Appl Opt. 2021 Aug 1;60(22):6385-6392. doi: 10.1364/AO.431010.
Endoscopic optical coherence tomography of large airways poses unique challenges. A hybrid lens is described that consists of a section of coreless fiber and graded index fiber (GIF), followed by a ball lens section. This design produces low numerical aperture beams better suited for large airway imaging. The performance of this lens is compared against conventional GIF and ball lens designs. Forward- and side-viewing probes were modeled, fabricated, and tested. The impact of a sheath on the beam profile was also investigated. Probes with working distances larger than 10 mm and depth-of-focus exceeding 12 mm are demonstrated with the proposed design.
大气道内镜光学相干断层成像技术具有独特的挑战。本文描述了一种混合透镜，由无芯光纤和梯度折射率光纤（GIF）段以及球透镜段组成。这种设计产生的低数值孔径光束更适合大气道成像。该透镜的性能与传统的 GIF 和球透镜设计进行了比较。对前向和侧向观察探头进行了建模、制作和测试。还研究了护套对光束轮廓的影响。所提出的设计实现了工作距离大于 10mm 和景深超过 12mm 的探头。
