We measured, for the first time to our knowledge, a net two-beam coupling gain in an organic crystal. Our photorefractive measurements were carried out in nominally pure organic crystals of 4-N, N-dimethylamino-4′-N′-methyl-stilbazolium toluene-p-sulfonate (DAST). Because of its large electro-optic coefficient, r₁₁ = 83 pm/V at λ = 750 nm, and a photoconductivity of up to σ = 6.7 × 10^-12 Ω^-1 cm^-1 at intensity I = 570 mW/cm², DAST showed a gain of 2.2 cm^-1 for an absorption of α = 1.8 cm^-1. With grating buildup times below 1 s at light intensities of 300 mW/cm², DAST is a promising candidate for photorefractive applications in the near infrared.

© 1996 Optical Society of America

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