Semiconductor laser element with excellent high-temperature characteristic and capable of being readily mounted on an optical circuit board.

摘要

In a semiconductor laser element which has a semiconductor block (2) including a first end surface (1), a second end surface (3) opposite to the first end surface, and a principal surface (5) contiguous to the first and the second end surfaces, the internal end surface (6) is defined by forming a groove (7) from the principal surface to be opposite to the second end surface and nearer to the second end surface than the first end surface. The internal end surface serves as a front laser beam emitting surface while the second end surface serves as a rear laser beam emitting surface. Thus, an optical resonator is provided between the internal and the second end surfaces. The internal end surface is spaced apart from the second end surface by a length of 150 mu m which is different from a length of the semiconductor block. The short cavity length with highly reflective facets yields improved high temperature operation.