Title :
Room-temperature, electrically-pumped multiple-active-region VCSELs with high differential efficiency at 1.55 /spl mu/m
Author :
Kim, J.K. ; Hall, E. ; Sjölund, O. ; Almuneau, G. ; Coldren, L.A.
Author_Institution :
California Univ., Santa Barbara, CA, USA
fDate :
6/24/1999 12:00:00 AM
Abstract :
All-monolithic, single-step grown, room-temperature, electrically-pumped vertical cavity lasers based on III-As compounds are presented with a threshold current density 570 A/cm/sup 2/, a differential efficiency greater than 50% and a threshold voltage of 3 V. The lasers employ three active regions, epitaxially stacked in series with Esaki junctions to increase the gain and the differential efficiency.
Keywords :
surface emitting lasers; 1.55 micrometre; 3 V; Esaki junctions; differential efficiency; electrically-pumped multiple-active-region VCSELs; epitaxial stacks; gain; single-step growth; threshold current density; threshold voltage; vertical cavity lasers;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19990760
