1. Ultra-thin and flexible endoscopy probe for optical coherence tomography based on stepwise transitional core fiber

    Ultra-thin and flexible endoscopy probe for optical coherence tomography based on stepwise transitional core fiber

    We present an ultra-thin fiber-body endoscopy probe for optical coherence tomography (OCT) which is based on a stepwise transitional core (STC) fiber. In a minimalistic design, our probe was made of spliced specialty fibers that could be directly used for beam probing optics without using a lens. In our probe, the OCT light delivered through a single-mode fiber was efficiently expanded to a large mode field of 24 μm diameter for a low beam divergence. The size of our probe was 85 μm in the probe’s diameter while operated in a 160-μm thick protective tubing. Through theoretical and ...

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