Arrays of five InGaAsP buried‐cresent large‐optical‐cavity lasers operating at 1.3 &mgr;m are described. The monolithically integrated arrays have threshold as low as 60 mA, external quantum efficiencies &eegr;≊55%, and operate in the fundamental transverse mode up to 50 mW per facet at room temperature. Despite the very close center to center spacing of 8 &mgr;m, no electrical or optical interaction between lasers has been observed.