Optical, Thermal and Electrical Studies on L-Malic Acid Doped ADP Single Crystals for Non-Linear Optical Application

Abstract

Ammonium Dihydrogen Phosphate (ADP) is one of the most popular crystals used for nonlinear optical (NLO) applications. ADP crystal is of more appeal due to its piezo-electric property. ADP crystals attract more interest because of their unique nonlinear optical, dielectric and anti-ferroelectric properties. The L-Malic acid doped ADP (LMADP) single crystals were grown by slow evaporation method at room temperature. The Crystalline nature of the grown LMADP crystal has been studied by powder XRD analysis. A Fourier transform infrared (FT-IR) study confirms the functional groups of the crystals. The second harmonic generation efficiency of the crystals was determined by NLO studies. The UV-visible study confirms the wide optical transmittance window for the doped crystals imperative for optoelectronics applications. TG/DTA analyses were carried out to characterize the melting behavior and stability of the title compound. The electrical properties of the grown crystal have been analyzed by dielectric constant and dielectric loss with frequency. Introduction. Ammonium dihydrogen phosphate (ADP) is a well-known anti-ferroelectric crystal. The study of ADP crystal is very interesting in view of the dielectric, piezo-electric and optical properties. Growth and studies of ammonium dihydrogen phosphate (ADP) crystal is a favorite topic to researchers because of its unique properties and wide applications. Single crystals of ADP are used for frequency doubling and frequency tripling of laser systems, optical switches in inertial confinement fusion and acoustic-optical devices [1,2]. ADP has been the subject of a wide variety of investigations over the past decades. Reasonable studies have been done on the growth and properties of pure ADP. In the light of the research work being done on ADP crystals, to improve the properties, the present work focuses on L-malic acid as a dopant in ADP and this is expected to enhance the nonlinearity of the crystal. In the last decades, many researchers have tried to found varieties of new NLO materials for laser applications [3]. Nonlinear optical (NLO) materials play a major role in information technology and industrial applications. L-Malic acid doped with ADP will be of special interest as a fundamental building block to develop complex crystal with improved NLO properties. The grown crystals were characterized by PXRD, FTIR, TG/DTA, Dielectric studies, UV-vis spectroscopy and NLO Studies.