Picosecond Repetitive Optical Switching Using Type II AlGaAs/AlAs Multiple Quantum Well Structures

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Abstract
Highly repetitive picosecond optical switching operation is demonstrated at room temperature using type II AlGaAs/AlAs multiple quantum well structures. The type II system realizes both large optical nonlinearity and rapid recovery of absorption saturation. More than 10 successive lps optical switchings are observed with a 12 ps interval at the energy density level of ∼1 µJ/cm2. The repetitive optical switching operation is based on the balance between the bleaching due to the phase space filling and the induced absorption caused by real space charge transfer.