Two-octave mid-infrared supercontinuum pumped by a 4.5 µm femtosecond fiber source

We report on the generation of 35 kW, 180 fs pulses above 4 μm by soliton self-frequency shift from a 2 µm fiber-based laser and their application to the generation of two-octave mid-infrared supercontinuum in chalcogenide fiber.