Patent ID: 8575626

Claim:
A bi-section semiconductor laser device comprising: (a) a stacked structure obtained by stacking, in sequence, a first compound semiconductor layer of a first conductivity type composed of a GaN compound semiconductor, a compound semiconductor layer that constitutes a light-emitting region and a saturable absorption region each composed of a GaN compound semiconductor, and a second compound semiconductor layer of a second conductivity type different from the first conductivity type composed of a GaN compound semiconductor; (b) a belt-shaped second electrode on the second compound semiconductor layer; and (c) a first electrode electrically connected to the first compound semiconductor layer, wherein, the second electrode is separated by a separating groove into a first portion configured to provide a forward bias state by supplying a direct current to the first electrode through the light-emitting region and a second portion configured to apply an electric field to the saturable absorption region, and an electrical resistance between the first portion and the second portion of the second electrode is at least 10 times an electrical resistance between the second electrode and the first electrode.