Refractive indices of photorefractive bismuth titanate, barium-calcium titanate, bismuth germanium oxide, and lead germanate

The refractive indices of photorefractive bismuth titanate, barium-calcium titanate, bismuth germanium oxide, and lead germanate are measured in the range from 450 to 700 nm using the method of minimum deviation. The results are fitted to the Sellmeier equation and the parameters are given.