Ryu Seon Young, Choi Hae Young, Na Jihoon, Choi Woo June, Lee Byeong Ha
Department of Information and Communications, Gwangju Institute of Science and Technology, Gwangju, South Korea.
Appl Opt. 2008 Apr 1;47(10):1510-6. doi: 10.1364/ao.47.001510.
We demonstrate a compact all-fiber sampling probe for an optical coherence tomography (OCT) system. By forming a focusing lens directly on the tip of an optical fiber, a compact sampling probe could be implemented. To simultaneously achieve a sufficiently long working distance and a good lateral resolution, we employed a large-mode area photonic crystal fiber (PCF) and a coreless silica fiber (CSF) of the same diameters. A working distance of up to 1270 microm, a 3 dB distance range of 2210 microm, and a transverse resolution of 14.2 microm were achieved with the implemented PCF lensed fiber; these values are comparable to those obtainable with a conventional objective lens having an NA of 0.25 (10 x). The performance of the OCT system equipped with the proposed PCF lensed fiber is presented by showing the OCT images of a rat finger as a biological sample and a pearl as an in-depth sample.
我们展示了一种用于光学相干断层扫描（OCT）系统的紧凑型全光纤采样探头。通过直接在光纤尖端形成聚焦透镜，可以实现紧凑型采样探头。为了同时实现足够长的工作距离和良好的横向分辨率，我们采用了相同直径的大模面积光子晶体光纤（PCF）和无芯石英光纤（CSF）。所实现的PCF透镜光纤实现了高达1270微米的工作距离、2210微米的3分贝距离范围和14.2微米的横向分辨率；这些值与具有0.25数值孔径（10倍）的传统物镜可获得的值相当。通过展示作为生物样本的大鼠手指和作为深度样本的珍珠的OCT图像，呈现了配备所提出的PCF透镜光纤的OCT系统的性能。
