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  "title": "Mid-infrared supermirrors with finesse exceeding 400 000",
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    "Data from peer-reviewed publication:  G.-W. Truong et al., Mid-infrared supermirrors with finesse exceeding 400 000, Nature Communications. For trace gas sensing and precision spectroscopy, optical cavities incorporating low-loss mirrors are indispensable for path length and optical intensity enhancement. Optical interference coatings in the visible and near-infrared (NIR) spectral regions have achieved total optical losses below 2 parts per million (ppm), enabling a cavity finesse in excess of 1 million. However, such advancements have been lacking in the mid-infrared (MIR), despite substantial scientific interest. Here, we demonstrate a significant breakthrough in high-performance MIR mirrors, reporting substrate-transferred single-crystal interference coatings capable of cavity finesse values from 200 000 to 400 000 near 4.5 microns, with excess optical losses (scatter and absorption) below 5 ppm. In a first proof-of-concept demonstration, we achieve the lowest noise-equivalent absorption in a linear cavity ring-down spectrometer normalized by cavity length. This substantial improvement in performance will unlock a rich variety of MIR applications for atmospheric transport and environmental sciences, detection of fugitive emissions, process gas monitoring, breath-gas analysis, and verification of biogenic fuels and plastics."
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      "title": "Mid-infrared supermirrors with finesse exceeding 400 000",
      "issued": "2022",
      "citation": "Truong, G.-W., Perner, L. W., Bailey, D. M., Winkler, G., Cata\u00f1o-Lopez, S. B., Wittwer, V. J., Sudmeyer, T., Nguyen, C., Follman, D., Fleisher, A. J., Heckl, O. H., &amp; Cole, G. D. (2022). <i>Mid-infrared supermirrors with finesse exceeding 400 000</i> (Version 3). arXiv. https://doi.org/10.48550/ARXIV.2209.09902"
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