Fringes in polarizing optical elements.

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

A Muller Matrix description is developed for expressing the effects of spectral fringes (channel spectra) arising from polarizing optical elements in astronomical polarimeters. This description allows one to derive the effects of fringes in a straightforward manner. The formalism is applied to the case of the rotating linear retarder that will be used in the Advanced Stokes Polarimeter (ASP). It is shown that, through proper calibration of the ASP polarimeter on a pixel-by-pixel basis, the effects of spectral fringing should not be troublesome, but these effects may be more troublesome in polarimeters which demand higher polarization accuracy.

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