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A phase-locked laser array with refractive-index waveguides and emitting a low phase-aberration beam is described. A fundamental supermode operation of an evanescent-coupled three-element laser array which emits up to 200 mW in a single diffraction-limited beam is achieved. The full beam angle at the half-power point is 3.2° in the direction of parallel to the p-n junction. This phase aberration is less than λ/14 from 50 to 150 mW. The extremely low phase aberration (0.022λ) is measured at 50 mW.

Phase-locked lasers with refractive-index waveguides have been developed. The elemental stripes of the laser are evanescently and offset coupled. A fundamental supermode operation in the 2/3-element laser arrays is achieved. The phase aberration is less than λ/14 (λ=830 nm). The output power of the laser array increases almost linearly up to 200 mW with an external differential slope efficiency of 0.75 W/A.

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