We fabricate semi-insulating lnGaAs/GaAs multiple quantum wells and measure the two-wave mixing gain and the four-wave mixing diffraction efficiency at the wavelengths around the excitonic resonance of 0.93 µm. The important properties including spatial resolution, saturation intensity and response time are experimentally investigated. The photorefractive response time of 100 µs is obtained at the wavelength of 924.5 nm with the intensity of 7 mW /cm2.

© 1999 Optical Society of America

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