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We demonstrate mid-infrared (mid-IR) supercontinuum generation (SCG) withinstantaneous bandwidth from 2.2 to 5 {\mu}m at 40 dB below the peak, coveringthe wavelength range desirable for molecular spectroscopy and numerous otherapplications. The SCG occurs in a tapered As2S3 fiber prepared by in-situtapering and is pumped by femtosecond pulses from the subharmonic of amode-locked Er-doped fiber laser. Interference with a narrow linewidth c.w.laser verifies that the coherence properties of the near-IR frequency comb havebeen preserved through these cascaded nonlinear processes. With this approachstable broad mid-IR frequency combs can be derived from commercially availablenear-IR frequency combs without an extra stabilization mechanism.

Mid-infrared supercontinuum generation in tapered chalcogenide fiber for producing octave-spanning frequency comb around 3 {\mu}m