Titel
Mid-infrared supermirrors with finesse exceeding 400 000
Autor*in
Gar-Wing Truong
Thorlabs Crystalline Solutions
Autor*in
D. Michelle Bailey
National Institute of Standards and Technology, USA
... show all
Abstract
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 µm, 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.
Stichwort
Infrared spectroscopyMaterials for opticsOptical materials and structures
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
https://phaidra.univie.ac.at/o:2069152
Erschienen in
Titel
Nature Communications
Band
14
ISSN
2041-1723
Erscheinungsdatum
2023
Verlag
Springer Science and Business Media LLC
Projektnummer
P 36040 – Austrian Science Fund (FWF)
Erscheinungsdatum
2023
Zugänglichkeit
Rechteangabe
© The Author(s) 2023

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