Video-rate centimeter-range optical coherence tomography based on dual optical frequency combs by electro-optic modulators
Abstract
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 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 depth is proved by using 10 pieces of 1-mm thick 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 158 µm. Dual optical frequency combs provide a promising solution to relax the detection bandwidth requirement in fast long-range OCT systems.
Additional Information
© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Received 27 Jun 2018; revised 24 Aug 2018; accepted 27 Aug 2018; published 10 Sep 2018. Funding: This work was partially supported by the grants from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project Nos. HKU 17205215; CityU T42-103/16-N; and E-HKU701/17) and National Natural Science Foundation of China (N_HKU712/16); GD-HK Technology Cooperation Funding Scheme (GHP/050/14GD).Attached Files
Published - oe-26-19-24928.pdf
Supplemental Material - Visualization_1-imaging_with_10_glass_slides.mp4
Supplemental Material - Visualization_2-inserting_and_removing_a_glass_slide.mp4
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Additional details
- Eprint ID
- 90150
- Resolver ID
- CaltechAUTHORS:20181008-102358222
- HKU 17205215
- Research Grants Council of Hong Kong
- CityU T42-103/16-N
- Research Grants Council of Hong Kong
- E-HKU701/17
- Research Grants Council of Hong Kong
- N_HKU712/16
- National Natural Science Foundation of China
- GHP/050/14GD
- National Natural Science Foundation of China
- Created
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2018-10-08Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field