Broadband mid-infrared supercontinuum generation in AlGaAs photonic crystal fibers by liquid infiltration and rod-filling approaches

This paper numerically investigates the supercontinuum generation in a regular dispersion zone (normal + anomalous) and an all-normal dispersion zone in a photonic crystal fiber (PCF). The novelty of this fiber is that both stated dispersion zones are obtained in a single proposed solid-core fiber using the infiltration and rod filling approach by employing the finite element method. This fiber is composed of AlGaAs material in place of conventional fused silica to obtain high nonlinearity over a large wavelength span when a 14 kW peak power, 50 fs initial energy pulse is applied into a 5 mm-long PCF to obtain a spectrum bandwidth of a 10.22 mu m region for anomalous dispersion pumping and a 10.05 mu m region for all-normal dispersion pumping. These results reveal that the proposed unique structure can be suitable for molecular fingerprinting, medical bio-imaging, and disease detection in the mid-IR window.