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Real-time gas sensing based on optical feedback in a terahertz quantum-cascade laser

Hagelschuer, Till and Wienold, Martin and Richter, Heiko and Schrottke, Lutz and Grahn, H. T. and Hübers, Heinz-Wilhelm (2017) Real-time gas sensing based on optical feedback in a terahertz quantum-cascade laser. Optics Express, 25 (24), pp. 30203-30213. Optical Society of America. DOI: 10.1364/OE.25.030203 ISSN 1094-4087

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Official URL: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-24-30203


We report on real-time gas sensing with a terahertz quantum-cascade laser (QCL). The method is solely based on the modulation of the external cavity length, exploiting the intermediate optical feedback regime. While the QCL is operated in continuous-wave mode, optical feedback results in a change of the QCL frequency as well as its terminal voltage. The first effect is exploited to tune the lasing frequency across a molecular absorption line. The second effect is used for the detection of the self-mixing signal. This allows for fast measurement times on the order of 10 ms per spectrum and for real-time measurements of gas concentrations with a rate of 100 Hz. This technique is demonstrated with a mixture of D2O and CH3OD in an absorption cell.

Item URL in elib:https://elib.dlr.de/117884/
Document Type:Article
Title:Real-time gas sensing based on optical feedback in a terahertz quantum-cascade laser
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hagelschuer, TillTill.Hagelschuer (at) dlr.deUNSPECIFIED
Wienold, MartinMartin.Wienold (at) dlr.deUNSPECIFIED
Richter, HeikoHeiko.Richter (at) dlr.deUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Date:27 November 2017
Journal or Publication Title:Optics Express
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.1364/OE.25.030203
Page Range:pp. 30203-30213
Publisher:Optical Society of America
Keywords:quantum cascade lasers external optical feedback terahertz spectroscopy
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 Optische Fernerkundung für sicherheitsrelevante Anwendungen
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Hagelschuer, Till
Deposited On:08 Jan 2018 11:53
Last Modified:15 Jan 2019 11:30

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