Towards focusing broad band light through a multimode fiber endoscope

0509406 - ÚPT 2020 RIV US eng C - Conference Paper (international conference)
Traegaardh, Johanna - Pikálek, Tomáš - Simpson, Stephen Hugh - Jákl, Petr - Šiler, Martin - Tyc, Tomáš - Čižmár, Tomáš
Towards focusing broad band light through a multimode fiber endoscope.
Adaptive Optics and Wavefront Control for Biological Systems V. Proceedings of SPIE. Vol. 10886. Bellingham: SPIE, 2019, č. článku 108860J. ISBN 978-1-5106-2414-6. ISSN 0277-786X.
[Conference on Adaptive Optics and Wavefront Control for Biological Systems /5./. San Francisco (US), 03.02.2019-04.02.2019]
R&D Projects: GA MŠMT EF15_003/0000476; GA MŠMT(CZ) LO1212; GA MŠMT ED0017/01/01
Institutional support: RVO:68081731
Keywords : multimode fiber * multi -photon imaging * adaptive optics * GRIN fiber * spatial light modulator * spectral interferometry
OECD category: Optics (including laser optics and quantum optics)

When using multimode fibers as high -resolution endoscopes, advanced adaptive optics is needed to overcome the modal dispersion which scrambles the image. Additionally, for non-linear imaging methods, all the wavelengths of a femtosecond laser pulse must be simultaneously focused at the sample plane, with appropriate dispersion compensation, that might vary across the sample area. We investigate the bandwidth of the focused spot for a graded index fiber used as a point scanning imaging device. We demonstrate that with proper compensation for the dispersion of the spatial light modulator this can be >45 nm. We also measure the spectral phase at the sample plane, and demonstrate that this does not vary substantially with spot position.
Permanent Link: http://hdl.handle.net/11104/0300164