7 March 2016 Adaptive holography for optical sensing applications
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Abstract
Adaptive holography is a promising method for high sensitivity phase modulation measurements in the presence of slow perturbations from the environment. The technique is based on the use of a nonlinear recombining medium, here an optically addressed spatial light modulator specifically realized to operate at 1.55 μm. Owing to the physical mechanisms involved, the interferometer adapts to slow phase variations within a range of 5-10 Hz, thus filtering out low frequency noise while transmitting higher frequency phase modulations. We present the basic principles of the adaptive interferometer and show that it can be used in association with a sensing fiber in order to detect phase modulations. Finally, a phase-OTDR architecture using the adaptive holographic interferometer is presented and shown to allows the detection of localized perturbations along the sensing fiber.
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S. Residori, S. Residori, U. Bortolozzo, U. Bortolozzo, A. Peigné, A. Peigné, S. Molin, S. Molin, P. Nouchi, P. Nouchi, D. Dolfi, D. Dolfi, J. P. Huignard, J. P. Huignard, } "Adaptive holography for optical sensing applications", Proc. SPIE 9763, Slow Light, Fast Light, and Opto-Atomic Precision Metrology IX, 97631A (7 March 2016); doi: 10.1117/12.2220218; https://doi.org/10.1117/12.2220218
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