We describe a dispersion-free high-speed scanning optical delay line that is suitable for real-time optical coherence tomography, in particular, when an ultrabroadband light source is used. The delay line is based on all-reflective optics consisting of two flat and one curved mirrors. We achieve optical path-length scanning by oscillating one of the two flat mirrors with a resonant galvanometer. The delay line is compact and easy to implement. A total scanning depth of 1.50 mm with an 89% duty ratio, a maximal scanning speed of ∼9.1 m/s, and a 4.1-kHz repetition rate has been demonstrated.
© 2004 Optical Society of America
(120.5800) Instrumentation, measurement, and metrology : Scanners
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.4500) Medical optics and biotechnology : Optical coherence tomography
Xiumei Liu, Michael J. Cobb, and Xingde Li, "Rapid scanning all-reflective optical delay line for real-time optical coherence tomography," Opt. Lett. 29, 80-82 (2004)