Observation of reduced current thresholds in GaAs/AlGaAs vertical‐cavity surface‐emitting lasers grown on 4° off‐orientation (001) GaAs substrates
作者:
Y. H. Wang,
K. Tai,
Y. F. Hsieh,
S. N. G. Chu,
J. D. Wynn,
A. Y. Cho,
期刊:
Applied Physics Letters
(AIP Available online 1990)
卷期:
Volume 57,
issue 16
页码: 1613-1615
ISSN:0003-6951
年代: 1990
DOI:10.1063/1.104086
出版商: AIP
数据来源: AIP
摘要:
GaAs/AlGaAs vertical‐cavity surface‐emitting lasers (VCSELs) with two semiconductor distributed Bragg reflectors (DBRs) were grown by molecular beam epitaxy. The threshold current was found to be 20–50% less on an average for VCSELs grown on the 4° off‐orientation (001) substrates than those on the on‐orientation ones. The lower threshold current was attributed to the smoother interfaces of the Al0.1Ga0.9As/AlAs DBRs in the off‐orientation growth observed by transmission electron microscopy. A threshold current and current density of 12 mA and 10.5 kA/cm2were measured with an emission efficiency of 0.2 mW/mA.
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