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Proceedings Paper

Methods for refractive-index homogeneity calculation using Fourier-transform phase-shifting interferometry
Author(s): O. Matoušek; V. Lédl; P. Psota; P. Vojtíšek
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Paper Abstract

Fourier-transform phase-shifting interferometry brings the possibility of a very precise measurement of refractive-index variation in a material. In a four surface cavity six first order interferograms are observed. In the standard way an interference between waves reflected from a front and a rear surface of a sample is used to obtain refractive-index homogeneity. But another three interferograms contain information about inner inhomogeneity and can be used for its calculation as well. In this paper all four calculation methods are presented and compared. The measurements and simulations show, the methods give us globally similar outputs. However due to calculation from different interferograms every result is affected by different undesirable effects. This difference can be used for suppression of the effects and thus to refine the results.

Paper Details

Date Published: 11 November 2016
PDF: 11 pages
Proc. SPIE 10151, Optics and Measurement International Conference 2016, 101510Y (11 November 2016); doi: 10.1117/12.2256991
Show Author Affiliations
O. Matoušek, Technical Univ. of Liberec (Czech Republic)
V. Lédl, Technical Univ. of Liberec (Czech Republic)
P. Psota, Technical Univ. of Liberec (Czech Republic)
P. Vojtíšek, Institute of Plasma Physics of the ASCR, v.v.i. (Czech Republic)

Published in SPIE Proceedings Vol. 10151:
Optics and Measurement International Conference 2016
Jana Kovacicinova, Editor(s)

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