Generation of a mW-class broadband mid-infrared comb using a waveguide-type PPLN crystal and its application to dual-comb spectroscopy

We generated a broadband mid-infrared comb of 2.7-4.6 μm with an output of 2.7 mW based on an Er:fiber comb as a fundamental light using a waveguide-type PPLN crystal. A dual-comb spectrometer using these combs was developed.