Bài báo khoa học

We numerically investigate the near-zero flat dispersion supercontinuum generation (SCG) in hollow-core square photonic crystal fibers (PCFs) with benzene-core (C6H6). Different air hole sizes in the rings result in a structure that simultaneously optimizes fiber properties. A unique combination between low all-normal dispersion and high nonlinearity enables low-noise SC covering 0.72–1.76 μm. This requires 0.45 kW of peak power realized by ultrafast standard erbium-fiber laser with 40 fs pulse duration. PCF with an anomalous dispersion enables SCG to cover the spectral range of 0.8–3.95 μm at 1.55 μm when pumped by power pulses less than 0.55 kW. This is a much lower input power level than previously for SCG with bandwidths greater than one octave in liquid-core structures. Our results show that liquid-core fibers are a promising method to scale the SC spectrum with pump lasers with limited peak power per pulse. Such fibers are often used in frequency measurement, optical communication, and high-speed nonlinear imaging.