Crystal Research and Technology
Cryst. Res. Technol. 37 (2002) 1049 - Abstract -

C. V. Kannan, S. Ganesamoorthy*, S. Kumaragurubaran, C. Subramanian, R. Sundar**, P. Ramasamy

Crystal Growth Centre, Anna University, Chennai- 600 025, India
*Laser Materials Division, Centre for Advanced Technology, Indore-452 013, India
**Prototype Development and Pilot Production Division, Centre for Advanced Technology Indore-452013, India

Growth of Inclusion Free KTP Crystals by Top Seeded Solution Growth and their Characterization

KTiOPO4 single crystals of dimensions 34x15x15 mm3 have successfully been grown by Top Seeded Solution Growth (TSSG), using phosphate flux (K6P4O13), employing a home made vertical cylindrical three zone resistive heated furnace. Growth experiments were carried out with <001> seed orientation. A method to grow inclusion free crystal with less dislocation density is proposed, by employing cooling rate of 0.5-2 K/day and rotation rate of 60-30 rpm. UV-VIS transmission studies were performed and the dependence of absorption coefficient with wavelength is discussed. SHG elements of dimension 8x7.5x7.5 mm3 were fabricated and conversion efficiency of 58 % was achieved without antireflection coating. Nature of ionic conductivity and ferroelectric phase transition behavior of KTP crystals along the crystallographic polar axis in the frequency range of 100 Hz – 10 MHz are discussed.

Keywords: KTP, TSSG, ferroelectric phase transition, nonlinear optics


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