Mr. Marcin Lukasz Szczupak Profile

Marcin Lukasz Szczupak

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Proceedings Article | 14 September 2007 Paper

Extended range interferometry based on wavefront shaping

M. Szczupak, L. Salbut

Proceedings Volume 6671, 66711G (2007) https://doi.org/10.1117/12.735711

KEYWORDS: Optical spheres, Calibration, Wavefronts, Interferometry, Spherical lenses, Light sources, Numerical simulations, Optical testing, Distance measurement, Photonics

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There are many cases when absolute measurements of objects with large height differences or height discontinuity is needed. These measurements can not be covered by classical interferometry since the range of non-ambiguity is limited to half the optical wavelength. Several techniques have been already developed for extending of non-ambiguity range. However most of them is based on multi-wavelength methods which demands expensive light sources and special environment conditions. In this work the new interferometric technique for absolute measurements of large steps discontinuities is proposed. Variable wavefront of the illuminating beam and special procedure for calibration of the measurement volume are used for extending of the measurement range without using multispectral sources. Additionally, calibration of the measurement area simplifies fringe processing and quicken measures. Theoretical analysis of this technique, its numerical simulations and experimental verification are presented and discussed.

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