Patent ID: 8193016

Claim:
A method of manufacturing a semiconductor laser device, comprising steps of: forming a semiconductor layer on a surface of a substrate; forming a plurality of first recess portions; performing cleavage along said plurality of first recess portions; and forming chips by separating said semiconductor layer along a first direction parallel to said surface, wherein said semiconductor layer includes a plurality of waveguides and first regions, said plurality of waveguides are extending in said first direction, said first regions are separated from said waveguides and extend in said first direction, each of second regions are provided between each of said waveguides and each of said first regions, said plurality of first recess portions are provided in an upper surface of said semiconductor layer and extend in a second direction from said first regions to said second regions, said second direction is parallel to said surface and intersects with said first direction, a thickness of said semiconductor layer on said first region is smaller than a thickness of said semiconductor layer on said second region, and each of said chips has said waveguide on a region approaching a first side from a center of said chip in said second direction.