Comparative studies of glycine added potassium dihydrogen phosphate single crystals grown by conventional and Sankaranaryanan–Ramasamy methods

Glycine added potassium dihydrogen phosphate (KDP) crystals have been grown by slow evaporation solution technique, slow cooling along with seed rotation and Sankaranaryanan–Ramasamy (SR) method. The size of the grown crystal in slow cooling method was 35 × 25 × 20 mm3 and in SR method it was 20 mm in diameter and 110 mm in length. The grown crystals were subjected to powder X-ray diffraction, UV–Vis, thermal analysis, Vickers microhardness, dielectric, laser damage threshold, higher resolution X-ray diffraction (HRXRD) and nonlinear optical (NLO) studies. All the grown crystals have good transparency in the entire visible region. In order to determine mechanical strength of crystal, Vickers micro-hardness measurement was carried out. Dielectric study reveals higher dielectric constant and low dielectric loss for SR method grown crystal. High laser damage threshold was observed in SR method grown glycine added KDP crystal compared to SR method grown pure KDP crystal. The second harmonic efficiency of the glycine added KDP is increased compared to pure KDP.

sFirst time 11 cm KDP crystal has been grown by unidirectional method. Quality of grown crystal superior than other method grown crystal.Figure optionsDownload high-quality image (221 K)Download as PowerPoint slideHighlights
► Bulk growth of glycine added KDP crystal has been grown three different methods.
► Higher growth rate (2 mm per day) and transmittance (77%) has been obtained in SR grown crystal.
► Addition glycine has enhanced crystalline perfection.