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Video-rate broadband longwave IR dual-comb spectroscopy with 240,000 comb-mode resolved data points

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Video-rate broadband longwave IR dual-comb spectroscopy with 240,000 comb-mode resolved data points

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  • Author: S. Vasilyev, A. Muraviev, D. Konnov, M. Mirov, V. Smoslki, I. Moskalev, S. Mirov, & K. Vodopyanov
We report molecular detection using dual frequency-comb spectroscopy with highly coherent broadband (6.6-11.4 µm) long-wavelength infrared (LWIR) combs. The combs were produced via intra-pulse difference frequency generation (IDFG) in ZGP crystals using sub-three-cycle (20 fs) driving pulses from mode-locked Cr:ZnS lasers at the central wavelength of 2.4 µm). Real-time and up to video rate (0.1-12 s per spectrum) acquisition of molecular spectra with some 240,000 comb-mode-resolved data points spaced by 80 MHz and referenced to a Rb clock with a signal-to-noise ratio (SNR) >300 has been demonstrated.

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