Stationary Photorefractive Self-Pump Phase-Conjugation with Stimulated Backward Scattering in LiNbO₃:Fe Crystals

Stationary photorefractive self-pumped phase-conjugation with one four-wave-mixing interaction region, stimulated by the photorefractive amplified backward scattering, is obtained in LiNbO₃:Fe crystals, in which the strong backward scattered light is gotten by putting a scattering particle on the backface of the sample. Even though its reflectivities are not high (its temporal and stationary reflectivities are 10% and 3%, respectively), due to the low electrooptic coefficients of LiNbO₃:Fe crystals, our experimental results prove that this mechanism is effective and simple comparing with the “cat ”self-pumped phase-conjugator.