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Mid-infrared femtosecond optical frequency combs were produced by differencefrequency generation of the spectral components of a near-infrared comb in a3-mm-long MgO:PPLN crystal. We observe strong pump depletion and 9.3 dBparametric gain in the 1.5 \mu m signal, which yields powers above 500 mW (3\mu W/mode) in the idler with spectra covering 2.8 \mu m to 3.5 \mu m.Potential for broadband, high-resolution molecular spectroscopy is demonstratedby absorption spectra and interferograms obtained by heterodyning two combs.

Mid-Infrared Optical Frequency Combs based on Difference Frequency Generation for Molecular Spectroscopy