Microresonator-based high-resolution gas spectroscopy
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.
Cite
@article{arxiv.1707.04322,
title = {Microresonator-based high-resolution gas spectroscopy},
author = {Mengjie Yu and Yoshitomo Okawachi and Austin G. Griffith and Michal Lipson and Alexander L. Gaeta},
journal= {arXiv preprint arXiv:1707.04322},
year = {2017}
}