Architecture for microcomb-based GHz-mid-infrared dual-comb spectroscopy

Chengying Bao, Zhiquan Yuan, Lue Wu, Myoung-Gyun Suh, Heming Wang, Qiang Lin and Kerry J. Vahala ()
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Chengying Bao: California Institute of Technology
Zhiquan Yuan: California Institute of Technology
Lue Wu: California Institute of Technology
Myoung-Gyun Suh: California Institute of Technology
Heming Wang: California Institute of Technology
Qiang Lin: University of Rochester
Kerry J. Vahala: California Institute of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Dual-comb spectroscopy (DCS) offers high sensitivity and wide spectral coverage without the need for bulky spectrometers or mechanical moving parts. And DCS in the mid-infrared (mid-IR) is of keen interest because of inherently strong molecular spectroscopic signatures in these bands. We report GHz-resolution mid-IR DCS of methane and ethane that is derived from counter-propagating (CP) soliton microcombs in combination with interleaved difference frequency generation. Because all four combs required to generate the two mid-IR combs rely upon stability derived from a single high-Q microcavity, the system architecture is both simplified and does not require external frequency locking. Methane and ethane spectra are measured over intervals as short as 0.5 ms, a time scale that can be further reduced using a different CP soliton arrangement. Also, tuning of spectral resolution on demand is demonstrated. Although at an early phase of development, the results are a step towards mid-IR gas sensors with chip-based architectures for chemical threat detection, breath analysis, combustion studies, and outdoor observation of trace gases.

Date: 2021
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DOI: 10.1038/s41467-021-26958-6

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