J. Bodzenta, M. Dzida and T. Pustelny
J. Phys. IV France 137 (2006) 259-263
Photothermal measurement with mirage effect for investigation of LiNbO3 single crystalsJ. Bodzenta and M. Pyka
Department of Applied Physics, Institute of Physics, Silesian University of Technology, Boleslawa Krzywoustego 2, 44-100 Gliwice, Poland
(Published online 23 December 2006)
Results of measurements of the thermal diffusivity of pure and doped lithium niobate single crystals are presented. A reference sample was a pure crystal. The others were doped with: Cu (0.05%at.), Dy (0.1%at., 1.0%at., and 1.7%at.), and Er + Yb (1.0%at. Er + 1.0%at. Yb) ions. Thermal properties were determined in ,  and  crystallographic directions. Experimental studies were carried out using photothermal method based on mirage effect. This method based on determination of a phase lag connected with propagation of a thermal wave in investigated sample. Obtained results showed considerable anisotropy of the thermal diffusivity of pure crystal and doped samples. The thermal properties in  direction (c-axis) is higher than in directions perpendicular to it. Unexpectedly, anisotropy of the thermal diffusivity in plane (001) was also observed.
© EDP Sciences 2006