Preparation, crystal structure and physicochemical characterization of a semi-organic l-glutamic acid lithium chloride single crystal for nonlinear optical applications

An l-glutamic acid lithium chloride (LGLC) semi-organic nonlinear optical crystal has been grown using a slow evaporation process. Single-crystal XRD investigations confirmed the orthorhombic crystal system of the LGLC crystal. Fourier transform infrared spectroscopy was used to find and confirm the presence of important functional groups in the synthesized crystal. A UV–Vis–NIR transmission spectrum in the 200–1100 nm band was used to characterize the crystal. Compared to the standard reference crystal KDP, the LGLC crystal’s SHG efficiency was 1.21 times greater. According to the TG–DTA results, the thermal stability of LGLC is 215 °C. A photoluminescence spectroscopy analysis documented the electron excitation in the grown crystal. The grown crystal surface characteristics were studied using scanning electron microscopy. Third-order nonlinear susceptibility χ⁽³⁾ = 2.154 × 10^–8 of LGLC grown crystal was utilized to estimate the values for third-order NLO characteristics and its suitability in NLO applications.