Long path length cw-THz spectrometer using a multipass cell

Author

Hindle, Francis ; Yang, Chun ; Cuisset, Arnaud ; Mouret, Gael ; Bocquet, Robin

Author_Institution

Lab. de Physico-Chimie de l´´Atmos., Univ. du Littoral Cote d´´Opale, Dunkerque

fYear

2008

fDate

15-19 Sept. 2008

Firstpage

1

Lastpage

2

Abstract

Multipass cells have been extensively used in the infrared. Their use at THz frequencies is minimal due to the difficulty of coupling the highly divergent THz beams. The divergence of a cw-THz photomixing source was characterized and included in a beam propagation calculation to match the THz beam to a multipass cell. Path lengths up to 20 m have been realized. The spectra of carbonyl sulfide (OCS), vinyl chloride (CH₂CHCl) and dimethyl sulfoxide (DMSO), (CH₃)₂SO are used to demonstrate the improved sensitivity of the spectrometer.

Keywords

organic compounds; submillimetre wave propagation; terahertz wave spectra; THz beams; THz spectrometer; beam propagation; carbonyl sulfide; dimethyl sulfoxide; multipass cell; photomixing source; vinyl chloride; Apertures; Frequency measurement; Infrared spectra; Isotopes; Laser beams; Mirrors; Optical coupling; Samarium; Spectroscopy; Vibration measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter and Terahertz Waves, 2008. IRMMW-THz 2008. 33rd International Conference on

Conference_Location

Pasadena, CA

Print_ISBN

978-1-4244-2119-0

Electronic_ISBN

978-1-4244-2120-6

Type

conf

DOI

10.1109/ICIMW.2008.4665738

Filename

4665738