Growth and optical studies of tris (thiourea) potassium barium sulphate crystal: a novel semiorganic NLO bimetallic crystal

Abstract

A novel tris (thiourea) potassium barium sulphate (TTPBS) complex has been synthesized and the complex formation was confirmed by means of spectroscopic analysis. The TTPBS single crystal has been grown by most commercial slow solvent evaporation method. The single crystal X-ray diffraction technique has been employed to confirm the crystal structure and unit cell dimensions of TTPBS crystal. The functional groups of grown crystal have been identified by means of Fourier transform infrared analysis. The constituent elements of title crystal have been determined by means of EDS technique. In UV–visible studies the TTPBS crystal has been testified within 200–900 nm to examine the optical transparency and determine the optical band gap. The frequency conversion efficiency of TTPBS crystal has been assessed by means of Kurtz-Perry test. He–Ne laser assisted Z-scan technique has been employed to ascertain the third order nonlinear optical (TONLO) refraction and absorption effect in TTPBS crystal. The magnitude of TONLO refractive index (n ₂), absorption coefficient (β) and susceptibility (χ³) of title crystal has been illustrated using the Z-scan data. The Nd:YAG laser facilitated surface damage threshold of TTPBS crystal has been determined and it is found to be in MW/cm² range.

Keywords:

• Crystal growth
• optical studies
• nonlinear optical materials
• organometallic crystal

Acknowledgement

Authors are very much grateful to Dr. S. Kalainathan, VIT University, Vellore, India for extending the research facilities. Author Mohd Anis acknowledges UGC, New Delhi, India for awarding the Maulana Azad National Fellowship (F117.1/2015-16/MANF-2015-17-MAH-68193).