23 September 2016 Liquid crystals for optical modulation and sensing applications
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Abstract
Photo-addressed liquid crystal media allow realizing optical phase detection based on self-adaptive holographic processes. Examples are reported of adaptive holographic systems based on optically addressed liquid crystal spatial light modulators. Owing to the physical mechanisms involved, such liquid crystal based adaptive interferometers adapt to slow phase variations, thus filtering out low frequency noise while transmitting the phase modulations at higher frequencies. This method permits measuring small phase modulations in noisy environments and with distorted and speckled wavefronts. The basic principles of the adaptive interferometer are presented, then, the association with an optical fiber is shown to realize a new class of distributed optical fiber sensors.
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S. Residori, U. Bortolozzo, A. Peigné, S. Molin, P. Nouchi, D. Dolfi, J. P. Huignard, "Liquid crystals for optical modulation and sensing applications", Proc. SPIE 9940, Liquid Crystals XX, 99400N (23 September 2016); doi: 10.1117/12.2237579; https://doi.org/10.1117/12.2237579
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