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Control of pulse-to-pulse fluctuations in visible supercontinuum
A Kudlinski1, B Barviau, A Leray
1Université Lille 1, IRCICA, FR CNRS 3024, Laboratoire PhLAM, UMR CNRS 8523, Villeneuve d'Ascq, France. alexandre.kudlinski@univ-lille1.fr
Abstract:
Long-pulse supercontinuum sources are initiated by modulation instability and consequently suffer from stochastic shot-to-shot variations of their spectral power density. In this paper, we provide a measurement of pulse-to-pulse fluctuations over the whole supercontinuum spectrum, and we show that their spectral dependence follows the group index curve of the fiber. Then, we demonstrate a significant reduction of supercontinuum pulse-to-pulse fluctuations in the visible by using a photonic crystal fiber with longitudinally tailored guidance properties. We finally show numerically that this new source would allow a significant improvement of the signal-to-noise ratio in fluorescence microscopy.
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