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Quantum cascade laser (QCL) frequency combs have revolutionized mid-infrared(MIR) spectroscopy by their high brightness and fast temporal resolution, andare a promising technology for fully-integrated and cost-effective sensors. Asfor other integrated comb sources such as micro-combs and interband cascadelaser, QCLs have a comb spacing of several GHz, which is adequate formeasurements of wide absorbing structures, typically found in liquid or solidsamples. However, high-resolution gas-phase spectra require spectralinterleaving and frequency calibration. We developed a frequency calibrationscheme for fast interleaved measurements with combs featuring multi-GHzspacing. We then demonstrate dual-comb spectroscopy with 600 kHz accuracy insingle-shot 54-ms measurements over 40 cm$^{-1}$ using two QCLs at 7.8$\mathrm{\mu}$m. This work is an important contribution towards fastfingerprinting of complex molecular mixtures in the MIR. Moreover, thecalibration scheme could be used with micro-combs for spectroscopy and ranging,both in comb-swept and comb-calibrated setups.

High-Resolution Quantum Cascade Laser Dual-Comb Spectroscopy in the Mid-Infrared with Absolute Frequency Referencing