非表示:
キーワード:
ULTRAFAST NONLINEAR OPTICS; HOLLOW-CORE PCF; SUPERCONTINUUM GENERATION;
MID-IR; FEMTOSECOND FILAMENTATION; CHALCOGENIDE FIBER; MU-M; UV; REGIME;
POWERScience & Technology - Other Topics;
要旨:
Gas-filled hollow-core photonic crystal fibre is being used to generate ever wider super-continuum spectra, in particular via dispersive wave emission in the deep and vacuum ultraviolet, with a multitude of applications. Dispersive waves are the result of nonlinear transfer of energy from a self-compressed soliton, a process that relies crucially on phase-matching. It was recently predicted that, in the strong-field regime, the additional transient anomalous dispersion introduced by gas ionization would allow phase-matched dispersive wave generation in the mid-infrared-something that is forbidden in the absence of free electrons. Here we report the experimental observation of such mid-infrared dispersive waves, embedded in a 4.7-octave-wide supercontinuum that uniquely reaches simultaneously to the vacuum ultraviolet, with up to 1.7W of total average power.
