14 July 2015 Towards two-photon lensless endoscopes: inter-core group delay compensation in a multi-core fiber
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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, Esben Ravn Andresen, Siddharth Sivankutty, Siddharth Sivankutty, Géraud Bouwmans, Géraud Bouwmans, Olivier Vainvinq, Olivier Vainvinq, Laurent Gallais, Laurent Gallais, Serge Monneret, Serge Monneret, Hervé Rigneault, 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); doi: 10.1117/12.2183676; https://doi.org/10.1117/12.2183676
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