Patent ID: 7830945

Claim:
A laser apparatus comprising: a block; a plurality of laser diodes respectively having light-emission points and being fixed to said block so that the light-emission points are aligned along a direction; and a collimator-lens array integrally formed to contain a plurality of collimator lenses which are arranged along a direction and respectively collimate laser beams emitted from said plurality of laser diodes; wherein said block has a lens-setting surface which is flat, perpendicular to optical axes of said plurality of laser diodes, and located on a forward side of said plurality of laser diodes at a predetermined distance greater than zero along said optical axes from said light-emission points, and said collimator-lens array is fixed to said block so that an area of an end surface of said collimator-lens array is in contact with and overlaps an area of said lens-setting surface at only outer sides of said block with respect to a widthwise direction of said block, wherein each of said plurality of laser diodes is realized by a nitride-based compound laser-diode chip, wherein said block is a heat-dissipation block made of copper or copper alloy, wherein said laser apparatus further comprises 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, wherein each of said plurality of laser diodes and said plurality of submounts has a bonding surface, and wherein each of said plurality of laser diodes is junction-side-down mounted on one of said plurality of submounts in such a manner that the bonding surface of said each of the plurality of laser diodes is bonded to the bonding surface of said 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.