“…However, organic compounds frequently suffer from volatility, poor thermal stability, poor mechanical strength and undesirable growth habit, making them unattractive for device fabrication. In order to overcome these difficulties, semi-organic materials have been proposed in which the high optical nonlinearity of a purely organic compound is combined with the favorable mechanical and thermal properties of inorganics [4]. Among the semi-organic nonlinear optical materials, metal complexes of thiourea have received much attention because they can be used as better alternatives for KDP crystals in frequency doubling and laser fusion experiments [5,6].…”