Studies on the characterisation of l-proline thiourea monohydrate nonlinear optical single crystal

l-Proline thiourea monohydrate nonlinear optical single crystal of size 65 × 15 mm² was grown by slow evaporation technique at room temperature. The grown crystal was characterised by single crystal XRD, absorption spectrum, FTIR, EDAX, Vicker’s microhardness test, DSC, dielectric and photoconductivity studies. Second harmonic generation efficiency of the grown crystal makes it a higher order second harmonic material with good conversion efficiency. The reported crystal is an efficient nonlinear optical material with good optical transparency, thermal, mechanical strength and dielectric property.