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Velocity measurements with structured light transmitted through a multimode optical fiber using digital optical phase
Optics Express
|April 1, 2020
Summary
This study demonstrates lensless fiber microendoscopy using digital optical phase conjugation to generate localized fringe systems for quantitative metrology. This technique enables non-invasive flow measurements without imaging lenses, advancing biomedical and technical applications.
Area of Science:
- Optics
- Biomedical Engineering
- Fluid Dynamics
Background:
- Lensless fiber microendoscopes offer minimally invasive optical diagnostics and therapy.
- Multimode fibers are suitable due to small diameters, but mode scrambling limits structured light transmission.
Purpose of the Study:
- To generate a localized fringe system at variable distances from a fiber end.
- To utilize this system for quantitative metrology, specifically microchannel flow velocity measurements.
- To demonstrate lensless operation for enhanced biomedical imaging and technical inspection.
Main Methods:
- Exploiting digital optical phase conjugation (DOPC).
- Generating a replayed fringe system at the distal fiber end.
- Performing quantitative metrology without imaging lenses.
Main Results:
- Successfully generated a localized fringe system at variable distances.
- Achieved quantitative velocity measurements of microchannel flow.
- Demonstrated lensless operation in close proximity to the fiber end.
Conclusions:
- Digital optical phase conjugation enables lensless, quantitative metrology with multimode fibers.
- This approach overcomes mode scrambling limitations for structured light transmission.
- Lensless fiber systems hold significant potential for biomedical imaging, stimulation, and technical inspection.
