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Proceedings Paper

Two-wave mixing and slow-light effects in liquid crystal light-valves
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Paper Abstract

Two-wave mixing experiments performed in a liquid crystal light-valve leads to optical amplification in the Raman-Nath regime of diffraction. By exploiting the dispersion properties associated with the two-wave mixing gain, we demonstrate slow and fast light effects, with the output signal pulse either delayed or anticipated with respect to the input light field. Group velocity as slow as a 0.2 mm/s are obtained, and a large tunability of the group delay is achieved thanks to the ability of controlling the liquid crystal nonlinear response through the main experimental parameters. A theoretical model based on the Kerr-like response of the liquid crystal light-valve accounts for the experimental results and allows us to calculate the group delays for the different output orders. We show that the large group delay obtained in the slow light regime can be exploited to enhance the spectral sensitivity of a Mach-Zehnder interferometer and, on the other side, the narrow frequency bandwidth of the two-wave mixing gain can be used to realize an adaptive holographic system that achieves picometer detection.

Paper Details

Date Published: 21 August 2009
PDF: 14 pages
Proc. SPIE 7414, Liquid Crystals XIII, 74140R (21 August 2009); doi: 10.1117/12.827870
Show Author Affiliations
Stefania Residori, Institut Non Linéaire, CNRS, Univ. de Nice Sophia Antipolis (France)
Umberto Bortolozzo, Univ. of Verona (Italy)
Jean-Pierre Huignard, Thales Research & Technology (France)


Published in SPIE Proceedings Vol. 7414:
Liquid Crystals XIII
Iam Choon Khoo, Editor(s)

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