Quantitative phase imaging using actively stabilized phase-shifting low-coherence interferometry

Hidenao Iwai, Christopher Fang-Yen, Gabriel Popescu, Adam Wax, Kamran Badizadegan, Ramachandra R Dasari, Michael S Feld
Optics Letters 2004 October 15, 29 (20): 2399-401
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 reflecting biological samples. We demonstrate phase images from a test structure and living cells.


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