Patent ID: 7885305
Filing Date: 2011-02-08
Classification: H01S

Abstract:
1. A semiconductor laser device comprising: a first conductive type clad layer; a second conductive type clad layer; an active layer, disposed between the first conductive type clad layer and the second conductive type clad layer; a light emitting surface and a light reflecting surface, disposed so as to oppose each other in a predetermined axial direction; a refractive index type main waveguide, formed in the active layer, having a pair of side surfaces, and making laser light resonate between the light emitting surface and the light reflecting surface; and an optical path portion, disposed at least at one of either between the light emitting surface and one end of the main waveguide or between the light reflecting surface and the other end of the main waveguide, wherein a relative angle θ of the pair of side surfaces of the main waveguide with respect to the light emitting surface and the light reflecting surface is based on a total reflection critical angle θc at the pair of side surfaces, and the optical path portion is arranged in a manner such that light deviating from the predetermined axial direction in the optical path portion is suppressed in resonance and is emitted from a non-resonance end face region for the resonance suppressed light, differing from a resonance end face region for the laser light which resonates, at least at one surface among the light emitting surface and the light reflecting surface.