18 February 2008 All-fiber probe for optical coherence tomography
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We propose an all-fiber probe for the sample arm of an optical coherence tomography (OCT) system. By forming a focusing lens directly on the tip of an optical fiber, a compact sample probe could be implemented. To achieve a long enough working distance and a high enough lateral resolution at the same time, a coreless silica fiber (CSF) having a diameter larger than that of a conventional single mode fiber was utilized. With the specially fabricated CSF having a diameter of 180 μm, a fiber-lens having a 120 μm radius of curvature could be made, which allowed the sample probe having a working distance as long as 920 μm and a lateral resolution as high as 9.4 μm. To present the performance of the OCT system equipped with the proposed sample probe, the OCT images of a rat finger skin and a pearl were taken. The system could image as deep as 1.0 mm of the rat finger skin and 3.5 mm of the pearl, and the images are compared with the ones taken by using a conventional objective lens (10x, NA0.25). Owing to the small form factor of the proposed probe, it can find good applications in the field of optical imaging based on endoscope or catheter.
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Seon Young Ryu, Seon Young Ryu, Hae Young Choi, Hae Young Choi, Jihoon Na, Jihoon Na, Woo June Choi, Woo June Choi, Byeong Ha Lee, Byeong Ha Lee, } "All-fiber probe for optical coherence tomography", Proc. SPIE 6847, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XII, 68472L (18 February 2008); doi: 10.1117/12.766316; https://doi.org/10.1117/12.766316

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