SEMICONDUCTOR LASER DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor laser device in which a Peltier element can be prevented from being broken.SOLUTION: A semiconductor laser device 1 according to the present invention includes: a plurality of semiconductor lasers 2 emitting laser beams; a laser support 3 supporting the plurality of semiconductor lasers 2 at one side 31 thereof and having thermal conductivity and thermal expandability; a plurality of Peltier elements 5 each of which has a heat absorbing part 53 coupled to the other side 32 of the laser support 3 in order to cool the laser support 3; and a Peltier cooling part 6 coupled to a heat dissipating part 54 of each of the Peltier elements 5 in order to cool each of the Peltier elements 5. The laser support 3 transfers heat from the semiconductor lasers 2 to the Peltier elements 5 so that the temperature difference between the heat absorbing part 53 and the heat dissipating part 54 becomes smaller as the Peltier element 5 is disposed to be further apart from the origin point of thermal expansion.