Patent ID: 7068690

Claim:
A laser-light source comprising: a heat-dissipation block made of copper or copper alloy; a plurality of submounts which are made of a material having a thermal expansion coefficient of 3.5 to 6.0×10−6/,C, have a thickness of 200 to 400 micrometers, and are separately formed on said heat-dissipation block; a plurality of semiconductor lasers each of which is made of a nitride compound, has a single cavity and a form of a chip, and is mounted junction-side-down on one of said plurality of submounts; a multimode optical fiber; and an optical condenser system which collects laser beams emitted from said plurality of semiconductor lasers, and couples the collected laser beams to said multimode optical fiber; wherein each of said plurality of semiconductor lasers and said plurality of submounts has a bonding surface, and the bonding surface of each of the plurality of semiconductor lasers is bonded to the bonding surface of one of the plurality of submounts through a metalization layer and an Au—Sn eutectic solder layer each of which is divided into a plurality of areas.