Towards two-photon lensless endoscopes: inter-core group delay compensation in a multi-core fiber

Esben Ravn Andresen; Siddharth Sivankutty; Géraud Bouwmans; Olivier Vainvinq; Laurent Gallais; Serge Monneret; Hervé Rigneault

doi:10.1117/12.2183676

14 July 2015 Towards two-photon lensless endoscopes: inter-core group delay compensation in a multi-core fiber

Esben Ravn Andresen, Siddharth Sivankutty, Géraud Bouwmans, Olivier Vainvinq, Laurent Gallais, Serge Monneret, Hervé Rigneault

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Proceedings Volume 9536, Advanced Microscopy Techniques IV; and Neurophotonics II; 953605 (2015) https://doi.org/10.1117/12.2183676
Event: European Conferences on Biomedical Optics, 2015, Munich, Germany

Abstract

We map out the group delays of all the 169 single-mode cores of a 30 cm long multi-core fiber using phaseshifting spectral interferometry. We then present and apply a new experimental concept suitable for partially compensating the measured inter-core group delay dispersion. The compensation scheme is based on two wave front shapers in a 4-f geometry and group delays are imposed in the Fourier plane between them. These results are of relevance for cases where one desires to perform imaging through optical fibers using femtosecond excitation as is the case in the two-photon lensless endoscopes which have recently been demonstrated.

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Esben Ravn Andresen, Siddharth Sivankutty, Géraud Bouwmans, Olivier Vainvinq, Laurent Gallais, Serge Monneret, and Hervé Rigneault "Towards two-photon lensless endoscopes: inter-core group delay compensation in a multi-core fiber", Proc. SPIE 9536, Advanced Microscopy Techniques IV; and Neurophotonics II, 953605 (14 July 2015); https://doi.org/10.1117/12.2183676

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KEYWORDS

Endoscopes

Wavefronts

Femtosecond phenomena

Interferometry

Waveguides

Cladding

Endoscopy

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