Self-calibration of lensless holographic endoscope using programmable guide stars

Coherent fiber bundle (CFB)-based endoscopes enable optical keyhole access in applications such as biophotonics. In conjunction with objective lenses, CFBs allow imaging of intensity patterns. In contrast, digital optical phase conjugation enables lensless holographic endoscopes for the generation o...

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Bibliographic Details
Published in:Optics letters 2018-06, Vol.43 (12), p.2997-3000
Main Authors: Kuschmierz, Robert, Scharf, Elias, Koukourakis, Nektarios, Czarske, Jürgen W
Format: Article
Language:English
Subjects:
Calibration
Conjugation
Digital imaging
Endoscopes
Optical transfer function
Phase conjugation
Phase measurement
Self calibration
Transfer functions
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Summary:Coherent fiber bundle (CFB)-based endoscopes enable optical keyhole access in applications such as biophotonics. In conjunction with objective lenses, CFBs allow imaging of intensity patterns. In contrast, digital optical phase conjugation enables lensless holographic endoscopes for the generation of pixelation-free arbitrary light patterns. For real-world applications, however, this requires a non-invasive in situ calibration of the complex optical transfer function of the CFB with only single-sided access. We show that after an initial calibration in a forward direction, a differential phase measurement of the back-reflected light allows for tracking and compensating of bending-induced phase distortions. Furthermore, we present a novel in situ calibration procedure based on a programmable guide star, which requires access to only one side of the fiber.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.43.002997