{"@type": "dcat:Dataset", "accessLevel": "public", "bureauCode": ["006:55"], "contactPoint": {"fn": "Adam Fleisher", "hasEmail": "mailto:adam.fleisher@nist.gov"}, "description": "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.", "distribution": [{"downloadURL": "https://data.nist.gov/od/ds/mds2-3089/Fig2.xlsx", "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "title": "Fig2"}, {"downloadURL": "https://data.nist.gov/od/ds/mds2-3089/Fig3.xlsx", "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "title": "Fig3"}, {"downloadURL": "https://data.nist.gov/od/ds/mds2-3089/Fig4.xlsx", "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "title": "Fig4"}, {"downloadURL": "https://data.nist.gov/od/ds/mds2-3089/Fig5.xlsx", "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "title": "Fig5"}, {"downloadURL": "https://data.nist.gov/od/ds/mds2-3089/readme.txt", "mediaType": "text/plain", "title": "readme"}], "identifier": "ark:/88434/mds2-3089", "issued": "2023-11-07", "keyword": ["cavity ring-down spectroscopy", "greenhouse gases", "mid-infrared", "mirrors", "optical interference coatings", "optical metrology", "process gas analysis"], "landingPage": "https://data.nist.gov/od/id/mds2-3089", "language": ["en"], "license": "https://www.nist.gov/open/license", "modified": "2023-10-03 00:00:00", "programCode": ["006:045"], "publisher": {"@type": "org:Organization", "name": "National Institute of Standards and Technology"}, "references": ["https://doi.org/10.1038/s41467-023-43367-z"], "theme": ["Chemistry:Analytical chemistry", "Environment:Greenhouse gas measurements", "Metrology:Optical, photometry, and laser metrology", "Physics:Optical physics", "Physics:Spectroscopy"], "title": "Mid-infrared supermirrors with finesse exceeding 400 000"}