Phase front measurements of AlGaAs 830 nm phase-locked lasers with a real-refractive-index waveguide

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Abstract
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.