Figure-of-merit analysis of distributed sidewall loss method to suppress high-order modes in broad area quantum cascade lasers

We have modeled broad-area ridge-waveguide quantum cascade lasers (QCLs) using COMSOL and generated a rank-ordering of high-order transverse lateral modes as a function of cavity width on the basis of a figure-of-merit. In particular, we corroborate experimental results previously obtained using the...

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Bibliographic Details
Published in:AIP advances 2020-07, Vol.10 (7), p.075011-075011-5
Main Authors: Kaspi, Ron, Suttinger, Matthew
Format: Article
Language:English
Subjects:
Quantum cascade lasers
Waveguides
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Summary:We have modeled broad-area ridge-waveguide quantum cascade lasers (QCLs) using COMSOL and generated a rank-ordering of high-order transverse lateral modes as a function of cavity width on the basis of a figure-of-merit. In particular, we corroborate experimental results previously obtained using the distributed sidewall loss (DSL) method to suppress high-order transverse lateral modes and extract fundamental mode in broad-area QCLs. COMSOL modeling shows that waveguide losses preferentially incurred by the high-order modes, due to the direct sidewall contact with metal as prescribed by the DSL method, can be used to obtain single-lobed emission with enhanced brightness in broad-area QCLs.
ISSN:2158-3226
2158-3226
DOI:10.1063/5.0016127