4D profile of phase objects through the use of a simultaneous phase shifting quasi-common path interferometer

Abstract

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Measurement of the slope of transparent micro-structures using two-steps parallel phase shifting interferometry

“…Other advantage of this system is its ability to obtain the derivative of the phase data map in two steps, which can be associated with the partial slope of the phase object [1,7].…”

Measurement of red blood cell characteristic using parallel phase shifting interferometry

“…The 2 ambiguity can be retrieved by means of a phase unwrapping process, so the unwrapped optical phase can be obtained. In order to remove the background phase, the phase retrieval procedure should include a reference phase in step where the background is measured beforehand [9,10]; in other words, the background phase is calculated without the target object.…”

Phase profile analysis of transparent objects through the use of a two windows interferometer based on a one beam splitter configuration

“…These coefficients C n and C l will modulate the intensity pattern obtained at the image plane [2,3].…”

“…The optical arrangement presented is based on principles of polarization phase shifting techniques [1] and grating interferometry [2,3]. A common polarizing optical system uses linear polarizing filters and quarter-wave plates (QWP) to achieve modulation [1], one of the most relevant are the micropolarizers arrays [4] and others authors have proposed an improvements of them using harmonics rejections algorithms or the use of nine shifts [5].…”

“…mirrors M. Quarter wave plates QL (45) and QR (−45) are placed in each one of the beams respectively, to generate a right circular polarizations in A and left circular polarizations in B. This system is simpler than other arrangements previously presented such as Mach Zehnder interferometer [2] or a common path configuration [3] that have been used to generate a double window.…”