Extended depth of field imaging through multicore optical fibers

Orth, A, Plöschner, M, Maksymov, I and Gibson, B 2018, 'Extended depth of field imaging through multicore optical fibers', Optics Express, vol. 26, no. 5, pp. 6407-6419.

Document type: Journal Article
Collection: Journal Articles

Title Extended depth of field imaging through multicore optical fibers
Author(s) Orth, A
Plöschner, M
Maksymov, I
Gibson, B
Year 2018
Journal name Optics Express
Volume number 26
Issue number 5
Start page 6407
End page 6419
Total pages 13
Publisher Optical Society of America
Abstract Compact microendoscopes use multicore optical fibers (MOFs) to visualize hard-to-reach regions of the body. These devices typically have a large numerical aperture (NA) and are fixed-focus, leading to blurry images from a shallow depth of field with little focus control. In this work, we demonstrate a method to digitally adjust the collection aperture and therefore extend the depth of field of lensless MOF imaging probes. We show that the depth of field can be more than doubled for certain spatial frequencies, and observe a resolution enhancement of up to 78% at a distance of 50?m from the MOF facet. Our technique enables imaging of complex 3D objects at a comparable working distance to lensed MOFs, but without the requirement of lenses, scan units or transmission matrix calibration. Our approach is implemented in post processing and may be used to improve contrast in any microendoscopic probe utilizing a MOF and incoherent light. © 2018 Optical Society of America.
Subject Condensed Matter Imaging
Keyword(s) Light-Field
Microlens Arrays
Multimode Fibers
DOI - identifier 10.1364/OE.26.006407
Copyright notice © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
ISSN 1094-4087
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