Organic single crystals possess unique opto-electronic properties because organic molecules have delocalized electrons, namely, conjugated electron systems exhibit various photoresponses such as photoconductive, photovoltaic, photo catalytic behaviour and so on. The organic materials with intramolecular charge transfer compounds having large second order nonlinear optical effects. The organic compounds with electron rich (donor) and deficient (acceptor) substituents, provide the asymmetric charge distribution in the p electron system, show large nonlinear optical responses. Nonlinear optical crystals should meet several requirements, such as large phase-matchable nonlinear optical coefficient, a wide optical window around the visible region, mechanical and chemical stability and a high damage threshold. Some of these requirements based on molecular properties can be satisfied with the assistance of molecular design. It is possible to control the absorption edges of intramolecular charge transfer compounds by selecting the combination of donar and acceptor. Many of organic crystals have absorption in the blue light region and some of them have a cut-off wavelength more than 450 nm. This indicates the possibility of reduced conversion efficiency of SHG due to self-absorption of materials when using a semiconductor laser with 800 nm band. Organic materials are perceived as being structurally more diverse and therefore are believed to have more long-term promise than inorganics. A wide variety of organic materials are being investigated for frequency doubling. We have been concentrating on the growth of organic and semi-organic crystals for nonlinear applications, using low temperature solution growth technique.

We have grown N-bromosuccinimide single crystals for NLO applications. The growth experiments were carried out in a constant temperature bath with a set temperature (accuracy ± 0.01°C). As the grown crystal has a wide transparency range, that is, the absence of absorption in the visible region is a necessity for NLO. High quality and transparent crystals were grown and the grown crystals were subjected to XRD, FTIR, UV-VIS, Photoluminescence, mechanical and dielectric studies. The results will be presented in detail.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/9730 must be provided.

1. Growth of organic Non-linear optical crystal of p-aminoazobenzene (4- aminoazobenzene) by slow evaporation method
2. Characterization of swift heavy ion induced modification on the nonlinear optical Benzimidazole (BMZ) single crystals
3. Growth and characterization of electro-optic Glycine lithium sulfate single crystals
4. Swift heavy ion induced modification on the Optical, Mechanical and Dielectric behaviour of GLS single crystals
5. Growth of Unidirectional Semi-organic and Inorganic single crystals from solution by Sankaranarayanan-Ramasamy (SR) method and their characterization
6. Growth And Characterization of Nonlinear Optical L-Asparaginium Picrate Single Crystals.