Abstract
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 Acm-2 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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