Gain and losses in THz quantum cascade laser with metal-metal waveguide

Coupling of broadband terahertz pulses into metal-metal terahertz quantum cascade lasers is presented. Mode matched terahertz transients are generated on the quantum cascade laser facet of subwavelength dimension. This method provides a full overlap of optical mode and active laser medium. A longitu...

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Bibliographic Details
Published inOptics express Vol. 19; no. 2; pp. 733 - 738
Main Authors Martl, Michael, Darmo, Juraj, Deutsch, Christoph, Brandstetter, Martin, Andrews, Aaron Maxwell, Klang, Pavel, Strasser, Gottfried, Unterrainer, Karl
Format Journal Article
LanguageEnglish
Published United States 17.01.2011
Subjects
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Lasers
Metals - chemistry
Refractometry - instrumentation
Terahertz Radiation
Transducers
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Summary:Coupling of broadband terahertz pulses into metal-metal terahertz quantum cascade lasers is presented. Mode matched terahertz transients are generated on the quantum cascade laser facet of subwavelength dimension. This method provides a full overlap of optical mode and active laser medium. A longitudinal optical-phonon depletion based active region design is investigated in a coupled cavity configuration. Modulation experiments reveal spectral gain and (broadband) losses. The observed gain shows high dynamic behavior when switching from loss to gain around threshold and is clamped at total laser losses.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.19.000733