Abstract
Endoscopic optical coherence tomography (OCT) has many promising applications in the fields of medical research and clinical diagnosis. In this letter, we present a side-viewing endoscopic OCT probe based on a gradient index (GRIN) lens with an air gap. By adjusting the length of the air gap the optical performance of the probe can be flexibly tuned. The quantitative relationships between the optical performance parameters of the probe and its structural parameters are theoretically analyzed by using the ABCD beam transfer matrix theory. The developed probe has a maximum diameter of 1.4 mm and a rigid length of 11 mm. The working distance and the spot size of the probe are measured to be 2.71 mm and 21.24 μm respectively. An endoscopic swept source OCT (SS-OCT) imaging system with an adjustable axial scan rate is built which can flexibly match the rotational scanning speed of the probe. The circumferential OCT images of the tape and the biological tissue are acquired and reconstructed.
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