Regularization of vertical-cavity surface-emitting laser emission by periodic non-Hermitian potentials
We propose a novel physical mechanism based on periodicnon-Hermitian potentials to efficiently control the complexspatial dynamics of broad-area lasers, particularly in vertical-cavity surface-emitting lasers (VCSELs), achieving a stableemission of maximum brightness. A radially dephased peri-odic r...
| Authors: | , , , , |
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| Format: | article |
| Publication Date: | 2019 |
| Country: | España |
| Institution: | Universitat Politècnica de Catalunya (UPC) |
| Repository: | UPCommons. Portal del coneixement obert de la UPC |
| Language: | English |
| OAI Identifier: | oai:upcommons.upc.edu:2117/171375 |
| Online Access: | https://hdl.handle.net/2117/171375 https://dx.doi.org/10.1364/OL.44.003948 |
| Access Level: | Open access |
| Keyword: | Semiconductor lasers Làsers de semiconductors Àrees temàtiques de la UPC::Física |
| Summary: | We propose a novel physical mechanism based on periodicnon-Hermitian potentials to efficiently control the complexspatial dynamics of broad-area lasers, particularly in vertical-cavity surface-emitting lasers (VCSELs), achieving a stableemission of maximum brightness. A radially dephased peri-odic refractive index and gain-loss modulations accumulatethe generated light from the entire active layer and concen-trate it around the structure axis to emit narrow, brightbeams. The effect is due to asymmetric inward radial cou-pling between transverse wave vectors for particular phasedifferences of the refractive index and gain-loss modulations.Light is confined into a central beam with large intensity,opening the path to design compact, bright, and efficientbroad-area light sources. We perform a comprehensive analy-sis to explore the maximum central intensity enhancement andconcentration regimes. This Letter reveals that the optimumschemes are those holding unidirectional inward coupling,but not fulfilling a perfect local PT-symmetry. |
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