Abstract
An all-fiber probe is proposed to meet the requirements of small size and strong light-collection capability for optical coherence tomography (OCT) probes for in vivo human detection. It consists of a single-mode fiber, a coreless fiber and a gradient refractive index (GRIN) fiber. The coreless fiber is fused into a spherical shape to focus the beam and the GRIN fiber is added to the microsphere probe to optimise the resolution. The optical transmission model of the probe is developed, and then the structural design of the probe is modelled and simulated to determine the optimal parametric structure of the probe. Moreover, apply the probe to the OCT system for the imaging experiments to obtain grey-scale interior images of three- layer of slides, which can verify the feasibility of the probe. The diameter of the probe is 300 μm, which meets the size requirements for in vivo human detection and provides a highly compact, high-resolution option for the field of in vivo detection.
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