Abstract
Degenerate four-wave mixing (DFWM) in GaAs/AlGaAs multiple quantum wells (MQWs) has been demonstrated in forward and backward configurations using pulsed lasers and with cw lasers in the forward configuration.1, 2 In bulk GaAs, DFWM has only been demonstrated at a low temperature with pulsed lasers.3 We report the first demonstration of cw backward DFWM in room temperature bulk GaAs and GaAs/AlGaAs MQW samples. The DFWM reflectivity is measured in the band gap region as a function of laser wavelength with intensity as a parameter. When the MQW samples are pumped at intensities sufficient to saturate the light and heavy hole excitonic resonances, a dispersive DFWM spectrum is observed, consistent with conduction band only contributions.4
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