Phased-array lasers with a uniform, stable supermode

A phased-array semiconductor laser with identical coupled waveguides is designed to favor a uniform, stable supermode. All but the two outermost waveguides are equally spaced with the placement of the first and Nth guides chosen so as to increase their coupling coefficient by √2. The lowest and highest order supermodes have a uniform near-field intensity envelope and utilize the injected charges more efficiently. Whichever of these is favored at threshold should remain stable with increasing pumping or under modulation.