Abstract
We report a dual-focus fiber-optic probe designed to extend depth of focus (DOF) in high-resolution endoscopic optical coherence tomography. We exploited the broad spectral bandwidth of a supercontinuum source and, in the fiber probe, the foci of the 750–1000 nm and 1100–1450 nm inputs were axially chromatically shifted. The interference signals from the two spectral bands were measured with a Si camera-based spectrometer and an InGaAs camera-based spectrometer, respectively. We verified the feasibility of the design using a phantom composed of microparticles and swine small intestine tissue ex vivo. The results showed that a transverse resolution below 5 μm over 300 μm could be maintained, and that the extended DOF was 2 times larger than that of the single focus probe via the use of dual spectral band inputs and a chromatic focal shift.
© 2018 Optical Society of America
Full Article | PDF ArticleMore Like This
Wei Wang, Guangying Wang, Jun Ma, Linghao Cheng, and Bai-Ou Guan
Opt. Express 27(2) 358-366 (2019)
En Bo, Yuemei Luo, Si Chen, Xinyu Liu, Nanshuo Wang, Xin Ge, Xianghong Wang, Shufen Chen, Shi Chen, Jinhan Li, and Linbo Liu
Optica 4(7) 701-706 (2017)
En Bo, Xin Ge, Xiaojun Yu, Jianhua Mo, and Linbo Liu
Appl. Opt. 57(13) 3556-3560 (2018)