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• W806204168 abstract "One of the issues that has to be overcome to realize a nonlinear endoscope for biomedical applications is the propagation of ultra-short pulses in an optical fiber. Nonlinear processes require high peak powers in the focal volume in order to generate observable signals, so the pulses should be as short as possible. This makes them sensitive to the dispersion and nonlinearities of the fibers. Most of the existing techniques of ultra-short pulses fiber-delivery rely on complex pre-compensation systems to counteract these effects. In this work, we explore the possibilities offered by the generation of high-energy solitons in a custom-built solid-core photonic bandgap fiber, for nonlinear microscopy and spectroscopy. Optical solitons preserve their shape when they propagate in a fiber, and their duration remains close to the minimum value physically allowed by their bandwidth, without the need of any pre-compensation. Moreover, the wavelength and delay of the soliton can be tuned by changing the power at the input of the fiber. Several soliton-based light sources were designed and realized, generating contrast in the most prevalent nonlinear microscopy modalities. TPEF and SHG images of biological samples were first realized by taking advantage of the short duration of the solitons. By controlling the delay of the soliton, transient absorption measurements were then realized in a pump-probe configuration. Finally, the wavelength tunability of the soliton was used to generate the Stokes beam in a CRS setup based on the spectral focusing technique. The capabilities of this scheme were demonstrated by performing CRS microspectroscopy to monitor a chemical equilibrium." @default.
• W806204168 created "2016-06-24" @default.
• W806204168 creator A5079552797 @default.
• W806204168 date "2014-11-25" @default.
• W806204168 modified "2023-09-24" @default.
• W806204168 title "Sources optiques fibrées solitoniques pour la spectroscopie et la microscopie non linéaires" @default.
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