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Frequency modulation spectroscopy with a terahertz quantum-cascade laser

Eichholz, René and Richter, Heiko and Wienold, Martin and Schrottke, Lutz and Grahn, H. T. and Hübers, Heinz-Wilhelm (2014) Frequency modulation spectroscopy with a terahertz quantum-cascade laser. 6th International Workshop on THz Technology and Applications, 11.-12. März 2014, Kaiserslautern.

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[img] PDF (Abstract)
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Abstract

Many physical phenomena have characteristic energies, which correspond to terahertz (THz) frequencies. For example, high-resolution spectroscopy allows for the investigation of the structure and the energy levels of molecules and atoms. THz quantum-cascade lasers (QCLs) are promising radiation sources for such a type of spectroscopy, because they are frequency tunable, and they exhibit mW output powers as well as a narrow line width. So far, absorption spectroscopy with QCLs employed modulation of the QCL frequency on the order of kHz and phase-sensitive detection (1). We describe a spectrometer based on a QCL using frequency modulation (FM) spectroscopy with frequencies up to 50 MHz. The condition for FM spectroscopy is achieved when the modulation frequency is large compared to a characteristic width of the spectral feature of interest and only one sideband probes the spectral feature. Potentially, the method is very sensitive, because the modulation frequency is well above the frequencies of the most important noise sources (2).

Item URL in elib:https://elib.dlr.de/94009/
Document Type:Conference or Workshop Item (Poster)
Title:Frequency modulation spectroscopy with a terahertz quantum-cascade laser
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Eichholz, Renérene.eichholz (at) dlr.deUNSPECIFIED
Richter, HeikoHeiko.Richter (at) dlr.deUNSPECIFIED
Wienold, MartinPDIUNSPECIFIED
Schrottke, LutzPDIUNSPECIFIED
Grahn, H. T.PDIUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Date:2014
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:THz terahertz QCL quantum cascade laser spectroscopy frequency modulation
Event Title:6th International Workshop on THz Technology and Applications
Event Location:Kaiserslautern
Event Type:international Conference
Event Dates:11.-12. März 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Traffic Management (old)
DLR - Research area:Transport
DLR - Program:V VM - Verkehrsmanagement
DLR - Research theme (Project):V - Optimode (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: Eichholz, René
Deposited On:05 Jan 2015 13:58
Last Modified:31 Jul 2019 19:50

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