BaTiO3 Developments: 1) Seeded Stimulated Photorefractive Scattering, And 2 ) Photoluminescence

Optical phase conjugation via stimulated scattering has been previously demonstrated in Brillouin, Raman, and photorefractive media. In Brillouin and in Raman media, the mechanism for the optical non-linearity is well­ understood1, while in photorefractive media, the details of the charge transport mechanism are largely unknown. Photoluminescence and the wavelength dependence of steady­ state and transient phase-conjugate reflectivities in variously-doped and undoped crystals can be used to discriminate between photorefractively active and inactive impurity and defect centers.