We have fabricated a new type of channel stripe laser with a curved active region which has a spatially stabilized output for measurements up to 2ITh(Pout=75 mW/facet). The CJSF laser has excellent lateral and longitudinal mode selectivity. The laser operates in almost single longitudinal mode when the current exceeds 1.1ITh. Zeroth‐order lateral mode operation is obtained for currents less than 1.5ITh(Pout=30 mW/facet) and linear power output for measurements up to 2ITh. We attribute the favorable characteristics to the curvature of the grown layers which leads to the stabilization of the lateral modes.