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Implementation and comparative evaluation of various architectures of ultrasonic photorefractive sensors

Abstract : A novel optical sensor for the detection of ultrasonic motion has been recently developed. It allows to reach 25 μm displacement sensitivity with a large frequency range bandwidth 100 MHz. We will present a comparative study between various architectures of this ultrasonic detection system we have implemented. It uses InP:Fe or CdZnTe:V holographic crystals and operates with CW laser at 1.06 μm. Two configurations called the direct detection and the anisotropic diffraction configurations work with either plane or speckled waves. A third discussed configuration works with depolarized speckled waves. We measured their relative detection limits as a function of the applied electric field that governs photorefractive efficiency of the materials. Experimental results are well described by theory, using photorefractive models relevant to the used crystals
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Sébastien de Rossi, Philippe Delaye, Jean-Claude Launay, Gérald Roosen. Implementation and comparative evaluation of various architectures of ultrasonic photorefractive sensors. Optical Materials, Elsevier, 2001, 18, pp.45-48. ⟨10.1016/S0925-3467(01)00128-8⟩. ⟨hal-00674640v2⟩

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