids, except glycine contain chiral carbon atom and crystallizes in noncentrosymmetric space group. Another added advantage of NLO active material is the presence of namely amino group and carboxyl group, which make it transparent in the UV-Visible region. Hence, this review paper presents theoretical aspect of nonlinear optics, solution growth of nonlinear crystals and the analysis of second order and third order NLO properties using Kurtz powder and Z-Scan technique.