Time-resolved mid-infrared dual-comb spectroscopy
arXiv:1908.10442 · doi:10.1038/s41598-019-53825-8
Abstract
Dual-comb spectroscopy can provide broad spectral bandwidth and high spectral resolution in a short acquisition time, enabling time-resolved measurements. Specifically, spectroscopy in the mid-infrared wavelength range is of particular interest, since most of the molecules have their strongest rotational-vibrational transitions in this "fingerprint" region. Here we report time-resolved mid-infrared dual-comb spectroscopy for the first time, covering ~300 nm bandwidth around 3.3 μm with 6 GHz spectral resolution and 20 μs temporal resolution. As a demonstration, we study a CH4/He gas mixture in an electric discharge, while the discharge is modulated between dark and glow regimes. We simultaneously monitor the production of C2H6 and the vibrational excitation of CH4 molecules, observing the dynamics of both processes. This approach to broadband, high-resolution, and time-resolved mid-infrared spectroscopy provides a new tool for monitoring the kinetics of fast chemical reactions, with potential applications in various fields such as physical chemistry and plasma/combustion analysis.
arXiv comment21 page, 6 figures
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- Time-resolved dual-comb spectroscopy with a single electro-optic modulator
- Tunable dual-comb spectrometer for mid-infrared trace gas analysis from 3 to 4.7 μm
- Supersonic Combustion Diagnostics with Dual Comb Spectroscopy
- Dual-comb Spectroscopy of Ammonia Formation in Non-thermal Plasmas
- Precision spectroscopy of non-thermal molecular plasmas using mid-infrared optical frequency comb Fourier transform spectroscopy
- Heterodyne coherent detection of the electric field temporal trace emitted by frequency-modulated comb lasers
- An air-spaced virtually imaged phased array with 94 MHz resolution for precision spectroscopy