Patent ID: 7522792

Claim:
A laser light source comprising: a semiconductor laser which emits a laser light; and an optical element which-transmits the laser light, said optical element comprising: a plurality of waveguides transmitting the laser light; and a plurality of light path coupling parts which couple adjacent waveguides and optically couple said plural waveguides serially, the plurality of light path coupling parts comprising: a reflection plane which reflects and refracts laser light passing through the waveguides, wherein optical path length L from a light input surface of the waveguides to a light output surface of the waveguides satisfies the following equation: L≧W /tan(sin −1 (sin(θ/2)/n)), wherein W is a width of the waveguide, n is a refractive index inside the waveguide, and θ is a minimum beam spread angle of the semiconductor laser.