22 September 1997 Photorefractive detection of ultrasound
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Abstract
We present and describe different techniques based on the photorefractive effect that are used for the optical detection of ultrasonic signals. These techniques use the wavefront adaptation properties of the photorefractive effect. They are: the photorefractive beam combiner, the double phase conjugate heterodyne detection and the adaptive photodetector based on non steady state photoelectromotive force. Their respective advantages and drawbacks, are overviewed. We insist on the latest development and performances obtained with the photorefractive beam combiner that seems to use the most promising technique for the detection of ultrasonic signals on rough surfaces. We show that a sensor with near optimum sensitivity can be developed with the same photorefractive crystal at different wavelength in the range of 1 micrometer to 1.55 micrometer.
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Philippe Delaye, Alain Blouin, Louis-Anne de Montmorillon, Denis Drolet, Jean-Pierre Monchalin, Gerald Roosen, "Photorefractive detection of ultrasound", Proc. SPIE 3137, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications III, (22 September 1997); doi: 10.1117/12.287778; https://doi.org/10.1117/12.287778
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