H. Iwai, C. Fang-Yen, G. Popescu, et al., Quantitative phase imaging using actively stabilized phase shifting low-coherence interferometry, 29, 2399, Opt. Lett. (2004).
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We describe a quantitative phase-imaging interferometer in which phase shifting and noise cancellation are performed by an active feedback loop using a reference laser. Depth gating via low-coherence light allows phase measurement from weakly ref lecting biological samples. We demonstrate phase images from a test structure and living cells.
