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Molecular Spectroscopy with TeraHertz Quantum Cascade Lasers

Hübers, Heinz-Wilhelm and Pavlov, S.G. and Richter, H. and Semenov, A. and Mahler, L. and Tredicucci, A. and Beere, H.E. and Ritchie, D.A. (2007) Molecular Spectroscopy with TeraHertz Quantum Cascade Lasers. Journal of Nanoelectronics and Optoelectronics, 2 (1), pp. 101-107. American Scientific Publishers. DOI: 10.1166/jno.2007.010

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Abstract

We have implemented quantum cascade lasers (QCLs) operating at about 2.5 THz in a spectrometer for high resolution molecular spectroscopy. One QCL has a Fabry-Perot resonator while the other is a distributed feedback laser. Linewidth and frequency tunability of both QCLs were investigated by mixing the radiation from the QCL with that from a 2.5 THz gas laser. Both were found sufficient for Doppler limited spectroscopy. Rotational tranistions of methanol were detected in absorption using a QCL as radiation source. Amplitude as well as frequency modulation of the output power of the QCL were used. The absolute frequency was determined simultaneously with the absorption signal by mixing a small part of the radiation from the QCL with that from a gas laser. The pressure broadening and the pressure shift of a rotational transition of methanol at 2.519 THz were measured in order to demonstrate the performance of the spectrometer.

Item URL in elib:https://elib.dlr.de/48285/
Document Type:Article
Title:Molecular Spectroscopy with TeraHertz Quantum Cascade Lasers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hübers, Heinz-WilhelmUNSPECIFIEDUNSPECIFIED
Pavlov, S.G.UNSPECIFIEDUNSPECIFIED
Richter, H.UNSPECIFIEDUNSPECIFIED
Semenov, A.UNSPECIFIEDUNSPECIFIED
Mahler, L.UNSPECIFIEDUNSPECIFIED
Tredicucci, A.UNSPECIFIEDUNSPECIFIED
Beere, H.E.UNSPECIFIEDUNSPECIFIED
Ritchie, D.A.UNSPECIFIEDUNSPECIFIED
Date:1 April 2007
Journal or Publication Title:Journal of Nanoelectronics and Optoelectronics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:2
DOI :10.1166/jno.2007.010
Page Range:pp. 101-107
Publisher:American Scientific Publishers
Status:Published
Keywords:Terahertz, Quantum Cascade Laser, High Resolution, Spectroscopy
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - no assignment (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Hübers, Dr. Heinz-Wilhelm
Deposited On:27 Jul 2007
Last Modified:27 Apr 2009 13:45

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