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Title: Extending the depth of focus of fiber-optic optical coherence tomography using a chromatic dual-focus design
Authors: Li, Jinhan
Luo, Yuemei
Wang, Xianghong
Wang, Nanshuo
Bo, En
Chen, Si
Chen, Shufen
Chen, Shi
Tsai, Meng-Tsan
Liu, Linbo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Li, J., Luo, Y., Wang, X., Wang, N., Bo, E., Chen, S., . . . Liu, L. (2018). Extending the depth of focus of fiber-optic optical coherence tomography using a chromatic dual-focus design. Applied optics, 57(21), 6040-6046. doi:10.1364/AO.57.006040
Journal: Applied Optics
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.
ISSN: 0003-6935
DOI: 10.1364/AO.57.006040
Rights: © 2018 Optical Society of America. All rights reserved. This paper was published in Applied Optics and is made available with permission of Optical Society of America.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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