An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Chirped-pulse terahertz spectroscopy for broadband trace gas sensing
Published
Author(s)
Eyal Gerecht, Kevin O. Douglass, David F. Plusquellic
Abstract
We report the first demonstration of a broadband trace gas sensor based on chirp-pulse terahertz spectroscopy. The advent of newly developed solid state sources and heterodyne detectors for the terahertz frequency range have made it possible to generate and detect precise arbitrary waveforms at THz frequencies with ultra-low phase noise. In order to maximize sensitivity, the sample gas is first polarized using a sub-μsec chirped THz pulse and the free inductive decay (FID) is detected using a heterodyne receiver. This approach allows for a rapid broadband multi-component sensing with parts-per-billion sensitivity at a spectral resolution of
Gerecht, E.
, Douglass, K.
and Plusquellic, D.
(2011),
Chirped-pulse terahertz spectroscopy for broadband trace gas sensing, Optics Express, [online], https://doi.org/10.1364/OE.19.008973
(Accessed June 6, 2023)