Spatial mode dynamics in wide-aperture quantum-dot lasers

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dc.contributor.authorMukherjee, Jayanta
dc.contributor.authorMcInerney, John G.
dc.contributor.funderScience Foundation Ireland
dc.date.accessioned2017-08-25T10:08:52Z
dc.date.available2017-08-25T10:08:52Z
dc.date.issued2009
dc.description.abstractWe present a systematic theoretical study of spatial mode dynamics in wide-aperture semiconductor quantum-dot lasers within the Maxwell-Bloch formalism. Our opto-electro-thermal model self-consistently captures the essential dynamical coupling between field, polarization, and carrier density in both thermal and nonthermal regimes, providing detailed description of the complex spatiotemporal modal intensity structure and spectra in these novel devices and broad area edge-emitting lasers in general. Using linear stability analysis and high resolution adaptive-grid finite element numerical simulation, we show that in the nonthermal regime, the presence of inhomogeneous broadening in quantum-dot active media leads to suppressed filamentation and enhanced spatial coherence compared to conventional quantum well devices with comparable phase-amplitude coupling (alpha parameter). Increasing the degree of inhomogeneous broadening in the active medium leads to further improvement in spatial coherence. In the thermal regime, there is further suppression of filamentation in the inhomogeneously broadened quantum-dot active medium; however, the spatial coherence aided by inhomogeneous broadening is partly lost due to the effect of temperature on cavity detuning. We propose that device designs based on optimized inhomogeneous broadening of quantum-dot gain medium could ultimately lead to diffraction-limited outputs in the quasi-cw regime which are still very difficult to achieve in conventional wide-aperture designs.en
dc.description.sponsorshipScience Foundation Ireland (04/BR/P0701)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid53813
dc.identifier.citationMukherjee, J. and McInerney, J. G. (2009) 'Spatial mode dynamics in wide-aperture quantum-dot lasers', Physical Review A, 79(5), 053813 (15pp). doi: 10.1103/PhysRevA.79.053813en
dc.identifier.doi10.1103/PhysRevA.79.053813
dc.identifier.issn2469-9926
dc.identifier.issn2469-9934
dc.identifier.issued5
dc.identifier.journaltitlePhysical Review Aen
dc.identifier.urihttps://hdl.handle.net/10468/4536
dc.identifier.volume79
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.urihttps://journals.aps.org/pra/abstract/10.1103/PhysRevA.79.053813
dc.rights© 2009, American Physical Societyen
dc.subjectLinewidth enhancement factoren
dc.subjectArea semiconductor lasersen
dc.subjectInhomogeneously broadened laseren
dc.subjectSpatiotemporal dynamicsen
dc.subjectMicroscopic physicsen
dc.subjectNonlinear dynamicsen
dc.subjectTransverse sectionen
dc.subjectOptical feedbacken
dc.subjectBloch equationsen
dc.subjectDiode-lasersen
dc.titleSpatial mode dynamics in wide-aperture quantum-dot lasersen
dc.typeArticle (peer-reviewed)en
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