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Proceedings Paper

LC cell response time improvement for polarization control application
Author(s): Sylvie Le Bras; Michel Lehaitre
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Paper Abstract

Liquid crystals (LC) have been known for more than a century. These materials different from both liquids and solids have a molecular disposition intermediate between chaos and perfect order. Their anisotropic optical properties were quickly revealed but without special applications. Tothy LC are in every day life and their applications are more and more numerous. To respond to users'' needs new products are continuously appearing on the market and many improvements have been made. In this paper we will introduce a technique which allows the improvement of a variable retarder LC cell response time. The switching speed between two retardation states is of primary importance for many applications (polarimeters variable attenuators shutters. . . ). In our particular case this improvement was proved essential in order to make the cell compatible with an underwater polarimetric imaging application. The cell is here used as a variable retarder and switching between two retardation states must occur between two successive expositions. By modifying the electric field control which tunes the retardance of the cell the switching speed can be improved.

Paper Details

Date Published: 15 June 1992
PDF: 8 pages
Proc. SPIE 1665, Liquid Crystal Materials, Devices, and Applications, (15 June 1992); doi: 10.1117/12.60401
Show Author Affiliations
Sylvie Le Bras, Ifremer (France)
Michel Lehaitre, Ifremer (France)

Published in SPIE Proceedings Vol. 1665:
Liquid Crystal Materials, Devices, and Applications
Paul S. Drzaic; Uzi Efron, Editor(s)

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