Synthesis and characterization of l-asparagine monohydrate potassium dichromate (LAMPDC): novel material for optical limiting applications

A semi-organic nonlinear optical single crystal known as l-asparagine monohydrate potassium dichromate (LAMPDC) has been created and formed in an aqueous solution using a slow evaporation process at room temperature. Details on the crystal structure were discovered using single-crystal XRD and it was found to be (LAMPDC) crystallized in an orthorhombic system with space group P2(1)2(1)2(1). By using FT-IR analysis, the coordination of functional groups in the formed crystal was discovered. The optical bandgap energy E-g was assessed and the UV-absorption measurements demonstrate the crystal's transparency in the visible region and a lower cutoff wavelength was found to be 253 nm (4.9 eV) and 366 nm (3.38 eV). The luminescence behavior of LAMPDC has been analyzed by fluorescence (FL) spectral study. The produced crystals were subjected to the Vickers microhardness test, which allowed for the evaluation of the Vickers hardness number (H-v), work-hardening coefficient (n), yield strength (sigma(y)), and stiffness constant C-11. Various frequencies between 50 Hz and 20 MHz have been used to determine the dielectric behavior of LAMPDC. The surface morphology of the as-grown crystal was determined using the SEM technique. The laser-induced damage threshold value was found to be 4.79 times higher than that of KDP. In comparison with KH2PO4, the grown sample has an SHG efficiency that is 0.59 times higher. Using the Z-scan method with a nano-pulsed Nd:YAG laser, the crystal's third-order nonlinear optical properties are investigated. The substance exhibits sequential two-photon absorption or an excited state absorption. LAMPDC is a possible contender for optical limiting devices due to its higher nonlinear absorption coefficient (1.73 x 10(-10) m/W) and lower onset optical limiting threshold (1.42 x 10(12) W/m(2)).