Dresden 2006 – scientific programme

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DF: Dielektrische Festkörper

DF 10: Electric, Electromechanical and Optical Properties I

DF 10.6: Talk

Thursday, March 30, 2006, 16:30–16:50, M{\"U}L Elch

Dispersion of the electrooptic properties of Cerium-doped Strontium-Barium-Niobate — •K. Bastwöste¹, M. Imlau¹, and M. Goulkov² — ¹Fachbereich Physik, Universität Osnabrück, Barbarastrasse 7, D-49069 Osnabrück — ²Institute of Physics, Kiev, Ukraine

The electrooptic coefficient r and the photorefractive trap density N_eff are determined as a function of the wavelength in Cerium-doped Strontium-Barium-Niobate (SBN:Ce) by applying the photorefractive method of photo-induced light scattering. A pronounced increase of r is found in the blue-green spectral range, which is described by a combination of the Sellmeier formulation and the polarization tensor concept. Thus, the strength and energy of the average dipole oscillator characterizing the optical interband transfer are estimated with f_e=(2± 0.5)· 10³¹ s⁻² and E_e = (3.7± 0.26) eV. The increase of r with decreasing wavelength equals to already reported results for electrooptic crystals. Nevertheless, the strong increase by more than a factor of two is remarkable compared to an increase of 16 % in LiNbO₃:Fe [1] and 38 % in BaTiO₃ [2]. The dispersive behavior of N_eff is discussed in the context of the results of undoped SBN and interband photorefraction [3].

Financial support from the Deutsche Forschungsgemeinschaft (DFG, project GRK 695).

[1] S. Fries, S. Bauschulte, Phys. Stat. Sol. 125, 369 (1991).

[2] A. R. Johnston, J. Appl. Phys. 42, 3501 (1971).

[3] M. D. Ewbank,R. R. Neurgaonkar, W. K. Cory, J. Feinberg, J. Appl. Phys 62, 374 (1987).