Abstract
Proline is a quite-recognized nonlinear optical material for different optoelectronics purposes. The present study investigates a single-crystal of proline doped with oxalic acid in varying ratios through the slow evaporation procedure. The crystallinity of proline oxalate (PO) single-crystal was determined by an X-ray diffraction (XRD) study. The shifting in frequency due to the supply of oxalic acid was examined through Fourier-transform infrared (FTIR) and FT-Raman spectroscopy. Scanning electron microscopy (SEM) was used to define the morphological properties of the PO single-crystal. The light transmission was studied in the UV–NIR spectral region. Also a fluorescence examination was performed. The Kurtz powder test established for the second harmonic generation (SHG) was carried out and showed, that the frequency shift was five times that of potassium dihydrogen orthophosphate (KDP). The investigation of the mechanical properties exhibits that the material refers to the soft kind. Thermal features had been studied by thermo-gravimetric analysis (TGA), differential thermal analysis (DTA) and differential scanning calorimetry (DCS) determining the melting point of the sample to be 185 °C.