Reflection-geometry photorefractive quantum wells.
We present what is to our knowledge the first demonstration of photorefractive AlGaAs/GaAs quantum wells operated in the reflection geometry, using the quantum-confined Stark effect. This photorefractive geometry relies on volume reflection gratings of a small number of periods written in a nonstoichiometric multiple-quantum-well layer with counterpropagating beams. Combined absorptive and photorefractive twowave mixing gains as large as 1500 cm(-1) are observed under reverse bias of the diode.
Nolte
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Lahiri
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Melloch
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MR