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Growth and characterization of metal ions and dye doped KDP single crystals

P. KUMARESAN1,2, S. MOORTHY BABU1,* , P. M. ANBARASAN3

Affiliation

  1. Crystal Growth Centre, Anna University, Chennai-600 025, India
  2. Department of Physics, Adhiparasakthi Engineering College, Melmaruvathur-603 319, India
  3. Department of Physics, Periyar University, Salem, India

Abstract

The organic dyes (Amaranth, Rhodamine and Methyl Orange) were introduced in KDP crystals. Influence of supersaturation and dye concentration in the solution, on the color and crystal habit of KDP, were observed. Amaranth in the solution at low super saturation and high dye concentration colored the pyramidal section (101) of the crystals. The highly supersaturated solutions produce entirely colored crystals. Metal ions (Al3+, Na+) doped KDP crystals were also grown by solution growth technique. The concentration of dopants in the mother solution was varied from 0.1 mole% to 10-mole %. The studies on pure and doped KDP crystals clearly indicate the effect of dopants (Al3+, Na+) on the crystal structure, in the absorption of IR frequencies and the non-linear optical property. The frequencies with their relative intensities are obtained in FT-IR of pure and doped KDP. The very weak bands for dopants indicate its presence in low concentration. The absence of even such a weak band in the case of KDP doped with AlPO4 indicates the strong interaction of Al3+ ion with O–H groups. The calculated IR frequency 3333 cm–1 for O–H stretching was in close agreement with the experimentally obtained one for pure KDP at 3340 cm–1.The doped crystals show good second harmonic generation efficiency. The dopants increase the hardness value of the material, which also depends on the concentration of the dopants. Dye doping improves the NLO properties of the grown crystals. Results of the growth kinetics of KDP crystals in the presence of impurities are also discussed..

Keywords

Growth from solutions, Single crystal growth, Non-linear optical materials, Dye doped KDP.

Submitted at: Jan. 9, 2007
Accepted at: Sept. 18, 2007

Citation

P. KUMARESAN, S. MOORTHY BABU, P. M. ANBARASAN, Growth and characterization of metal ions and dye doped KDP single crystals, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 9, pp. 2774-2779 (2007)