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Proceedings Paper

Evaluation of the spatial inhomogeneities of ferrofluid thin plates polarimetric characteristics for active imagery
Author(s): Pierre-Yves Gerligand; Bernard Le Jeune; Jack Cariou; Jean Lotrian
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Paper Abstract

When a static magnetic field, perpendicular to the propagation direction of a laser beam is applied to a magnetic liquid, birefringence and dichroism can be present in this material. These properties have been used to realize an adjustable wave plate for polarimetric modulation applications in active imagery. The first measurements of the linear birefringence have been made by using a continuous laser source and the results have shown the possibility for such a material to realize polarimetric modulation. So we have to obtain a good spatial homogeneity of the polarimetric properties of the retardation plate. This measurement method has been developed in the case of an imagery application using a pulsed laser beam: in this case the temperature effects which could appear in the first set up are removed. Results show the possibility to develop adjustable wave plates based on ferrofluids for which it is possible to make polarimetric modulation at high speed.

Paper Details

Date Published: 14 September 1994
PDF: 11 pages
Proc. SPIE 2265, Polarization Analysis and Measurement II, (14 September 1994); doi: 10.1117/12.186670
Show Author Affiliations
Pierre-Yves Gerligand, Univ. de Bretagne Occidentale (France)
Bernard Le Jeune, Univ. de Bretagne Occidentale (France)
Jack Cariou, Univ. de Bretagne Occidentale (France)
Jean Lotrian, Univ. de Bretagne Occidentale (France)

Published in SPIE Proceedings Vol. 2265:
Polarization Analysis and Measurement II
Dennis H. Goldstein; David B. Chenault, Editor(s)

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