Video-rate centimeter-range optical coherence tomography based on dual optical frequency combs by electro-optic modulators

Published on 2018-09-10T17:51:18Z (GMT) by
Imaging speed and range are two important parameters for optical coherence tomography (OCT). A conventional video-rate centimeter-range OCT requires an optical source with hundreds of kHz repetition rate and needs the support of broadband band detectors and electronics (>1 GHz). In this paper, a type of video-rate centimeter-range OCT system is proposed and demonstrated based on dual optical frequency combs by leveraging electro-optic modulators. The repetition rate difference between dual combs, i.e. the A-scan rate of dual-comb OCT, can be adjusted within 0~6 MHz. By down-converting the interference signal from optical domain to radio-frequency domain through dual comb beating, the down-converted bandwidth of the interference signal is less than 22.5 MHz which is at least two orders of magnitude lower than that in conventional OCT systems. A LabVIEW program is developed for video-rate operation, and the centimeter imaging range is proved by using 10 pieces of 1-mm thickness glass stacked as the sample. The effective beating bandwidth between two optical comb sources is 7 nm corresponding to ~108 comb lines, and the axial resolution of the dual-comb OCT is 157.8 µm. Dual optical frequency combs provide a promising solution to relax the detection bandwidth requirement in fast long-range OCT systems.

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Kang, Jiqiang; Feng, Pingping; Li, Bowen; Zhang, Chi; Wei, Xiaoming; Lam, Edmund; et al. (2018): Video-rate centimeter-range optical coherence tomography based on dual optical frequency combs by electro-optic modulators. The Optical Society. Collection.