Ultrashort Mid-IR Pulse Amplification in Chalcogenide Fibers Doped with Rare-Earth Ions

We present a numerical study of ultrashort pulse amplification in the 4-5 microns range in chalcogenide gain fibers singly doped with praseodymium, dysprosium, and terbium ions. The energy of pulses with a repetition rate of 10 MHz can be increased from 10 pJ up to ~10 nJ for praseodymium and terbium and up to ~1 nJ for dysprosium.