Journal
PHOTONICS
Volume 9, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/photonics9010037
Keywords
fibre endoscopy; spatial light modulator; transmission matrix
Categories
Funding
- Ministry of Education, Youth, and Sports of the Czech Republic [CZ.02.1.01/0.0/0.0/15_003/0000476, LO1212]
- Czech Academy of Sciences [RVO:68081731]
- European Commission [CZ.1.05/2.1.00/01.0017]
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This paper demonstrates that combining a relatively small number of transmission matrices (TMs), measured using different internal references, can completely eliminate blind spots in multimode fiber-based endoscopic imaging, resulting in a significant enhancement of imaging quality.
The interferometric acquisition of the transmission matrix (TM) of a multimode optical fibre (MMF), which is at the heart of multimode fibre-based endoscopic imaging methods, requires using a reference beam. Attempts to use an internal reference, that is to provide the reference in a common pathway geometry through the MMF itself, lead to a speckled reference intensity and consequential occurrence of blind spots-locations where insufficient optical power in the reference wave inflicts strong measurement errors. Here we show that combining a relatively small number of TMs, which are measured using different internal references, facilitates a complete elimination of blind spots, and thereby a significant enhancement of the imaging quality.
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