Coherent supercontinuum generation in photonic crystal fiber with all-normal group velocity dispersion

We demonstrate supercontinuum generation in a photonic crystal fiber with all-normal group velocity dispersion. Pumping a short section of this fiber with compressed pulses from a compact amplified fiber laser generates a 200 nm bandwidth continuum with typical self-phasemodulation characteristics. We demonstrate that the supercontinuum is compressible to a duration of 26 fs. It therefore has a high degree of coherence between all the frequency components, and is a single pulse in the time domain. A smooth, flat spectrum spanning 800 nm is achieved using a longer piece of fiber. ©2011 Optical Society of America OCIS codes: (320.6629) Supercontinuum generation; (060.4005) Microstructured fibers. References and links 1. J. C. Knight, “Photonic crystal fibres,” Nature 424(6950), 847–851 (2003). 2. J. K. Ranka, R. S. Windeler, and A. J. Stentz, “Visible continuum generation in air-silica microstructure optical fibers with anomalous dispersion at 800 nm,” Opt. Lett. 25(1), 25–27 (2000). 3. 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