LC cell response time improvement for polarization control           application

Sylvie Le Bras; Michel Lehaitre

doi:10.1117/12.60401

15 June 1992 LC cell response time improvement for polarization control application

Sylvie Le Bras, Michel Lehaitre

Proceedings Volume 1665, Liquid Crystal Materials, Devices, and Applications; (1992) https://doi.org/10.1117/12.60401
Event: SPIE/IS&T 1992 Symposium on Electronic Imaging: Science and Technology, 1992, San Jose, CA, United States

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.

Citation Download Citation

Sylvie Le Bras and Michel Lehaitre "LC cell response time improvement for polarization control application", Proc. SPIE 1665, Liquid Crystal Materials, Devices, and Applications, (15 June 1992); https://doi.org/10.1117/12.60401

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KEYWORDS

Liquid crystals

Switching

Wave plates

Polarization

Cameras

Polarization control

Manufacturing

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