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

@article{Iwai2004QuantitativePI,
  title={Quantitative phase imaging using actively stabilized phase-shifting low-coherence interferometry.},
  author={Hidenao Iwai and Christopher Fang-Yen and Gabriel Popescu and Adam Wax and Kamran Badizadegan and Ramachandra R. Dasari and M. S. Feld},
  journal={Optics letters},
  year={2004},
  volume={29 20},
  pages={
          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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