Quantitative phase imaging using spectral domain phase microscopy without phase wrapping ambiguity

We demonstrate a method for quantitative phase (QP) imaging without 2π ambiguity using a spectral domain phase microscopy system. The method is capable of QP measurement of a large dynamic range with a high sensitivity. We determine an integer multiple of 2π to correct wrapped phases by calculating the phase shift difference between the detected interference fringe and simulated fringes. The presented method is quantitatively verified by measuring the vibration generated by a piezo linear stage and mapping the surface topography of a slanted mirror. QP imaging of red blood cells is also performed to demonstrate the method's capacity and application in biological imaging.