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Photorefractive multiple quantum well device at 1064 nm and its application to adaptive vibration measurement

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Abstract

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−1 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 1.5×l0−6 nm(W/Hz)1/2.

© 2001 Optical Society of America

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