Gas Messzelle

Gas molecules have intra-molecular movements such as vibrational, rotational and translational motions, which absorbs energy in the THz frequency range. Another reason to use THz radiation for gas sensing is that it is non-invasive and non-ionizing, which provides application potentials in sensitive industrial environments. We build a continuous wave THz gas sensing system which implements a Y-DBR two-color laser (a MOPA laser from FBH) for coherent generation and detection of THz waves, and a multipass gas cell made of stainless steel for gas measurements. The difference frequency from the two-color emission can be tuned either by current or by temperature. With water vapor as out first gas sample, we demonstrated a water absorption line near 557 GHz, which corresponds to the transition lines provided by the HITRAN database. Further research is being carried on to further improve the resolution and measurement speed for fulfilling the industrial requirements.


  • Yinghui Hu, Nils Surkamp, Carsten Brenner, Lisa Kreuzer, André Müller, Martin Maiwald, Bernd Sumpf and Martin R. Hofmann, „A Compact CW THz Gas Sensing System Based On A Dual-Wavelength MOPA Laser“,  presented at the 11th International Workshop on Terahertz Technology and Applications, Kaiserslautern, Mar. 12-13, 2024



Ruhr-Universität Bochum
Fakultät für Elektrotechnik und Informationstechnik
Lehrstuhl für Photonik und Terahertztechnologie
Postfach ID 16
Universitätsstraße 150
D-44801 Bochum


Raum: ID 04/327
Telefon: (+49) (0) 234 32 - 23051
Fax: (+49) (0) 234 32 - 14167 
E-Mail: ptt+office(at)rub.de
RUB  LageplanAnreise


Prof. Dr.-Ing. Martin Hofmann
Raum: ID 04/329
Te­le­fon: (+49) (0) 234 32 - 22259
Fax: (+49) (0) 234 32 - 14167
E-Mail: martin.hofmann(at)rub.de

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