Eichholz, René und Richter, Heiko und Greiner-Bär, Michael und Pavlov, Sergey und Wienold, Martin und Schrottke, L. und Giehler, M. und Hey, R. und Grahn, H.T. und Hübers, Heinz-Wilhelm (2012) Broadband molecular spectroscopy with a multi-mode THz quantum cascade laser (QCL). IQCLSW 2012, 2012-09-02 - 2012-09-06, Baden bei Wien (Österreich).
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Kurzfassung
High-resolution molecular spectroscopy is a powerful tool for investigations of the structure and energy levels of molecules and atoms. In addition to the scientific interest, terahertz (THz) spectroscopy is also of interest for the detection and identification of gases in safety and security applications. While for frequencies below 2 THz many different methods have been developed, spectroscopy above 2 THz is hampered by the lack of frequency-tunable, continuous-wave, powerful, and narrow-linewidth radiation sources. For this frequency range, THz quantum-cascade lasers (QCLs) are promising radiation sources. We report on a THz absorption spectrometer, which combines a grating monochromator, a QCL, and a microbolometer camera. The QCL used in these experiments contains a single-plasmon waveguide and a Fabry-Pérot cavity with both facets uncoated. It is optimized for low electrical pumping powers an emits several modes centered around 3.4 THz. The laser is mounted in a compact air-cooled cryocooler (model K535 from Ricor). The emitted beam is focused with a TPX lens and guided through a 27 cm long absorption cell onto the monochromator, which spectrally resolves the laser modes. The modes are imaged onto the microbolometer camera. The absorption spectrum of methanol around 3.4 THz is measured by detecting simultaneously the signal of each of the laser modes as a function of the laser driving current. By this means, frequency multiplexing is achieved.
elib-URL des Eintrags: | https://elib.dlr.de/78029/ | ||||||||||||||||||||||||||||||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||||||||||||||||||||||||||||||
Titel: | Broadband molecular spectroscopy with a multi-mode THz quantum cascade laser (QCL) | ||||||||||||||||||||||||||||||||||||||||||||
Autoren: |
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Datum: | 6 September 2012 | ||||||||||||||||||||||||||||||||||||||||||||
Open Access: | Ja | ||||||||||||||||||||||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||||||||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||||||||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||||||||||||||||||
Stichwörter: | QCL, quantum-cascade laser, Quantenkaskadenlaser, microbolometer array, Mikrobolometerkamera, THz, terahertz absorption spectrometer, spectroscopy | ||||||||||||||||||||||||||||||||||||||||||||
Veranstaltungstitel: | IQCLSW 2012 | ||||||||||||||||||||||||||||||||||||||||||||
Veranstaltungsort: | Baden bei Wien (Österreich) | ||||||||||||||||||||||||||||||||||||||||||||
Veranstaltungsart: | Workshop | ||||||||||||||||||||||||||||||||||||||||||||
Veranstaltungsbeginn: | 2 September 2012 | ||||||||||||||||||||||||||||||||||||||||||||
Veranstaltungsende: | 6 September 2012 | ||||||||||||||||||||||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||||||||||||||||||||||
HGF - Programm: | Verkehr | ||||||||||||||||||||||||||||||||||||||||||||
HGF - Programmthema: | Verkehrsmanagement (alt) | ||||||||||||||||||||||||||||||||||||||||||||
DLR - Schwerpunkt: | Verkehr | ||||||||||||||||||||||||||||||||||||||||||||
DLR - Forschungsgebiet: | V VM - Verkehrsmanagement | ||||||||||||||||||||||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | V - Projekt FAMOUS 2 (alt) | ||||||||||||||||||||||||||||||||||||||||||||
Standort: | Berlin-Adlershof | ||||||||||||||||||||||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Planetenforschung > Experimentelle Planetenphysik | ||||||||||||||||||||||||||||||||||||||||||||
Hinterlegt von: | Eichholz, René | ||||||||||||||||||||||||||||||||||||||||||||
Hinterlegt am: | 29 Okt 2012 10:42 | ||||||||||||||||||||||||||||||||||||||||||||
Letzte Änderung: | 24 Apr 2024 19:44 |
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