Direct-comb molecular spectroscopy with accurate, resolved comb teeth over 43 THz |
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| Authors: | Zolot A M Giorgetta F R Baumann E Nicholson J W Swann W C Coddington I Newbury N R |
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| Institution: | National Institute of Standards and Technology, Boulder, Colorado 80305, USA. Alex.Zolot@nist.gov |
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| Abstract: | 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. |
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