We report a 27:1 switching contrast ratio with 2.5 mW of power in an asymmetric Fabry–Perot étalon. The modulation is achieved by optical saturation of the excitonic absorption profile of a 95 Å GaAs/AlGaAs multiple quantum well structure grown on a high-reflectivity dielectric stack mirror.
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Heffernan et al. (1991) studied this question.
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