Microcavity structure based OCT fiber probe with controllable focal length

Chong-ke Ji; Shuai Gao; Qiuyi Ning; Weicheng Chen

doi:10.1117/12.2587410

24 December 2020 Microcavity structure based OCT fiber probe with controllable focal length

Chong-ke Ji, Shuai Gao, Qiuyi Ning, Weicheng Chen

Proceedings Volume 11608, Optics Frontiers Online 2020: Micro and Nanophotonics (OFO-4 2020); 116080C (2020) https://doi.org/10.1117/12.2587410
Event: Optics Frontiers Online 2020: Micro and Nanophotonics (OFO-4 2020), 2020, Online Only

Abstract

Fiber based optical coherence tomography (OCT), which is combined by OCT and fiber probe, presents advantages of high longitudinal resolution, flexibility and miniaturization structure. However, the depth of focus (DOF) and transverse resolution depended on OCT fiber probes are two constraining parameters. The realization of high transverse resolution imaging could result in the reduction in the effective imaging range. To address this issue, a focal length controllable fiber probe based on microcavity structure is proposed in this paper. A segment of alcohol-filled silica capillary is inserted between a single-mode fiber (SMF) and a section of gradient-index (GRIN) fiber and works as a beam expander. By adjusting the surrounding temperature, the expanding condition changes due to the alcohol refractive index is different, eventually the focal length of the probe can be tuned. Experimental results prove that the focal length can be tuned freely from ~1835 μm to ~1650 μm while the temperature of the alcohol is changed from 20°C to 60°C.

Citation Download Citation

Chong-ke Ji, Shuai Gao, Qiuyi Ning, and Weicheng Chen "Microcavity structure based OCT fiber probe with controllable focal length", Proc. SPIE 11608, Optics Frontiers Online 2020: Micro and Nanophotonics (OFO-4 2020), 116080C (24 December 2020); https://doi.org/10.1117/12.2587410

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