Spectroscopy in the gas phase with GaAs/AlGaAs quantum-cascade lasers

Lubos Hvozdara, Stefan Gianordoli, Gottfried Strasser, Werner Schrenk, Karl Unterrainer, Erich Gornik, Chavali S.S.S. Murthy, Martin Kraft, Viktor Pustogow, Boris Mizaikoff, Alexandra Inberg, Nathan Croitoru

Research output: Contribution to journalArticlepeer-review


We demonstrate what we believe is the first application of the recently developed electrically pumped GaAs/AlGaAs quantum-cascade lasers in a spectroscopic gas-sensing system by use of hollow waveguides. Laser light with an emission maximum at 10.009 mm is used to investigate the midinfrared absorption of ethene at atmospheric pressure. We used a 434-μm-long silver-coated silica hollow waveguide as a sensing element, which served as a gas absorption cell. Different mixtures of helium and ethene with known concentrations are flushed through the waveguide while the laser radiation that passes through the waveguide is analyzed with a Fourier-transform infrared spectrometer. The experimentally obtained discrete ethene spectrum agrees well with the calculated spectrum. A detection threshold of 250 parts per million is achieved with the current setup.

Original languageEnglish
Pages (from-to)6926-6930
Number of pages5
JournalApplied Optics
Issue number36
StatePublished - 20 Dec 2000


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