All-fiber source of high-power picosecond pulses at 1.5μm using short heavily-doped phosphate-fiber amplifier

We report using short, heavily-doped active phosphate fiber for generation of picosecond pulses at 1.5 mum, with the peak power of 19 kW which results in a record-high aerial power density of 24 GW/cm 2 in the fiber core.