Phase-locked, index-guided multiple-stripe lasers with large refractive index differences

Phase-locked operation of multiple-stripe lasers with refractive index differences on the order of 10−2 is reported. The higher order modes of each stripe are suppressed by the coherent coupling among the stripes, and the fundamental modes are selectively excited by the phase-locked operation. The light-current characteristics were linear up to 250-mW light output.