Structural, spectral, thermal and nonlinear optical analysis of potassium tartrate hemihydrate crystal

The semi-organic, non-linear optical (NLO) single crystals of potassium tartrate hemihydrate (PTH) were grown successfully by solvent evaporation method. It crystallizes in monoclinic crystal system. Functional group vibrations were analysed through FT-IR and FT–Raman spectroscopy. Molecular structure was established by NMR spectroscopy. PTH is transparent from 190 to 1100 nm. Thermal characteristics of PTH was analysed by TGA/DTA. SHG capability of PTH was tested by Kurtz–Perry method and the frequency doubling efficiency is measured as 0.9 times that of KDP. Third order nonlinear susceptibility (χ3) is found by Z scan method. Wide transmission bandwidth coupled with good thermal stability and favorable NLO properties of the crystal may be exploited to make photonic devices.