White-light Phase-stepping Interferometry for Surface Profiling |
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Authors: | P Hariharan Maitreyee Roy |
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Affiliation: | Physical Optics Department, School of Physics , University of Sydney , New South Wales, 2006, Australia |
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Abstract: | Abstract Interferometric profilers suffer from phase ambiguities if the measurement range involves a change in the optical path difference greater than a wavelength. This limitation has been overcome by using white light and scanning the object in height. We show how an achromatic phase shifter operating on the geometric phase can be used to evaluate the fringe contrast directly and to locate the position of the zero-order white-light fringe along the scanning axis. |
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