We show numerically, how a chalcogenide planar waveguide designed to exhibit normal dispersion over a wide spectral range around the pump wavelength can produce relatively flat supercontinuum in the mid-infrared regime. A 1-cm-long channel waveguide, made using Ge11.5As24Se64.5 glass and pumped at 1.55 gm using short optical pulses with only 25 W peak power, produced a supercontinuum that was nearly 600 nm wide. Employing the same pump source with a peak power of 100 W, the supercontinuum could be extended to beyond 2.2 gm with a bandwidth of 1000 nm. By shifting the pump wavelength to 3.1 gm and using pulses with peak powers of up to 3 kW, the resulting ultraflat supercontinuum extended from 2 to 5.5 gm. Even a wider spectral range (1.8-6 gm) can be realized if MgF2 glass is used for the lower cladding while maintaining power variations below 5 dB over the entire bandwidth.
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