Patent ID: 7583716

Claim:
A semiconductor laser device comprising: a substrate; a first semiconductor layer of first conductivity type; an active layer; a second semiconductor layer of second conductivity type that is different from the first conductivity type; a waveguide region that is formed in a stripe shape in said second semiconductor layer so that current is restricted to flow in said waveguide region; and resonance surfaces that are substantially perpendicular to said waveguide region; wherein a surface of said second semiconductor layer has a region including at least one recess that is spaced from said waveguide region and is adjacent to one of said resonance surfaces; wherein the surface of said second semiconductor layer includes a plurality of recesses that are spaced from said waveguide region and are adjacent to one of said resonance surfaces; and wherein said plurality of recesses have a linear shape, and the recesses have a side inclined with respect to a resonance surface in a plan view so that light incident is deflected on the side of the recesses into a direction different from a direction of a main beam, thereby effectively suppressing ripples.