Direct-comb molecular spectroscopy with accurate, resolved comb teeth over 43 THz

We demonstrate a dual-comb spectrometer using stabilized frequency combs spanning 177 to 220 THz (1360 to 1690 nm) in the near infrared. Comb-tooth-resolved measurements of amplitude and phase generate over 4×10(5) individually resolved spectral elements at 100 MHz point spacing and kilohertz-level...

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Bibliographic Details
Published in:Optics letters 2012-02, Vol.37 (4), p.638-640
Main Authors: Zolot, A M, Giorgetta, F R, Baumann, E, Nicholson, J W, Swann, W C, Coddington, I, Newbury, N R
Format: Article
Language:English
Subjects:
Amplitudes
Blackbody
Carbon dioxide
Infrared
Molecular spectroscopy
Signal to noise ratio
Spectra
Teeth
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Summary:We demonstrate a dual-comb spectrometer using stabilized frequency combs spanning 177 to 220 THz (1360 to 1690 nm) in the near infrared. Comb-tooth-resolved measurements of amplitude and phase generate over 4×10(5) individually resolved spectral elements at 100 MHz point spacing and kilohertz-level resolution and accuracy. The signal-to-noise ratio is 100 to 3000 per comb tooth. Doppler-broadened phase and amplitude spectra of CO(2), CH(4), C(2)H(2), and H(2)O in a 30 m multipass cell agree with established spectral parameters, achieving high-resolution measurements with optical bandwidth generally associated with blackbody sources.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.37.000638