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Spatial-harmonic gratings at high modulation depths in photorefractive quantum wells

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Abstract

High-order spatial harmonics of photorefractive gratings are detected directly in multiwave mixing experiments in photorefractive AlGaAs/GaAs quantum wells operating in the Franz–Keldysh geometry. We have observed diffraction signals from the first-, second-, and third-harmonic refractive-index gratings. The quadratic electro-optic effect in the quantum wells guarantees a strong nonlinear response for generating a second-spatial-harmonic grating.

© 1991 Optical Society of America

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