Mid-infrared frequency comb spanning an octave based on an Er fiber laser and difference-frequency generation

Fritz Keilmann, Sergiu Amarie

We describe a coherent mid-infrared continuum source with 700 cm-1 usable bandwidth, readily tuned within 600 - 2500 cm-1 (4 - 17 \mum) and thus covering much of the infrared "fing…