University of Illinois Urbana-Champaign

QUANTUM CASCADE LASER PUMPING FOR MOLECULAR LASING AND SPECTROSCOPY

Chevalier, Paul

Content Files
6690.pdf
TD02_1.pptx

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https://hdl.handle.net/2142/122308

Description

Title
QUANTUM CASCADE LASER PUMPING FOR MOLECULAR LASING AND SPECTROSCOPY
Author(s)
Chevalier, Paul
Contributor(s)
  • Everitt, Henry O.
  • Capasso, Federico
  • Amirzhan, Arman
Issue Date
2023-06-20
Keyword(s)
Instrument/Technique Demonstration
Abstract
The lack of powerful and tunable sources in the terahertz frequency (100 GHz to 10 THz) can limit the accuracy and resolution of rotational molecular spectroscopy. While the ground state rotational spectrum of molecules is easily measured, thanks to the large thermal population of lower rotational levels at room temperature, measuring the rotational spectra in sparsely populated excited vibrational states can be much harder. Unlike molecular infrared lasers, quantum cascade lasers offer continuous tunabilty across the ro-vibrational transitions of most molecules. Here, we exploit this tunability to demonstrate a new type of laser and a new type of spectroscopy. Pumping molecules using a quantum cascade laser dramatically enhances the population of sparsely populated vibrational states, and the resulting enhancement of their rotational absorption or emission lines enables the direct measurement of their otherwise weak spectra. In some molecules, this pumping even exceeds the lasing threshold, and every line in the rotational spectrum may be made to lase.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/122308
DOI
https://doi.org/10.15278/isms.2023.6690

Owning Collections

Abstracts & Presentations - 2023 International Symposium on Molecular Spectroscopy PRIMARY