Growth and characterisation of benzoic acid family crystals for non linear optical applications

Abstract

were rapidly influenced by the field of nonlinear optics. The Nonlinear optical property of certain materials plays an important role in various optical device applications which leads to the increase of the nonlinear optical materials. So the search for many new nonlinear optical materials too increased. In the meantime artificial non linear optical crystals were synthesized in laboratories and their efficiency was studied by doing various characterizations. Modifications were done to design a newer one for necessity of the current industrial purpose. In nonlinear optical field, many kinds of organic nonlinear optical crystals were grown and their investigations were reported for the past two decades, all the reports clearly point out that the organic materials exhibit very high optical nonlinearity. Benzoic acid family crystals were synthesized by slow evaporation solution method and their various characterizations of the three nonlinear optical crystals forms the basis of the present work. All the three were organic materials, based on amino acids 2-Aminopyridinium 4-Aminobenzoate (2AP4AB), 3- Chloro benzoic acid (3CBA) and Hippuric acid (HA). The grown crystals of Benzoic acid family were subjected to X-ray diffraction, Thermo gravimetric-Differential thermal analysis, Ultraviolet- Visible, Fourier Transform Infra red, Nonlinear optical studies like Kurtz powder test for second harmonic generation, Z-scan measurement technique for third order harmonic generation and Laser damage threshold. In other hand by using Computational methods like crystallography, molecular geometry, HOMO-LUMO, Hirshfeld surface analysis, Molecular electrostatic potential mapping were done and their results were discussed. newline