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In this study, the effect of doping the amino acids L-Alanine (L-Ala) and Glycine (Gly) on α-LiIO3 single crystal were presented. Previously have reported by us on improving the properties of α-LiIO3 crystal doped with L-arginine (L-Arg) and L-nitroarginine (L-NNA) [1]. Bulk crystals were grown both from solutions doped with different quantities (3 mol/% and 5 mol/%) of L-Ala and Gly and from pure solution of α-LiIO3. These grown crystals were studied by single-crystal X-ray diffraction, second harmonic generation, IR and UV-Vis spectroscopy methods. The XRD data of pure and doped crystals are in good agreement with the reported literature values of pure α-LiIO3 [2], indicating that doping with L-Ala and Gly does not violate the parameters of the crystal lattice. However, the presence of L-Ala and Gly in α-LiIO3 crystal can be identified due to IR spectra. From the grown crystals, 1 mm plates were cut with planes perpendicular to the z and y axes, and their UV-VIS spectra were recorded. In the range of 340-800 nm, pure α-LiIO3 (z) crystals exhibit lower transmittance compared to α-LiIO3: Gly (z) and higher compared to α-LiIO3: L-Ala (z) crystals. This trend holds true for both 3 mol/% and 5 mol/% dopant concentrations. In the case of plates cut perpendicular to the y-axis, no observed improvement in transmittance is noted within the same range. When doped with Gly the optical quality of the crystals was improved and growth rate was increased. The second harmonic generation activity of the crystals α-LiIO3 grown with L-Ala and Gly dopants is higher than that of pure α-LiIO3.
Acknowledgments: This work is supported by the Ministry of science and education RA, projects No. 25RG-2F039.
