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arXiv · 1707.04322

Microresonator-based high-resolution gas spectroscopy

Mengjie Yu·Yoshitomo Okawachi·Austin G. Griffith·Michal Lipson·Alexander L. Gaeta
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Abstract

In recent years, microresonator-based optical frequency combs have created up opportunities for developing a spectroscopy laboratory on a chip due to its broadband emission and high comb power. However, with mode spacings typically in the range of 10 - 1000 GHz, the realization of a chip-based high-resolution spectrometer suitable for gas-phase spectroscopy has proven to be difficult. Here, we show mode-hop-free tuning of a microresonator-based frequency comb over 16 GHz by simultaneously tuning both the pump laser and the cavity resonance. We illustrate the power of this scanning technique by demonstrating gas-phase molecular fingerprinting of acetylene with a high-spectral-resolution of < 80 MHz over a 45-THz optical bandwidth in the mid-IR. Our technique represents a significant step towards on-chip gas sensing with an ultimate spectral resolution given by the comb linewidth.

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Mengjie Yu, Yoshitomo Okawachi, Austin G. Griffith, Michal Lipson, Alexander L. Gaeta. 2017-07-12. Microresonator-based high-resolution gas spectroscopy. https://doi.org/10.1364/ol.42.004442

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