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Ellipsometry of coelostat coatings using a Babinet compensator: Simulation of the experimental accuracy

✍ Scribed by K. Sankarasubramanian; P. Venkatakrishnan

Publisher: Springer
Year: 1996
Tongue: English
Weight: 387 KB
Volume: 167
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00146324

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✦ Synopsis

The precise measurement of solar magnetic fields requires an accurate measurement of the Muller matrix of the optical components in the path of the light beam, which again requires a careful measurement of the optical constants of the reflecting surfaces in the case of a 3-mirror coelostat system. Here we present a method to measure the optical constants (the real and imaginary part of the refractive index) to an accuracy of the order of 1% for bulk aluminium. This work is directed towards the measurement of instrumental polarisation at the Kodaikanal solar tower telescope, although it can be used for any metallic coated optics.

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