4.8 mW singlemode oxide confined top-surfaceemitting vertical-cavity laser diodes

Abstract
The authors have optimised MBE-grown GaAs VCSELs emitting at a wavelength of 840 nm for maximum singlemode output power. Devices of 3.5 µm diameter show a record high singlemode CW output power of 4.8 mW and a butt-coupling efficiency into singlemode fibre of > 80%.