3 March 2014 Coaxial tunnel junctions: a novel approach to reduce the current crowding effect in electrically-pumped VECSELs
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Abstract
A numerical investigation of the current injection into the active region of electrically-pumped vertical-external-cavity surface-emitting lasers (E-VECSELs) is presented. To achieve high power of emission, a broad aperture is necessary, but such geometry favors multimode operation as the result of undesired current crowding. To reduce this effect, we propose a novel approach of selectively etched tunnel junctions in the form of coaxial rings. The paper presents the optimization of this novel geometry as an efficient approach for increasing the single mode output power of such laser.
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J. Walczak, M. Wasiak, R. P. Sarzala, A. Sirbu, E. Kapon, T. Czyszanowski, "Coaxial tunnel junctions: a novel approach to reduce the current crowding effect in electrically-pumped VECSELs", Proc. SPIE 8966, Vertical External Cavity Surface Emitting Lasers (VECSELs) IV, 89660I (3 March 2014); doi: 10.1117/12.2037272; https://doi.org/10.1117/12.2037272
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