In this work, Etienne Genier and coauthors present an octave-spanning, highly coherent SC fiber laser at visible and near-IR wavelengths with relative intensity noise of only 0.5%, about two orders of magnitude lower than typical commercial SC sources and one of the lowest values ever reported. They achieved this by fabricating a highly birefringent all-normal dispersion (ANDi) photonic crystal fiber, a design that effectively suppresses noise-amplifying nonlinear effects under femtosecond pumping. The source exhibits superb spectral flatness, high spectral power density of 0.4 mW/nm, high polarization extinction ratio of 17 dB, and a simple temporal pulse shape with near-linear chirp. These results impressively illustrate the potential of ANDi SC sources for applications, which so far were not able to use conventional, soliton-based fiber SC sources due to their noise or complex temporal pulse shape.
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