Polarization aberration analysis of the Advanced X-ray Astrophysics Facility Telescope assembly

Details Polarization aberration analysis of the Advanced X-ray Astrophysics Facility Telescope assembly Polarization aberration analysis of the Advanced X-ray Astrophysics Facility Telescope assembly

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apopt..31.2301c&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 31, no. 13, May 1, 1992, p. 2301-2313. Research supported by NASA.

Astronomy and Astrophysics

Astrophysics

5

Aberration, Polarized Light, Telescopes, X Ray Astrophysics Facility, Grazing Incidence, Image Processing, Linear Polarization, Paraboloid Mirrors, Refractivity

Scientific paper

The Advanced X-ray Astrophysics Facility (AXAF) Telescope consists of six concentric paraboloid-hyperboloid pairs of mirrors that operate near grazing incidence. Because of the substantial polarization effects at large angles of incidence there has been concern regarding the feasibility of doing polarimetry near the telescope focal plane. The primary mirror is here shown to act as a tangentially directed half-wave linear retarder and almost completely to depolarize the linearly polarized component of the light. The secondary mirror introduces and additional half-wave of linear retardance. The two-mirror telescope assembly acts as a tangentially directed one-wave linear retarder. Each mirror depolarizes alone but together the two-mirror assembly preserves the polarization state. The net instrumental polarization effects are small and polarimetry is feasible with AXAF.

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