Patent ID: 8879592
Filing Date: 2014-11-04
Classification: H01L,H01S

Abstract:
1. A semiconductor laser device comprising: a semiconductor laser bar having a plurality of light emission points arrayed on a straight line; a plate-shaped liquid-cooled heat sink in which a fluid passage is formed and which has a thickness equal to or less than 3 mm; a first sub-mount which is fixed onto one surface of the semiconductor laser bar, made of a material having a linear expansion coefficient less than that of the heat sink, and fixed onto the heat sink; a second sub-mount which is fixed onto the other surface of the semiconductor laser bar and made of a material having a linear expansion coefficient less than that of the heat sink; and a molybdenum reinforcement member fixed onto a position on a surface of the heat sink opposite to the surface on which the first sub-mount is mounted, the position being opposed to the first sub-mount, the molybdenum reinforcement member having a linear expansion coefficient less than that of the heat sink and a thickness of 0.1 to 0.5 mm, wherein the molybdenum reinforcement member, the heat sink, the first sub-mount, the semiconductor laser bar and the second sub-mount are arranged in this order.