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We report photorefractive two beam coupling gain coefficients as high as Γ=19 cm−1 and net gains of Γ-α=14 cm−1 in InP:Fe at around 970 nm. This enhancement was achieved by combining band-edge resonant nonlinearities with a second resonant enhancement derived from the bipolar transport in this material. Measurements of gain as a function of pump intensity, applied field, grating spacing, wavelength, and temperature are presented. No moving gratings were required.
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Millerd et al. (1990) studied this question.
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