Multimode Emission in GaN Microdisk Lasers

Author:

Drechsler Monty L.1ORCID,Choi Luca Sung‐Min2,Tabataba‐Vakili Farsane34,Nippert Felix2,Koulas‐Simos Aris2,Lorke Michael1,Reitzenstein Stephan2,Alloing Blandine5,Boucaud Philippe5,Wagner Markus R.26,Jahnke Frank1

Affiliation:

1. Institute for Theoretical Physics University of Bremen Otto‐Hahn‐Allee 1 28359 Bremen Germany

2. Institute of Solid State Physics Technische Universität Berlin Hardenbergstr. 36 10623 Berlin Germany

3. Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS) Ludwig‐Maximilians‐Universität München Geschwister‐Scholl‐Platz 1 80539 München Germany

4. Munich Center for Quantum Science and Technology (MCQST) Schellingtraße 4 80799 München Germany

5. Université Côte d'Azur, CNRS CRHEA, rue Bernard Grégory Sophia‐Antipolis 06905 France

6. Paul‐Drude‐Institut für Festkörperelektronik Leibniz‐Institut im Forschungsverbund Berlin e.V. Hausvogteiplatz 5‐7 10117 Berlin Germany

Abstract

AbstractQuantum well nanolasers usually show single‐mode lasing, as gain saturation suppresses emissions in other modes. In contrast, for whispering gallery mode microdisk lasers with GaN quantum wells as active material, above threshold multimode laser emission is observed. This intriguing emission feature is manifested in the fact that several modes simultaneously show the characteristic kink in the input–output curve at the onset of lasing. A quantum theory for nanolasers is used to support the experimental finding and to analyze this behavior in the presence of gain saturation. Coupling effects between neighboring modes are identified as the origin of multimode lasing, which initiate photon exchange between modes via population pulsations similar to classical wave‐mixing effects. A reduction of this type of mode coupling with increasing mode spacing is demonstrated. The results can pave the way for multimode application of nanolasers in integrated photonic circuits.

Funder

Deutsche Forschungsgemeinschaft

LabEx GANEX

Agence Nationale de la Recherche

Publisher

Wiley

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