
1.Laboratory Charles Fabry, Institut d’Optique Graduate School, CNRS, Université Paris-Saclay, 91128 Palaiseau, France
2.Laboratory for Optics and Biosciences, Ecole Polytechnique, CNRS, INSERM, 91128 Palaiseau, France
3.Vision Institute, CNRS Sorbonne Universités, Université Paris 6, INSERM, 75012 Paris, France
4.Zebrafish Neurogenetics Unit, Developmental and Stem Cell Biology Department, Institut Pasteur, CNRS, 75015 Paris, France
Emmanuel Beaurepaire (emmanuel.beaurepaire@polytechnique.edu)
Frédéric. Druon (frederic.druon@institutoptique.fr)
Published:2018,
Published Online:06 June 2018,
Received:20 September 2017,
Revised:12 February 2018,
Accepted:23 February 2018
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Guesmi, K. et al. Dual-color deep-tissue three-photon microscopy with a multiband infrared laser. Light: Science & Applications, 4, 119-127 (2018).
Guesmi, K. et al. Dual-color deep-tissue three-photon microscopy with a multiband infrared laser. Light: Science & Applications, 4, 119-127 (2018). DOI: 10.1038/s41377-018-0012-2.
Multiphoton microscopy combined with genetically encoded fluorescent indicators is a central tool in biology. Three-photon (3P) microscopy with excitation in the short-wavelength infrared (SWIR) water transparency bands at 1.3 and 1.7 µm opens up new opportunities for deep-tissue imaging. However
novel strategies are needed to enable in-depth multicolor fluorescence imaging and fully develop such an imaging approach. Here
we report on a novel multiband SWIR source that simultaneously emits ultrashort pulses at 1.3 and 1.7 µm that has characteristics optimized for 3P microscopy: sub-70 fs duration
1.25 MHz repetition rate
and µJ-range pulse energy. In turn
we achieve simultaneous 3P excitation of green fluorescent protein (GFP) and red fluorescent proteins (mRFP
mCherry
tdTomato) along with third-harmonic generation. We demonstrate in-depth dual-color 3P imaging in a fixed mouse brain
chick embryo spinal cord
and live adult zebrafish brain
with an improved signal-to-background ratio compared to multicolor two-photon imaging. This development opens the way towards multiparametric imaging deep within scattering tissues.
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