We report generation of an ultrafast supercontinuum extending into the mid- infrared in gas-filled single-ring hollow-core photonic crystal fiber (SR-PCF) pumped by 1.7 µm light from an optical parametric amplifier. The simple fiber structure offers shallow dispersion and flat transmission in the near and mid-infrared, enabling the generation of broadband spectra extending from 270 nm to 3.1 µm, with a total energy of a few µJ. In addition, we demonstrate the emission of ultraviolet dispersive waves whose frequency can be tuned simply by adjusting the pump wavelength. SR-PCF thus constitutes an effective means of compressing and delivering tunable ultrafast pulses in the near and mid-infrared spectral regions.
Cassataro, M., Novoa, D., Günendi, M. C., Edavalath, N. N., Frosz, M. H., Travers, J. C., & Russell, P. S. J. (2017). Generation of broadband mid-IR and UV light in gas-filled single-ring hollow-core PCF. Optics Express, 25(7), 7637-7644. https://doi.org/10.1364/OE.25.007637