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.
© 2004 Optical Society of America
Hidenao Iwai, Christopher Fang-Yen, Gabriel Popescu, Adam Wax, Kamran Badizadegan, Ramachandra R. Dasari, and Michael S. Feld, "Quantitative phase imaging using actively stabilized phase-shifting low-coherence interferometry," Opt. Lett. 29, 2399-2401 (2004)