Abstract
New results on GaInAs-GaInAsP multiple quantum well (MQW) spatial light modulators are reported. The device structure consists of 50 periods of MQW enclosed in an asymmetric Fabry-Perot (FP) micro-cavity 80-98%. An input diffraction efficiency of 2% is measured in a degenerate four-wave-mixing configuration with a pulse energy of 1 µJ cm-2, in comparison with only 2×10-3% measured on the reference device where the front reflectivity of the FP is close to zero: embedding an MQW device in a short micro-cavity enhances the diffraction efficiency by a factor of 1000.
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