TITLE

Low-threshold green laser heterostructures with Zn(Mg)SSe/ZnSe graded-index superlattice waveguide: Structural and optical properties

AUTHOR(S)
Sedova, I. V.; Lutsenko, E. V.; Gronin, S. V.; Sorokin, S. V.; Vainilovich, A. G.; Sitnikova, A. A.; Yablonskii, G. P.; Alyamani, A.; Fedorov, D. L.; Kop'ev, P. S.; Ivanov, S. V.
PUB. DATE
April 2011
SOURCE
Applied Physics Letters;4/25/2011, Vol. 98 Issue 17, p171103
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on structural and optical properties of green (λ∼520 nm) ZnCdSe/ZnMgSSe optically pumped laser heterostructures with a Zn(Mg)SSe/ZnSe graded-index superlattice (SL) waveguide, grown by molecular beam epitaxy. The pseudomorphic 400 nm thick waveguide comprising a set of strained ZnMgSSe/ZnSe and ZnSSe/ZnSe SLs of different periods and barrier-to-well thickness ratios at each side of a ZnCdSe quantum well (QW) active region provides efficient transport of nonequilibrium carriers to the QW. This results in reduction in laser threshold down to the extremely low value of 1.5 kW/cm2 at 300 K and increasing the external quantum efficiency above 44%.
ACCESSION #
60283655

 

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