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Proceedings Paper

Achromatic liquid crystal polarization modulator
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Paper Abstract

The design of an achromatic polarisation modulator is presented. The modulator is based on a combination of three electrically switchable non-achromatic ferroelectric liquid crystal retarders. The design follows the idea by Pancharatnam who first introduced suitable achromatic combinations of crystal retarders. We combined three ferroelectric liquid crystal retarders to create an electrically switchable achromatic halfwave plate which can be used in the spectral range from 400 nm to 750 nm. Different designs are theoretically modeled and compared under the aspects of their individual response to temperature fluctuations and useful wavelength range. First results of laboratory tests are presented to experimentally evaluate the feasibility of the concept.

Paper Details

Date Published: 14 February 2003
PDF: 10 pages
Proc. SPIE 4843, Polarimetry in Astronomy, (14 February 2003); doi: 10.1117/12.458835
Show Author Affiliations
Daniel Gisler, Institut fuer Astronomie, ETH Zentrum (Switzerland)
Alex Feller, Institut fuer Astronomie, ETH Zentrum (Switzerland)
Achim M. Gandorfer, Institut fuer Astronomie, ETH Zentrum (Switzerland)

Published in SPIE Proceedings Vol. 4843:
Polarimetry in Astronomy
Silvano Fineschi, Editor(s)

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