title: Extended field-of-view in a lensless endoscope using an aperiodic multicore fiber.
abstract: We investigate lensless endoscopy using coherent beam combining and aperiodic multicore fibers (MCF). We show that diffracted orders, inherent to MCF with periodically arranged cores, dramatically reduce the field-of-view (FoV), and that randomness in MCF core positions can increase the FoV up to the diffraction limit set by a single fiber core, while maintaining a MCF experimental feasibility. We demonstrate experimentally pixelation-free lensless endoscopy imaging over a 120 μm FoV with an aperiodic MCF designed with widely spaced cores. We show that this system is suitable to perform beam scanning imaging by simply applying a tilt to the proximal wavefront.
authors.forename: Siddharth
authors.initials: S
authors.lastname: Sivankutty
authors.forename: Viktor
authors.initials: V
authors.lastname: Tsvirkun
authors.forename: Géraud
authors.initials: G
authors.lastname: Bouwmans
authors.forename: Dani
authors.initials: D
authors.lastname: Kogan
authors.forename: Dan
authors.initials: D
authors.lastname: Oron
authors.forename: Esben Ravn
authors.initials: ER
authors.lastname: Andresen
authors.forename: Hervé
authors.initials: H
authors.lastname: Rigneault