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Electrically pumped InGaAs quantum dot ring and cylindrical cavity lasers

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7 Author(s)
Groom, K.M. ; Dept. of Phys. & Astron., Sheffield Univ., UK ; Wilson, L.R. ; Mowbray, D.J. ; Skolnick, M.S.
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Operation of an electrically pumped, cylindrical cavity laser containing a stack of five self-assembled InGaAs quantum dot layers is reported. A threshold current density of 47 A cm2 is obtained at 150 K, with whispering gallery mode laser emission observed at ~1.2 eV. Fabrication of a ring cavity via the removal of part of the non-lasing central region of the cylinder results in a 30% reduction in threshold current

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Electronics Letters  (Volume:37 ,  Issue: 20 )