Patent ID: 7502397
Filing Date: 2009-03-10
Classification: H01L,H01S

Abstract:
1. A laser diode assembly comprising: a laser diode device; a submount jointed on a substrate side of the laser diode device with a first solder layer in between; and a heatsink jointed on a rear face side of the submount with a second solder layer in between, wherein the submount has a submount groove at least at a part of a periphery of a joint area along a border of the joint area jointed with the laser diode device, the submount groove having continuous uninterrupted sidewalls, wherein the submount groove is formed along a border of the joint area of the submount on a rear end face side opposite of an emitting end face of the laser diode device and a border of the joint area of the submount on both side wall sides of the laser diode device, wherein several submount thin grooves whose width is smaller and depth is shallower than that of the submount groove are formed on the joint area of the submount so that the submount thin grooves are spaced from each other, and at least one ends of the submount thin grooves contact with the submount groove, wherein the submount thin grooves extend in the direction diagonally to the submount groove, or in the direction parallel to border of the joint area on the rear end face side of the laser diode device, and wherein outlets of the submount groove and outlets of the submount thin grooves, which correspond to the emitting end face side of the laser diode device, are closed.