Comparative study on L-asparagine monohydrate doped ADP crystals

Good quality ammonium dihydrogen phosphate single crystals added with 1 mol% of L-asparagine morrohydrate in the mother solution were grown from solutions by slow evaporation, slow evaporation along with seed rotation and Sankaranarayanan-Ramasamy method with the vision to improve the properties of the crystals. The growth rate of Sankaranarayanan-Ramasamy method grown crystal was four times higher than the slow evaporation grown crystal. The grown crystals were found to be transparent in the entire visible region. Thermal stability is higher for L-asparagine monohydrate-added ammonium dihydrogen phosphate crystals. Higher hardness has been obtained for the Sankaranarayanan-Ramasamy method grown unidirectional crystal. Slow evaporation along with seed rotation method and Sankaranarayanan-Ramasamy method grown single crystals have low dielectric loss compared to slow evaporation method grown crystal. The second harmonic efficiency was measured for all the crystals and there was no measurable difference obtained between them. (C) 2009 Elsevier B.V. All rights reserved.