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Growth and characterization of novel semiorganic nonlinear optical crystals of L-phenylalanine hydrochloride (LPHCl)

F. Yogam, I. Vetha Potheher, A. Cyrac Peter, S. Tamilselvan, A. Leo Rajesh M. Vimalan and P. Sagayaraj

Semiorganic nonlinear optical (NLO) material, L-phenylalanine hydrochloride (LPHCl) single crystals of dimension 42 × 8 × 6 mm3 have been grown by slow evaporation technique, and are reported for the first time. The grown crystal was confirmed by single crystal X-ray diffraction and FT-IR analysis. Optical absorption spectrum shows very low absorption in the entire visible region and the cut-off wavelength is occurs at 350 nm. The optical energy gap is found to be 3.7 eV. The optical behaviour of the grown crystal was analyzed by PL study. The second harmonic generation of the grown crystal was confirmed by Kurtz and Perry powder technique. TG/DTG analyses confirm the two stages of decomposition in the sample and it further proves the relatively high thermal stability (229ºC) of the crystal in comparison to other NLO crystals of amino acid family. The frequency dependent dielectric properties of the crystal were studied for different temperatures.

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