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Quantum cascade laser optical frequency combs are opening new possibilities in mid-infrared spectroscopy. Using a dual comb spectroscopy, spectrum acquisition at 8um were achieved with a very short time resolution (10us) and very high accuracy (1m Absorbance); using interleaving techniques high resolution (~3MHz) measurements over a full bandwidth of 55cm-1 with an acquisition time of only 120ms were achieved. In this context, we discuss improvement of the QCL comb stability using ring QCLs geometries, RF injection in specially designed devices. Furthermore, we perform the comparison between the coherent intermode beat spectroscopy and upconversion of the output intensity as characterization tools for the comb.
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