Patent ID: 7929587

Claim:
A semiconductor laser diode element comprising: a semiconductor laser diode portion including a ridge portion extending in a first direction in which a cavity extends, a groove formed along said ridge portion and a support portion formed along said groove on a side farther from said ridge portion and holding said groove between said support portion and said ridge portion; and a support substrate bonded to said semiconductor laser diode portion through a fusion layer, wherein: said fusion layer is formed so as to be embedded in said groove, a space from said ridge portion to said support substrate and a space from said support portion to said support substrate, said fusion layer includes a first eutectic alloy layer, a second eutectic alloy layer formed on said first eutectic alloy layer, a third eutectic alloy layer formed on said second eutectic alloy layer, and the melting point of said second eutectic alloy layer is lower than the melting points of said first eutectic alloy layer and said third eutectic alloy layer.