Quantitative phase imaging using actively stabilized phase-shifting low-coherence interferometry
Journal article published in 2004 by
Hidenao Iwai,
Christopher Fang-Yen 
,
Gabriel Popescu,
Adam Wax ,
Kamran Badizadegan,
Ramachandra R. Dasari,
Michael S. Feld
,
Gabriel Popescu,
Adam Wax ,
Kamran Badizadegan,
Ramachandra R. Dasari,
Michael S. Feld
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Abstract
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.