Abstract
AbstractFor 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.
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary
Reference40 articles.
1. Rempe, G., Lalezari, R., Thompson, R. J. & Kimble, H. J. Measurement of ultralow losses in an optical interferometer. Opt. Lett. 17, 363 (1992).
2. Jin, N. et al. Micro-fabricated mirrors with finesse exceeding one million. Optica 9, 965–970 (2022).
3. McLemore, C. A. et al. Thermal noise-limited laser stabilization to an 8 mL volume Fabry-Perot reference cavity with microfabricated mirrors. Preprint at https://arxiv.org/abs/2203.15915 (2022).
4. Delli Santi, M. G. et al. Biogenic fraction determination in fuel blends by laser-based 14CO2 detection. Adv. Photonics Res. 2, 2000069 (2021).
5. Fleisher, A. J., Long, D. A., Liu, Q., Gameson, L. & Hodges, J. T. Optical measurement of radiocarbon below unity fraction modern by linear absorption spectroscopy. J. Phys. Chem. Lett. 8, 4550–4556 (2017).
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献