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High-resolution molecular spectroscopy with 2.5 THz quantum cascade lasers

Pavlov, Sergey and Hübers, Heinz-Wilhelm and Greiner-Bär, Michael and Richter, Heiko and Mahler, Lukas and Tredicucci, Alessandro and Beere, Harvey and Ritchie, David (2008) High-resolution molecular spectroscopy with 2.5 THz quantum cascade lasers. In: Proc. of the 1st International Workshop "THz Radiation: Basic Research and Applications", pp. 21-23. Institute of Electrical and Electronics Engineers. TERA 2008, [2008-10-02 - 2008-10-04], Alushta (Ukraine). ISBN 978-1-4244-2687-4.

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Abstract

Quantum cascade lasers operating at about 2.5 terahertz have been implemented in a spectrometer for high resolution molecular spectroscopy. Linewidth, frequency tunability and frequency stability of the lasers were investigated by mixing their radiation with radiation from a 2.5 terahertz gas laser. Two first laser characteristics were found to be sufficient for Doppler-limited spectroscopy. For a demonstration of the spectrometer, absorption at rotational transitions of methanol was measured. The cascade lasers served as radiation source. A gas laser was used to determine the absolute frequency simultaneously with the detection of absorption signal by mixing the gas laser radiation with a part of that from cascade lasers. Amplitude as well as frequency modulation of the output power of the cascade lasers was used. The pressure broadening and the pressure shift of a rotational transition of methanol at 2.519 terahertz were determined.

Document Type:Conference or Workshop Item (Speech)
Title:High-resolution molecular spectroscopy with 2.5 THz quantum cascade lasers
Authors:
AuthorsInstitution or Email of Authors
Pavlov, SergeyUNSPECIFIED
Hübers, Heinz-WilhelmUNSPECIFIED
Greiner-Bär, MichaelUNSPECIFIED
Richter, HeikoUNSPECIFIED
Mahler, LukasNEST CNR-INFM and Scuola Normale Superiore, Pisa, Italy
Tredicucci, AlessandroNEST CNR-INFM and Scuola Normale Superiore, Pisa, Italy
Beere, HarveyCavendish Laboratory, University of Cambridge, Cambridge, UK
Ritchie, DavidCavendish Laboratory, University of Cambridge, Cambridge, UK
Date:September 2008
Journal or Publication Title:Proc. of the 1st International Workshop "THz Radiation: Basic Research and Applications"
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 21-23
Publisher:Institute of Electrical and Electronics Engineers
ISBN:978-1-4244-2687-4
Status:Published
Keywords:high-resolution molecular spectroscopy, THz cascade lasers
Event Title:TERA 2008
Event Location:Alushta (Ukraine)
Event Type:international Conference
Event Dates:[2008-10-02 - 2008-10-04]
Organizer:IEEE Lasers and Electro-Optics Society (LEOS)
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 - Projekt SOFIA (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Dr. Sergey Pavlov
Deposited On:25 Nov 2008
Last Modified:15 Jan 2010 00:21

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