School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea.
Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea.
Sensors (Basel). 2018 Nov 27;18(12):4150. doi: 10.3390/s18124150.
A method for adjusting the working distance and spot size of a fiber probe while suppressing or enhancing the back-coupling to the lead-in fiber is presented. As the optical fiber probe, a lensed optical fiber (LOF) was made by splicing a short piece of coreless silica fiber (CSF) on a single-mode fiber and forming a lens at the end of the CSF. By controlling the length of the CSF and the radius of lens curvature, the optical properties of the LOF were adjusted. The evolution of the beam in the LOF was analyzed by using the Gaussian ABCD matrix method. To confirm the idea experimentally, 17 LOF samples were fabricated and analyzed theoretically and also experimentally. The results show that it is feasible in designing the LOF to be more suitable for specific or dedicated applications. Applications in physical sensing and biomedical imaging fields are expected.
提出了一种在抑制或增强向引入光纤的反向耦合的同时调整光纤探头的工作距离和光斑大小的方法。作为光纤探头，通过在单模光纤上拼接一小段无芯石英光纤（CSF）并在 CSF 的末端形成透镜，制造了透镜光纤（LOF）。通过控制 CSF 的长度和透镜曲率半径，可以调整 LOF 的光学性能。使用高斯 ABCD 矩阵方法分析了 LOF 中的光束演化。为了通过实验证实这一想法，制作了 17 个 LOF 样品，并进行了理论和实验分析。结果表明，在设计更适合特定或专用应用的 LOF 方面是可行的。预计将在物理传感和生物医学成像领域得到应用。
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