Controllable two-color dispersive wave generation in argon-filled hypocycloid-core kagome fiber


We demonstrate two-color dispersive wave emission in the ultraviolet and near-infrared regions in an argon filled hypocycloid-core kagome fiber pumped by a femtosecond laser around 1 μm. These two dispersive waves show drastically distinct features in terms of bandwidth and tunability. The dispersive wave in the ultraviolet region has a bandwidth of tens of nanometers and can be widely tuned from at least 267 nm to 460 nm by changing the gas pressure, input pulse energy, and pump wavelength. In contrast, the dispersive wave in the near-infrared region has a narrower bandwidth of ~5 nm and is quite stably positioned near the edge of the fundamental transmission band even if the gas pressure or input pulse energy is significantly changed. An antiresonant tube model is applied to explain the experimental results and a good agreement is found between them. The dynamics show that the narrow-band dispersive wave in the near-infrared region originates from the steep slope of the dispersion near the edge of the transmission band.

Opt. Express