We have fabricated photorefractive InGaAs/GaAs multiple quantum wells operating at a wavelength of 1064 nm and have characterized its photorefractive properties in the Franz-Keldysh geometry. A maximum gain coefficient of 200 cm<sup>-1</sup> and a maximum four-wave mixing diffraction efficiency of 0.07% are obtained at an applied field of 15 kV/cm. Adaptive vibration measurement in a two- wave mixing configuration has also been demonstrated. The noise equivalent surface displacement of our measurement system is estimated at about 1.5xl0<sup>-6</sup> nm(W/Hz)<sup>1/2</sup>.

© 2001 Optical Society of America

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