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Wideband, high-resolution terahertz spectroscopy by light-induced frequency tuning of quantum-cascade lasers

Alam, Tasmim and Wienold, Martin and Lü, Xiang and Biermann, Klaus and Schrottke, Lutz and Grahn, Holger T. and Hübers, Heinz-Wilhelm (2019) Wideband, high-resolution terahertz spectroscopy by light-induced frequency tuning of quantum-cascade lasers. Optics Express, 27 (4), pp. 5420-5432. Optical Society of America. DOI: 10.1364/OE.27.005420 ISSN 1094-4087

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Official URL: https://doi.org/10.1364/OE.27.005420

Abstract

Near-infrared optical excitation enables wideband requency tuning of terahertz quantum-cascade lasers. In this work, we demonstrate the feasibility of the approach for molecular laser absorption spectroscopy. We present a physical model which explains the observed frequency tuning characteristics by the optical excitation of an electron-hole plasma. Due to an improved excitation configuration as compared to previous work, we observe a single-mode continuous-wave frequency coverage of as much as 40 GHz for a laser at 3.1 THz. This represents, for the same device, a ten-fold improvement over the usually employed tuning by current. The method can be readily applied to a large class of devices.

Item URL in elib:https://elib.dlr.de/126573/
Document Type:Article
Title:Wideband, high-resolution terahertz spectroscopy by light-induced frequency tuning of quantum-cascade lasers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Alam, Tasmimtasmim.alam (at) dlr.deUNSPECIFIED
Wienold, MartinMartin.Wienold (at) dlr.deUNSPECIFIED
Lü, XiangPDIUNSPECIFIED
Biermann, KlausPDIUNSPECIFIED
Schrottke, LutzPDIUNSPECIFIED
Grahn, Holger T.PDIUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Date:18 February 2019
Journal or Publication Title:Optics Express
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:27
DOI :10.1364/OE.27.005420
Page Range:pp. 5420-5432
Publisher:Optical Society of America
ISSN:1094-4087
Status:Published
Keywords:Quantenkaskadenlaser, Terahertz-Spektroskopie
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Wienold, Martin
Deposited On:21 Feb 2019 08:09
Last Modified:21 Feb 2019 08:09

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