@article{27f474cca7744c0ca4eb8ab164af5d4e,
title = "Terahertz Spectroscopy of Gas Mixtures with Dual Quantum Cascade Laser Frequency Combs",
abstract = "Terahertz laser frequency combs based on quantum cascade lasers provide coherent, broadband, electrically pumped, THz radiation sources for use in future spectroscopic applications. Here, we explore the feasibility of such lasers in a dual-comb spectroscopy configuration for the detection of multiple molecular samples in the gas phase. The lasers span approximately 180 GHz of optical bandwidth, centered at 3.4 THz, with submilliwatt total optical power. One of the main advantages of dual-comb spectroscopy is its high speed, which opens up the possibility for direct observations of chemical reaction dynamics in the terahertz spectral region. As a proof-of-concept, we recorded continuously evolving spectra from gas mixtures with 1 ms temporal resolution. ",
keywords = "dual-comb spectroscopy, frequency comb, multispecies, quantum cascade laser, real-time, terahertz",
author = "Sterczewski, {Lukasz A.} and Jonas Westberg and Yang Yang and David Burghoff and John Reno and Qing Hu and Gerard Wysocki",
note = "Funding Information: The authors would like to acknowledge William H. Dix for his help with the laser submounts. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the DARPA, the U.S. Army, or the U.S. Government. The work in this research article was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy{\textquoteright}s National Nuclear Security Administration. Funding Information: Defense Advanced Research Projects Agency (DARPA) (W31P4Q-16-1-0001 and HR00111920006); Kosciuszko Foundation (KF; Kosciuszko Foundation Grant); Foundation for Polish Science (FNP; START 085.2018); Thorlabs Inc.; Aviation and Missile Research, Development, and Engineering Center (AMRDEC); U.S. Department of Energy (DOE); Sandia National Laboratories National Technology and Engineering Solutions of Sandia; DOE National Nuclear Security Administration (NNSA; DE-NA-0003525). Funding Information: Defense Advanced Research Projects Agency (DARPA) (W31P4Q-16-1-0001 and HR00111920006); Kosciuszko Foundation (KF; Kosciuszko Foundation Grant); Foundation for Polish Science (FNP; START 085.2018); Thorlabs Inc.; Aviation and Missile Research, Development and Engineering Center (AMRDEC); U.S. Department of Energy (DOE); Sandia National Laboratories National Technology and Engineering Solutions of Sandia; DOE National Nuclear Security Administration (NNSA; DE-NA-0003525). Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society.",
year = "2020",
month = may,
day = "20",
doi = "10.1021/acsphotonics.9b01758",
language = "English (US)",
volume = "7",
pages = "1082--1087",
journal = "ACS Photonics",
issn = "2330-4022",
publisher = "American Chemical Society",
number = "5",
}