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Proceedings Paper

Towards two-photon lensless endoscopes: inter-core group delay compensation in a multi-core fiber
Author(s): Esben Ravn Andresen; Siddharth Sivankutty; Géraud Bouwmans; Olivier Vainvinq; Laurent Gallais; Serge Monneret; Hervé Rigneault
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Paper 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.

Paper Details

Date Published: 14 July 2015
PDF: 8 pages
Proc. SPIE 9536, Advanced Microscopy Techniques IV; and Neurophotonics II, 953605 (14 July 2015); doi: 10.1117/12.2183676
Show Author Affiliations
Esben Ravn Andresen, Institut Fresnel, CNRS, Aix-Marseille Univ. (France)
Siddharth Sivankutty, Institut Fresnel, CNRS, Aix-Marseille Univ. (France)
Géraud Bouwmans, PhLAM, CNRS, Univ. Lille 1 (France)
Olivier Vainvinq, PhLAM, CNRS, Univ. Lille 1 (France)
Laurent Gallais, Institut Fresnel, CNRS, Aix-Marseille Univ. (France)
Serge Monneret, Institut Fresnel, CNRS, Aix-Marseille Univ. (France)
Hervé Rigneault, Institut Fresnel, CNRS, Aix-Marseille Univ. (France)


Published in SPIE Proceedings Vol. 9536:
Advanced Microscopy Techniques IV; and Neurophotonics II
Emmanuel Beaurepaire; Francesco Pavone; Elizabeth M. Hillman; Peter T. C. So, Editor(s)

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