Terahertz multiheterodyne spectroscopy using laser frequency combs
Name
Terahertz multi.pdf
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889.87 KB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Hayton, Darren J.
Gao, Jian-Rong
Reno, John L.
Yang, Yang
Burghoff, David Patrick
Hu, Qing
Date Issued
May 2016
Journal
Optica
Publisher
Optical Society of America
Citation
Yang, Yang et al. “Terahertz Multiheterodyne Spectroscopy Using Laser Frequency Combs.” Optica 3, 5 (May 2016): 499-502 © 2016 Optical Society of America
Version
Author's final manuscript
Abstract
The terahertz region is of great importance for spectroscopy since many molecules have absorption fingerprints there. Frequency combs based on terahertz quantum cascade lasers feature broadband coverage and high output powers in a compact package, making them an attractive option for broadband spectroscopy. Here, we demonstrate the first multiheterodyne spectroscopy using two terahertz quantum cascade laser combs. Over a spectral range of 250 GHz, we achieve average signal-to-noise ratios of 34 dB using cryogenic detectors and 24 dB using room-temperature detectors, all in just 100 μs. As a proof of principle, we use these combs to measure the broadband transmission spectrum of etalon samples and show that, with proper signal processing, it is possible to extend the multiheterodyne spectroscopy to quantum cascade laser combs operating in pulsed mode. This greatly expands the range of quantum cascade lasers that could be suitable for these techniques and allows for the creation of completely solid-state terahertz laser spectrometers.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1364/optica.3.000499
