The investigation of potassium tetra thiourea chloride on linear-nonlinear optical, electrical and mechanical properties of KDP crystal for NLO applications

ABSTRACT

We aimed to investigate the influence potassium tetra thiourea chloride (PTTC) on optical, dielectric and thermal properties of potassium dihydrogen phosphate (KDP) crystals. It was found that by addition of PTTC SHG efficiency has been enhanced. In addition, third order nonlinear properties have been studied by open and close aperture Z-scan technique. The enhanced LDT of grown crystal is found to be 2.08 GW/cm². The dielectric response of grown crystal results lowers magnitudes. Thermal stability of grown crystal has been studied by TGA, DTA and DSC. The mechanical strength of doped crystals has been investigated by the Vickers microhardness studies and results are discussed.

KEYWORDS:

• Optical studies
• Z-scan
• NLO
• laser damage threshold
• microhardness studies and dielectric studies

Acknowledgments

The authors are also thankful to Dr. P.K Das, Department of Physical Chemistry, Indian Institute of Science (IISc), Bangalore, India for SHG Test. The authors are also thankful to Dr. Babu Varghese, IIT Madras for single crystal XRD analysis.

Funding

One of the authors is thankful for UGC (UGC/41-591/2012/SR), New Delhi for financial assistance.