Patent ID: 7606275

Claim:
A semiconductor laser device comprising: a semiconductor laser element in which a striped light-emitting region is formed; and a heat sink bonded to the semiconductor laser element, wherein the semiconductor laser element includes: a clad layer, a contact layer, and a contact electrode all formed in a ridge structure; a conductive electrode opposed to the heat sink; a solder layer stacked on the conductive electrode, the solder layer being absent over a first region ranging to a specified length from a center line of the light-emitting region in a perpendicular direction, perpendicular to an extensional direction in which the light-emitting region extends in a stripe form as well as perpendicular to a thicknesswise direction of the light-emitting region, toward both sides of the perpendicular direction, while being present over second regions more distant from the center line toward both sides of the perpendicular direction than the first region; and a bonding portion at which the solder layer and a metal layer of the heat sink are alloyed with each other, wherein the ridge structure is formed within a portion of the first region.