Dispersion of the electro-optic properties of cerium-doped Sr0.61Ba0.39Nb2O6

The product of the linear electro-optic coefficient with the electron-hole competition factor r33ζ is determined as a function of the wavelength together with the photorefractive trap density Neff in cerium-doped strontium barium niobate. The photorefractive method of photoinduced light scattering is applied. A pronounced increase of r33 by more than a factor of 2 is self-evident in the blue-green spectral range, which is described by a theoretical approach based on the combination of the Sellmeier formulation and the polarization tensor concept. By this further important material parameters are estimated, such as the strength and frequency of the average dipole oscillator characterizing the optical interband transfer.