Simultaneous formation of four fringes by using a polarization quadrature phase-shifting interferometer with wave plates and a diffraction grating
- 9 September 2008
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 47 (26), 4787-4792
- https://doi.org/10.1364/ao.47.004787
Abstract
We present a new type of quadrature phase-shifting interferometer, which utilizes wave plates, a diffraction grating, and two lasers with different wavelengths, in order to acquire two sets of two quadrature fringe patterns in each wavelength formed on a single image sensor. This method for calculating with four phase-shifted fringe patterns gives us the phase sum and difference distributions between the phases in two wavelengths. This is also substantiated by results of our experiments.Keywords
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