Radial Polarizing Phase Shifting Interferometry with
applications to single shot n-interferograms
measurements and potential usage for white light
interferograms analysis
Posted on 2020-03-26 - 21:42
In this research, we present an interferometric system to analyze transparent samples using interferograms
generated by a phase-shifting radial shear grating-interferometer for two cases: the first obtaining n- simultaneous
phase shifting interferograms using a coherent light source and the second one using sequential phase-steps with a
white light source. For the first case the simultaneous interferograms are generated using two optical systems: the
first one generates the polarized pattern while the second one, consisting of a 4f system creating replicas of the
output interferograms. By using a 2D sinusoidal phase grating, we have the advantage of obtaining up to 9
replicated interferograms, all of them with comparable intensities and having amplitudes modulated by the 2D
sinusoidal phase grating diffraction orders as zero-order Bessel´s functions. To obtain the optical phase map,
several phase shifts are generated by placing a polarizing filter covering each replicated interferogram. We
highlight the advantage of using n-simultaneous interferograms by comparing resulting optical phases processed
by a conventional four-step algorithm against those obtained by an implemented n=N+1 method, reducing errors
with noisy interferograms. Results for n=7 and n=9 cases are presented. In addition, we have tested the setup with
white light interference techniques by employing the polarizer radial shearing interferometer, for this case the
optical phase is calculated with the four and the three steps algorithms. Results of testing the developed system to
examine static and dynamic phase objects are also included.
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Toto-Arellano, Noel-Ivan (2020). Radial Polarizing Phase Shifting Interferometry with
applications to single shot n-interferograms
measurements and potential usage for white light
interferograms analysis. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4814157.v1
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