Abstract

Recently Mullen et al.¹ reported externally SPBS (stimulated photorefractive backscattering) in 0°-cut cobalt-doped BaTiO₃ (barium titanate) with reflectivities as high as ~60%. We report, for the first time, externally SPBS in KNbO₃ (potassium niobate). In addition, we have improved the geometrical requirements for efficient FSPS (forward stimulated photorefractive scattering) by using a 45° crystallographic cut with the light polarization in the b-c plane. Measurements of iron- doped KNbO₃ show reflectivities as high as 50% and stable temporal operation.

© 1993 Optical Society of America