Optical and SHG Measurements of Aminoacids doped ADP NLO crystals
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.265
Optical and SHG Measurements of Aminoacids doped ADP NLO crystals R.Ananda Kumari SreeSiddaganga College of Arts, Science & Commerce, B.H.Road, Tumkur, Karnataka
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ABSTRACT
L-Arginine and L-Alanine aminoacids doped ADP crystals were grown from aqueous solution by slow evaporation technique at constant temperature. The crystalline nature of the grown crystals was confirmed using powder X-ray diffraction technique. The vibrational frequencies of the grown crystals were identified using FTIR spectral analysis. Optical absorption study was carried out and a good transparency in the entire visible region was observed with the lower cutoff wavelength of 308 nm and 318 nm for the LAlanine & L-Arginine doped crystals respectively. The transmission data has been used to evaluate the optical band gap of L-Alanine and L-Arginine doped ADP crystals and is found tobe 5.023 eV. Second harmonic generation (SHG) studies were performed by the classical Kurtz powder technique using a Nd: YAG laser operating at 1064 nm. The SHG efficiency of doped ADP is found to be higher compared to Pure ADP crystals.
INTRODUCTION Nonlinear optical (NLO) frequency conversion materials have a significant impact on laser technology,optical communication and optical storage technology. Ammonium dihydrogen phosphate (ADP) is a potential inorganic material having wide range of applications such as electro-optic modulators, harmonic generators and parametric generators [1-2]. The amino acids are organic materials for NLO application as they have donor carboxylic (COOH) group and the proton acceptor (NH 2) amino group, known as zwitter-ions. Therefore, amino acids can be used as dopants and it was observed 1
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that there is enhancement in the material properties such as NLO and ferroelectric properties [3]. In the light of research work being done on ADP crystals, and to improve their growth and other characterization, it was thought interesting to investigate the effects of amino acid materials L-Alanine & L-Arginine on growth and properties of ADP crystals for both academic and industrial uses.
EXPERIMENTAL DETAILS
Crystal growth Crystals were grown by dissolving AR grade ADP added with 1mole wt % LAlanine & L-Arginine separately in tripled distilled water with continuous stirring of 4 hours using magnetic stirrer. The complete dissolved solution was filtered using a microfilter. The solution was allowed to evaporate at a constant temperature of 350C using the constant temperature bath. Optically good quality large-size single crystals were obtained in a period of three to four weeks. All the grown crystals were found to be very stable, colourless and transparent. All the grown crystals exhibited scalenohedr
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