Patent ID: 7687374

Claim:
A method of isolating semiconductor laser diodes (LDs), comprising the steps of: preparing a substrate; forming a plurality of semiconductor LDs on the substrate, each semiconductor LD including an n-type semiconductor layer, an active layer, a p-type semiconductor layer, an n-electrode, a ridge portion, and a p-electrode, the ridge portion being formed by etching the p-type semiconductor layer such that a portion of the p-type semiconductor layer protrudes, the p-electrode being formed on the ridge portion; partially forming base cut lines on the surface of the substrate excluding the ridge portions; and isolating the semiconductor LDs into a bar shape along the base cut lines, wherein a cut region having the base cut lines formed on the surface of the substrate occupies more than 75% of the overall region composed of the cut region and an uncut region where the base cut line is not formed, and wherein a ratio of the cut region to the uncut region is 3:1.