Exploring an efficient nonlinear optical single-crystal L-Proline potassium pentaborate octahydrate (LPPPB) for optical limiting applications.

In the current investigation, L-Proline Potassium pentaborate octahydrate single crystals are successfully grown from aqueous solution by slow evaporation technique at ambient conditions. Single-crystal X-ray Diffraction technique proves that the LPPPB crystal belongs to monoclinic crystal system. The optical transparency is analyzed by UV–Vis–NIR spectroscopic technique. It exhibits 92.7% transparency of the title compound with a wide band gap of 6.4 eV. The different types of vibrations such as symmetric stretching, asymmetric stretching, wagging, rocking, intramolecular hydrogen bond interaction, and scissoring vibrations are well established by FTIR technique. The Z-scan technique is employed to assess the nonlinear absorption and refraction behavior of the LPPPB crystal. It declares the saturable absorption and self-defocussing behavior. The hardness number of the LPPPB crystal is calculated by Microhardness Study. The creditability of the LPPPB crystal for nonlinear optical device applications is proved by simultaneous TG–DSC analysis. [ABSTRACT FROM AUTHOR]