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High-spectral-resolution terahertz imaging with a quantum-cascade laser

Hagelschuer, Till and Rothbart, Nick and Richter, Heiko and Wienold, Martin and Schrottke, Lutz and Grahn, H.T. and Hübers, Heinz-Wilhelm (2016) High-spectral-resolution terahertz imaging with a quantum-cascade laser. Optics Express. Optical Society of America. ISSN 1094-4087

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We report on a high-spectral-resolution terahertz imaging system operating with a multi-mode quantum-cascade laser (QCL), a fast scanning mirror, and a sensitive Ge:Ga detector. By tuning the frequency of the QCL, several spectra can be recorded in 1.5 s during the scan through a gas cell filled with methanol (CH3OH). These experiments yield information about the local absorption and the linewidth. Measurements with a faster frame rate of up to 3 Hz allow for the dynamic observation of CH3OH gas leaking from a terahertz-transparent tube into the evacuated cell. In addition to the relative absorption, the local pressure is mapped by exploiting the effect of pressure broadening.

Item URL in elib:https://elib.dlr.de/105696/
Document Type:Article
Title:High-spectral-resolution terahertz imaging with a quantum-cascade laser
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hagelschuer, TillTill.Hagelschuer (at) dlr.deUNSPECIFIED
Rothbart, NickNick.Rothbart (at) dlr.deUNSPECIFIED
Richter, HeikoHeiko.Richter (at) dlr.deUNSPECIFIED
Wienold, MartinMartin.Wienold (at) dlr.deUNSPECIFIED
Schrottke, LutzPaul-Drude-Institut für Festkörperelektronik, Berlin, GermanyUNSPECIFIED
Grahn, H.T.Paul-Drude-Institut für Festkörperelektronik, Berlin, GermanyUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Date:27 June 2016
Journal or Publication Title:Optics Express
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Publisher:Optical Society of America
Keywords:Terahertz Spectroscopy Terahertz Imaging Quantum-Cascade Lasers
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben IR-Sensorik, IR-Missionsprojekte
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems
Deposited By: Hagelschuer, Till
Deposited On:12 Aug 2016 11:29
Last Modified:15 Jan 2019 11:30

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