Unidirectional growth of l-asparagine monohydrate single crystal: First time observation of NLO nature and other studies of crystalline perfection,optical, mechanical and dielectric properties |
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Authors: | Mohd. Shakir B. Riscob K.K. Maurya V. Ganesh M.A. Wahab G. Bhagavannarayana |
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Affiliation: | 1. Materials Characterization Division, National Physical Laboratory, Council of Scientific and Industrial Research, New Delhi 110 012, India;2. Crystal Growth Laboratory, Department of Physics, Jamia Millia Islamia, New Delhi 110025, India;3. Department of Physics, Kakatiya University, Warangal 506 009, India. |
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Abstract: | L-asparagine monohydrate (LAM), a new amino acid single crystal, was grown by slow evaporation solution technique (SEST) as well as by recently invented Sankaranarayanan–Ramasamy (SR) method in aqueous medium. Using SR method, LAM single crystal of diameter ∼18 mm and length ∼52 mm was grown for the first time. The growth conditions were optimized and the maximum growth rate of 1.0 mm per day was observed for the SR crystal. The crystal structure was confirmed by powder XRD. The crystalline perfection was assessed by high resolution XRD and etching studies and found that the quality of the SR crystal is better than the SEST crystal. The UV–vis–NIR spectroscopic study revealed that the SR crystal has good optical transparency than that of SEST crystal. The relative second harmonic generation efficiency was measured and found to be ∼0.35 times to that of KDP. The laser damage threshold (LDT) was measured and found that the SR crystal has higher LDT value (5.76 GW cm−2) than SEST crystal (4.75 GW cm−2). The Vickers’s microhardness and dielectric studies were also carried out and discussed. |
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Keywords: | A1. High resolution X-ray diffraction A2. Single crystal growth A2. Growth from solutions B1. Organic compounds B2. Nonlinear optic materials |
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