Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference

Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference

The far-field distribution of the emission intensity of terahertz (THz) quantum-cascade lasers (QCLs) frequently exhibits multiple lobes instead of a single-lobed Gaussian distribution. We show that such multiple lobes can result from self-interference related to the typically large beam divergence...

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Main Authors: B. Röben, M. Wienold, L. Schrottke, H. T. Grahn
Format: Article
Language:English
Published: AIP Publishing LLC 2016-06-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/1.4953596
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spelling doaj-4705667e140c43dcbb338ba9ee14ebc72020-11-24T21:14:27ZengAIP Publishing LLCAIP Advances2158-32262016-06-0166065104065104-610.1063/1.4953596014606ADVMultiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interferenceB. Röben0M. Wienold1L. Schrottke2H. T. Grahn3 Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e. V., Hausvogteiplatz 5–7, 10117 Berlin, Germany Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e. V., Hausvogteiplatz 5–7, 10117 Berlin, Germany Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e. V., Hausvogteiplatz 5–7, 10117 Berlin, Germany Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e. V., Hausvogteiplatz 5–7, 10117 Berlin, GermanyThe far-field distribution of the emission intensity of terahertz (THz) quantum-cascade lasers (QCLs) frequently exhibits multiple lobes instead of a single-lobed Gaussian distribution. We show that such multiple lobes can result from self-interference related to the typically large beam divergence of THz QCLs and the presence of an inevitable cryogenic operation environment including optical windows. We develop a quantitative model to reproduce the multiple lobes. We also demonstrate how a single-lobed far-field distribution can be achieved.http://dx.doi.org/10.1063/1.4953596
collection DOAJ
language English
format Article
sources DOAJ
author B. Röben
M. Wienold
L. Schrottke
H. T. Grahn
spellingShingle B. Röben
M. Wienold
L. Schrottke
H. T. Grahn
Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference
AIP Advances
author_facet B. Röben
M. Wienold
L. Schrottke
H. T. Grahn
author_sort B. Röben
title Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference
title_short Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference
title_full Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference
title_fullStr Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference
title_full_unstemmed Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference
title_sort multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference
publisher AIP Publishing LLC
series AIP Advances
issn 2158-3226
publishDate 2016-06-01
description The far-field distribution of the emission intensity of terahertz (THz) quantum-cascade lasers (QCLs) frequently exhibits multiple lobes instead of a single-lobed Gaussian distribution. We show that such multiple lobes can result from self-interference related to the typically large beam divergence of THz QCLs and the presence of an inevitable cryogenic operation environment including optical windows. We develop a quantitative model to reproduce the multiple lobes. We also demonstrate how a single-lobed far-field distribution can be achieved.
url http://dx.doi.org/10.1063/1.4953596
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AT mwienold multiplelobesinthefarfielddistributionofterahertzquantumcascadelasersduetoselfinterference
AT lschrottke multiplelobesinthefarfielddistributionofterahertzquantumcascadelasersduetoselfinterference
AT htgrahn multiplelobesinthefarfielddistributionofterahertzquantumcascadelasersduetoselfinterference
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