Abstract

We demonstrate a dual-comb spectrometer using stabilized frequency combs spanning 177 to 220THz (1360 to 1690nm) in the near infrared. Comb-tooth-resolved measurements of amplitude and phase generate over 4×105 individually resolved spectral elements at 100MHz 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 CO2, CH4, C2H2, and H2O in a 30m multipass cell agree with established spectral parameters, achieving high-resolution measurements with optical bandwidth generally associated with blackbody sources.

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