Comb-calibrated sub-Doppler spectroscopy with an external-cavity quantum cascade laser at 77 μm | Zendy

Bidoor Alsaif | Zendy; Davide Gatti | Zendy; Marco Lamperti | Zendy; P. Laporta | Zendy; Aamir Farooq | Zendy; Marco Marangoni | Zendy

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Comb-calibrated sub-Doppler spectroscopy with an external-cavity quantum cascade laser at 77 μm

Author(s) -

Bidoor Alsaif,

Davide Gatti,

Marco Lamperti,

P. Laporta,

Aamir Farooq,

Marco Marangoni

Publication year - 2019

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.27.023785

Subject(s) - laser linewidth , quantum cascade laser , optics , frequency comb , spectroscopy , laser , doppler effect , cascade , materials science , cavity ring down spectroscopy , calibration , physics , chemistry , chromatography , quantum mechanics , astronomy

We study the frequency noise and the referencing to a near-infrared frequency comb of a widely tunable external-cavity quantum-cascade-laser that shows a relatively narrow free-running emission linewidth of 1.7 MHz. The frequency locking of the laser to the comb further narrows its linewidth to 690 kHz and enables sub-Doppler spectroscopy on an N 2 O transition of the ν 1 band near 7.7 μm with sub-MHz resolution and absolute frequency calibration. The combined uncertainty on the measured transition center is estimated to be less than 50 kHz.

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