Velocity measurements with structured light transmitted through a multimode optical fiber using digital optical phase conjugation

PLUTO / PLUTO-2 Spatial Light Modulators
Microscopy Misc.: Speckle / Characterization / Metrology
Published on:
Authors: Lars Büttner and Martin Thümmler and Jürgen Czarske
Abstract:

“Lensless fiber microendoscopes enable optical diagnostics and therapy with minimal invasiveness. Because of their small diameters, multimode fibers are ideal candidates, but mode scrambling hinders the transmission of structured light fields. We present the generation of a localized fringe system at variable distances from the distal fiber end by exploiting digital optical phase conjugation. The replayed fringe system was used for quantitative metrology. Velocity measurements of a microchannel flow in the immediate proximity of the fiber end without the use of any imaging lenses are shown. Lensless multimode fiber systems are of interest especially for biomedical imaging and stimulation as well as technical inspection and flow measurements. “

Open Access

Publication: Optics Express
Issue/Year: Vol. 28, Issue 6, pp. 8064-8075
DOI: 10.1364/OE.386047
Link: https://doi.org/10.1364/OE.386047

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