Coherent widely tunable source of sub-picosecond pulses using all-normal dispersion fiber supercontinuum

We describe supercontinuum generation using photonic crystal fibres with all-normal group velocity dispersion profiles, pumped at 1064 nm and 800 nm wavelengths. Highly coherent and stable continua are demonstrated experimentally. We present pulse duration measurements obtained when spectrally filtering the all-normal dispersion supercontinuum, and show that this method is an excellent candidate for use as a compact, low-noise, tunable ultrafast laser source. Experimental spectral and temporal measurements are interpreted using numerical simulations, and experiment and modeling are shown to be in very good agreement.