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Submegahertz frequency stabilization of a terahertz quantum cascade laser to a molecular absorption line

Richter, Heiko and Pavlov, Sergei G. and Semenov, A. D. and Mahler, L. and Tredicucci, A. and Beere, H. E. and Ritchie, D. A. and Hübers, H.-W. (2010) Submegahertz frequency stabilization of a terahertz quantum cascade laser to a molecular absorption line. Applied Physics Letters, 96 (7), 071112-071112. DOI: [doi:10.1063/1.3324703].

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Abstract

The frequency of a terahertz quantum-cascade laser is stabilized to the absorption line of methanol gas at a frequency of 2.55 THz. The method is based on frequency modulation of the laser emissionm across the absorption line. The resulting derivativelike signal is used as an error signal for a control loop that keeps the laser frequency at maximum absorption. The unstabilized laser that is operated in a pulse tube cooler has frequency fluctuations of 15 MHz, which are reduced to 300 kHz with the control loop in action. The line shape of the locked signal is Gaussian.

Document Type:Article
Title:Submegahertz frequency stabilization of a terahertz quantum cascade laser to a molecular absorption line
Authors:
AuthorsInstitution or Email of Authors
Richter, HeikoHeiko.Richter@dlr.de
Pavlov, Sergei G.Sergeij.Pavlov@dlr.de
Semenov, A. D.Alexei.Semenov@dlr.de
Mahler, L.NEST CNR-INFM
Tredicucci, A.NEST CNR-INFM
Beere, H. E.University of Cambridge
Ritchie, D. A.University of Cambridge
Hübers, H.-W.Heinz-Wilhelm.Huebers@dlr.de
Date:19 February 2010
Journal or Publication Title:Applied Physics Letters
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:96
DOI:[doi:10.1063/1.3324703]
Page Range:071112-071112
Status:Published
Keywords:THz, QCL, stabilization, 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 - Projekt SOFIA (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Dr.rer.nat. Heiko Richter
Deposited On:07 Jan 2011 14:53
Last Modified:12 Dec 2013 21:06

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