On the use of Bowen compensators for polarimetry.

Details On the use of Bowen compensators for polarimetry. On the use of Bowen compensators for polarimetry.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..119..171k&link_type=abstract

Astronomy and Astrophysics Supplement, v.119, p.171-176

Astronomy and Astrophysics

Astrophysics

7

Instrumentation: Polarimeters, Techniques: Polarimetric

Scientific paper

For high precision polarimetry it is very desirable to observe with a telescope that is free of instrumental polarization. Yet it is often inevitable to introduce optical devices which generate crosstalk between the Stokes Q,U components and the V component due to phase retardations upon reflection at mirror surfaces. We show that Bowen compensators are well suited to compensate for these phase changes. They consist of 2 rotatable λ/8 phase retarder plates, and it can be shown that they act on polarized light either by a rotation of the axes of the polarization ellipse followed by a prescribed, desired phase change or by a phase change followed by rotation of the ellipse. We present applications of Bowen compensators in the Gregory Coude Telescope at the Observatorio del Teide/Tenerife.

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