Second harmonic generation of a new nonlinear optical material l-valine hydrobromide

Synthesis and single-crystal growth of a new nonlinear optical crystal l-valine hydrobromide (VHBr) is reported here. Low-temperature solution growth method was employed to grow bulk single crystal of VHBr. The grown crystals were characterized by single-crystal X-ray diffraction analysis, Fourier transform infrared, UV-Vis-NIR spectral studies and dielectric measurement. Thermal stability of VHBr has been studied by DTA-TG and DSC analysis. DSC studies reveal the possibility of ferro-para phase transition in VHBr at 118 °C, which is further confirmed by dielectric measurement with respect to temperature. Kurtz powder second harmonic generation (SHG) measurement confirms the nonlinear optical (NLO) property of the grown crystal and SHG value is comparable to urea. Morphology of the grown crystal is also determined by using crystallographic data.