Fig. 1.

Schematic illustration of swept source optical coherence tomography (SS-OCT) system.

Near-infrared laser is emitted and divided into a signal and a reference beam. Reference light and backscattered light from the sample are recombined by a second fiber coupler to create an interferogram over time. Fringe responses are detected with a balanced detector, converted to electrical signals, and digitized by an analog-to-digital converter (A/D) board.