University of Illinois Urbana-Champaign

An Heterodyne Spectrometer For Terahertz Spectroscopy

Mammez, Dominique

Content Files
5498.pdf
TI03_5498.pdf

Permalink

https://hdl.handle.net/2142/111295

Description

Title
An Heterodyne Spectrometer For Terahertz Spectroscopy
Author(s)
Mammez, Dominique
Contributor(s)
  • Lampin, Jean-François
  • Eliet, Sophie
  • Pirali, Olivier
  • Martin-Drumel, Marie-Aline
  • Hearne, Thomas Sandow
  • Mouret, Gaël
  • Hindle, Francis
  • Mammez, Marie-Hélène
Issue Date
2021-06-22
Keyword(s)
Instrument/Technique Demonstration
Date of Ingest
  • 2021-09-24T21:09:27Z
  • 2022-01-21T16:10:49Z
Abstract
The Terahertz (THz) region of the electromagnetic spectrum between the infrared to the microwave domains (0.1 – 10 THz) is often referred to as the “THz gap”. Nevertheless, it has become widely accessible over the last decades by different sources, particularly with multiplication chains. In this context, the HEROES consortium has developed a heterodyne spectrometer based on a far-infrared (FIR) molecular laser pumped by a mid-infrared (MIR) quantum cascade laser (QCL) to address this spectral domain \footnote{Lampin, J.-F. et al. Opt. Lett. (2019) 44, 20}\textsuperscript{,}\footnote{Pagies, A. et al. APL Photonics (2016) 1, 031302}. We present here a laboratory setup mixing on a hot electron bolometer (HEB) the FIR emission from the QCL-pumped molecular laser with a blackbody radiation transmitted by an single-path cell filled with a few $\mu$\textit{bar} of the gaz under investigation. This setup enables to perform high resolution spectroscopy of rotational transitions of small molecules between 1 THz and 3.37 THz with a 5 GHz bandwidth and 80 kHz resolution. We will demonstrate these performances through absorption spectra of methanol at 1 THz and 2 THz along with emission spectra against a cold bakground of methanol and CD$_{3}$OD.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/111295
DOI
10.15278/isms.2021.TI03

Owning Collections

Abstracts & Presentations - 2021 International Symposium on Molecular Spectroscopy PRIMARY