Broadband mid-infrared supercontinuum generation in novel As2Se3-As2Se2S step-index fibers

We experimentally demonstrate the mid-infrared supercontinuum generation in a chalcogenide step-index fiber consisting of an As2Se3 core and an As2Se2S cladding. The fiber with the core diameter of 21 mu m was fabricated through the rod-in-tube technique and fiber-drawing process. The effect of pump wavelength, fiber length, and pump power on the spectral bandwidth and output power of the supercontinuum spectra generated from the fiber pumped by the ultrashort pulses of similar to 150 fs with a repetition rate of 1000 Hz was systematically investigated. When pumping a 12-cm-long fiber at a wavelength of 6.5 mu m with 14 mW pump laser power, a broadband supercontinuum spanning from 2.0 mu m to 12.7 mu m with an output power of 300 mu W was obtained. (C) 2017 Elsevier B.V. All rights reserved.