Absolute spectroscopy near 7.8 μm with a comb-locked extended-cavity quantum-cascade-laser

Marco Lamperti, Bidoor Alsaif, Davide Gatti, Martin Fermann, Paolo Laporta, Aamir Farooq, Marco Marangoni

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We report the first experimental demonstration of frequency-locking of an extended-cavity quantum-cascade-laser (EC-QCL) to a near-infrared frequency comb. The locking scheme is applied to carry out absolute spectroscopy of N2O lines near 7.87 {\mu}m with an accuracy of ~60 kHz. Thanks to a single mode operation over more than 100 cm^{-1}, the comb-locked EC-QCL shows great potential for the accurate retrieval of line center frequencies in a spectral region that is currently outside the reach of broadly tunable cw sources, either based on difference frequency generation or optical parametric oscillation. The approach described here can be straightforwardly extended up to 12 {\mu}m, which is the current wavelength limit for commercial cw EC-QCLs.
Original languageEnglish (US)
JournalApplied Physics
StatePublished - Jul 31 2017

Bibliographical note

4 pages, 3 figures


  • physics.ins-det
  • physics.optics


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