Le Siècle de Romain Gary

Collection ActesInternational audienc

Label-free highly multimodal nonlinear endoscope

International audienceWe demonstrate a 2 mm diameter highly multimodal nonlinear micro-endoscope allowing label-free imaging of biological tissues. The endoscope performs multiphoton fluorescence (3-photon, 2-photon), harmonic generation (second-SHG and third-THG) and coherent anti-Stokes Raman scattering (CARS) imaging over a field of view of 200 µm. The microendoscope is based on a double-clad antiresonant hollow core fiber featuring a high transmission window (850 nm to 1800 nm) that is functionalized with a short piece of graded-index (GRIN) fiber. When combined with a GRIN micro-objective, the micro-endoscope achieves a 1.1 µm point spread function (PSF). We demonstrate 3-photon, 2-photon, THG, SHG, and CARS high resolution images of unlabelled biological tissues

Label-free three photon micro-endoscope

International audienceWe report the first three photon micro-endoscope enabling imaging of unlabeled biological tissues. It is based on a double clad antiresonant hollow-core fiber which is designed to make the endoscope highly multimodal (2PEF, 3PEF, SHG, THG, CARS)

Double clad tubular anti-resonant hollow core fiber for nonlinear microendoscopy

International audienceWe report the fabrication and characterization of the first double clad tubular anti-resonant hollow core fiber. It allows to deliver ultrashort pulses without temporal nor spectral distortions in the 700-1000 nm wavelength range and to efficiently collect scattered light in a high numerical aperture double clad. The output fiber mode is shaped with a silica microsphere generating a photonic nanojet, making it well suitable for nonlinear microendoscopy application. Additionally, we provide an open access software allowing to find optimal drawing parameters for the fabrication of tubular hollow core fibers

Silicon-core optical fiber with losses below 0.2dB/cm

International audienceSilicon-core fibers were drawn into hundreds of meter-long spans. The regular crystalline structure of the core and the absence of oxygen contamination are demonstrated together with loss below 0.2 dB/cm from 1250 to 1650 nm