Since the original prediction and discovery of phase conjugation via backward stimulated photorefractive scattering (BSPS),1 this effect has not been reported in additional crystals of BaTiO3. Here we report the observation of a larger although sometimes unsteady BSPS phase conjugate reflectivity of up to ~20% in another BaTiO3 crystal sample and show that the BSPS reflectivity can be stabilized and/or appreciably enhanced by the purposeful injection of either phase conjugate or partially noisy seeds. By analogy with stimulated Brillouin scattering, we explain that these reflectivity enhancements result from small amounts of feedback which can dramatically lower the threshold for stimulated scattering processes.2

© 1989 Optical Society of America

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