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13 March 2024 Diffractive micro-lens light-shaping for fiber imaging probes with versatile depth-of-field imaging
Fei He, Rafael Fuentes-Dominguez, Richard Cousins, Christopher Mellor, Jennifer K. Barton, George Gordon
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Proceedings Volume PC12835, Optical Fibers and Sensors for Medical Diagnostics, Treatment, and Environmental Applications XXIV; PC1283502 (2024) https://doi.org/10.1117/12.3000967
Event: SPIE BiOS, 2024, San Francisco, California, United States
Abstract
Hair-thin optical fiber endoscopes have opened new paradigms for advanced imaging applications, such as optical coherence tomography, which a large depth-of-field is desirable to trade off lateral and axial resolutions. This requirement can be achieved using needle-like Bessel beams, generated by micro-lenses bonded onto fiber tips. In this paper, we compare Fresnel zone plate and axicon mask on fiber tips shaping light into Gaussian foci and Bessel beams, and demonstrate that the axicon-fiber device is capable of imaging a resolution target with large depth-of-field. We also show that our fabrication method is capable of fabricating fiber-imaging devices with multi-layer lens stacks.
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Fei He, Rafael Fuentes-Dominguez, Richard Cousins, Christopher Mellor, Jennifer K. Barton, and George Gordon "Diffractive micro-lens light-shaping for fiber imaging probes with versatile depth-of-field imaging", Proc. SPIE PC12835, Optical Fibers and Sensors for Medical Diagnostics, Treatment, and Environmental Applications XXIV, PC1283502 (13 March 2024); https://doi.org/10.1117/12.3000967
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KEYWORDS
Biological imaging
Depth of field
Endoscopes
Optical fibers
Optics manufacturing
Optical coherence tomography
Chromium
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