Effect of substrate tilting on molecular beam epitaxial grown AlGaAs/GaAs lasers having very low threshold current densities
作者:
H. Z. Chen,
A. Ghaffari,
H. Morkoc¸,
A. Yariv,
期刊:
Applied Physics Letters
(AIP Available online 1987)
卷期:
Volume 51,
issue 25
页码: 2094-2096
ISSN:0003-6951
年代: 1987
DOI:10.1063/1.98958
出版商: AIP
数据来源: AIP
摘要:
Single quantum well, graded refractive index separate confinement heterostucture (SQW GRINSCH) lasers with well thicknesses in the range of 65–480 A˚ have been grown by molecular beam epitaxy (MBE) on (100) and off of (100) by 4° toward (111)Asubstrates. The threshold current density appears to be independent of the well thickness in the range of 65–165 A˚ due to the compensating effects of volume of inversion and optical confinement. Under optimum growth conditions, the tilted substrates led to lower threshold current densities, the lowest value being 93 A/cm2for a 520‐&mgr;m‐long cavity laser with a 125‐A˚‐thick well. To our knowledge, this is by far the best ever reported threshold current density obtained in a semiconductor injection laser. Deviations from optimum growth conditions drastically increased the threshold current density on (100) substrates whereas the degradation for those on the tilted substrates was much less pronounced.
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