An InGaAs-GaAs-AlGaAs strained layer single quantum laser array with a
reactive ion etched corner reflector array as its rear facet has been
fabricated. The corner reflectors play a two-fold role as a highly re
flective rear mirror and as a phase-locking coupler. Phase locked oper
ation with beam widths as low as 0.64-degrees are obtained at pumping
currents up to 4xI(th) and output powers up to 60 mW. The coupling mec
hanism and the benefit of the corner reflector to output performance a
re discussed.