Patent ID: 7936803

Claim:
An external cavity semiconductor laser comprising: a semiconductor laser device for emitting laser light in at least two directions from a first end surface thereof, one of the laser light emitted from the semiconductor lasers device being an external cavity laser light, and the other laser light being an output laser light; an optical beam-rectifying device disposed in the optical path of the external cavity laser light and in the optical path of the output laser light; and a reflecting unit including a reflective surface for reflecting only the external cavity laser light and a die-cut non-reflective region having a coating formed thereon selected from the group consisting of: a light absorbing coating; and an anti-reflection coating, wherein a beam shape of the external cavity laser light is adjusted by the coating and a shape of the non-reflective region, the optical beam-rectifying device includes: a first laser spreading angle-adjusting section for condensing the laser light in a first direction orthogonal to a surface including the optical axis of the laser light emitted in two directions from the semiconductor laser device; and a second laser spreading angle-adjusting section for condensing the laser light in both a first direction and a second direction where the second direction is orthogonal to the direction of a center axis that divides the optical axes of two laser lights emitted from the semiconductor laser device and orthogonal to the first direction.