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Competition between forward- and backward-stimulated photorefractive scattering in BaTiO3

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Abstract

The gain–length product for two-wave mixing in photorefractive BaTiO3 is calculated as a function of the angles between a pump beam and a scattered beam and the crystal c axis. The gain–length product at times shortly after the pump is turned on often shows a maximum for backscattering, whereas the steady-state gain–length product is usually maximized for near-forward scattering (an angle of about 10° between the pump and scattered beams). The calculations suggest that backscattering will be optimized in a hole-dominated crystal with a large trap density.

© 1987 Optical Society of America

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