Ding Zhihua, Qiu Jianrong, Shen Yi, Chen Zhiyan, Bao Wen
Opt Lett. 2017 Jul 15;42(14):2814-2817. doi: 10.1364/OL.42.002814.
A high-efficiency lensless all-fiber probe for optical coherence tomography (OCT) is presented. The probe is composed of a segment of large-core multimode fiber (MMF), a segment of tapered MMF, and a length of single-mode fiber (SMF). A controllable output beam can be designed by a simple adjustment of its probe structure parameters (PSPs), instead of the selection of fibers with different optical parameters. A side-view probe with a diameter of 340 μm and a rigid length of 6.37 mm was fabricated, which provides an effective imaging range of ∼0.6 mm with a full width at half-maximum beam diameter of less than 30 μm. The insertion loss of the probe was measured to be 0.81 dB, ensuring a high sensitivity of 102.25 dB. Satisfactory images were obtained by the probe-based OCT system, demonstrating the feasibility of the probe for endoscopic OCT applications.
本文提出了一种用于光学相干断层扫描（OCT）的高效无透镜全光纤探头。该探头由一段大芯多模光纤（MMF）、一段锥形多模光纤和一段单模光纤（SMF）组成。通过简单调整其探头结构参数（PSP）即可设计出可控输出光束，而无需选择具有不同光学参数的光纤。制作了一个直径为340μm、刚性长度为6.37mm的侧视探头，其有效成像范围约为0.6mm，半高宽光束直径小于30μm。测得该探头的插入损耗为0.81dB，确保了102.25dB的高灵敏度。基于该探头的OCT系统获得了令人满意的图像，证明了该探头用于内窥式OCT应用的可行性。
