Theory of optical gain in ideal GaN heterostructure lasers
作者:
A. T. Meney,
E. P. O’Reilly,
期刊:
Applied Physics Letters
(AIP Available online 1995)
卷期:
Volume 67,
issue 20
页码: 3013-3015
ISSN:0003-6951
年代: 1995
DOI:10.1063/1.114936
出版商: AIP
数据来源: AIP
摘要:
We present gain calculations for ideal bulk GaN and 100 A˚ GaN quantum well laser structures. We show that due to the large electron and hole effective masses in GaN, the room‐temperature material gain characteristics of a 100 A˚ quantum well are a little different from those of bulk GaN up to a gain level of 1000 cm−1, and that the transparency and threshold carrier density is approximately 2.5 times that in an equivalent GaAs structure, with the radiative current density being of order eight times larger. Comparing the unstrained zinc blende and wurtzite crystal structures, we predict improved gain characteristics in the wurtzite case. The introduction of compressive strain, e.g., through pseudomorphic growth between unstrained AlGaN barriers, will benefit both crystal structures, with wurtzite remaining better than zinc blende for mismatch up to about 1.5%. Finally, we note that the gain characteristics would be further improved if it were possible to grow tensile‐strained zinc blende layers. ©1995 American Institute of Physics.
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