Excitonic Optical Nonlinearities, Four Wave Mixing and Optical Bistability in Multiple Quantum Well Structures
Spatial confinement of optically generated free carriers and excitons in low dimensional semiconductors can result in enhanced nonlinear optical phenomena1. This is of practical consequence for optical switching devices2, mode-locking of semiconductor lasers3 and phase conjugation. For instance, confinement of excitons in GaAs/AlGaAs multiple quantum well (MQW) structures leads to clearly resolved absorption features at room temperature; nonlinear absorption and refraction can be observed at wavelengths close to these features at less than a milliwatt of incident c.w. optical power1.
KeywordsDiffraction Efficiency Refractive Index Change Optical Bistability Multiple Quantum Well Phase Conjugate
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