Calculated Ellipsometry of the VLTI AT mirror train

Details Calculated Ellipsometry of the VLTI AT mirror train Calculated Ellipsometry of the VLTI AT mirror train

2010-06-21

arxiv.org/abs/1006.4145v2

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

Calculation extended to 31 reflections

Scientific paper

The polarization effect of the 31 reflections within the mirror train of an auxiliary telescope of the Very Large Telescope Interferometer is calculated as a function of pointing direction and rotator angle. With a rough estimate of the mean complex index of refraction of the reflecting surfaces, their Jones matrices are concatenated while tracing a ray from M1 up to the feeding mirror in front of an instrument. The net effect is summarized in terms of the axis ratio of the polarization ellipse of star light that was circularly polarized above the primary mirror.

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