Single-mode vertical-cavity top-surface-emitting lasers with maximum o
utput power of 2.7 mW and side-mode suppression of 50 dB have been fab
ricated using solid source MBE for growth and selective oxidation to d
efine the 3-mu m diameter active area. Threshold current is 290 mu A a
nd a maximum wallplug efficiency of 27% is obtained at an output power
of 1 mW.