An external cavity type semiconductor laser apparatus.

摘要

An external cavity type semiconductor laser apparatus comprises a semiconductor laser device (1) and an external reflector (2), which are mounted on a single mounting base (3) with a distance therebetween, wherein laser light from the light-emitting rear facet (1a) of the laser device is reflected by the reflector (2) and returns to the laser device, the coefficient of linear expansion of the mounting base (3) being smaller than that of Cu and being greater than those of both the laser device (1) and the reflector (2).