Patent ID: 8451530

Claim:
A laser source comprising: a laser device configured to include a linear current injection region and a curved optical waveguide and emit laser light at a given angle with respect to a normal of an output end face; and an optical device configured to include an optical waveguide that guides, wavelength-converts the laser light, and outputs the laser light as converted light, wherein the output end face of the laser device is parallel to an input end face of the optical device, and in order for the linear current injection region of the laser device and a direction of outgoing light from the laser device to be parallel, the optical device is formed such that the optical waveguide extends in a direction of θ w1 that is given by θ w1 =arcsin(sin θ a1 /n eF ) where θ a1 denotes an outgoing angle of the laser light from the laser device, and n eF denotes an effective refractive index of the optical waveguide for a fundamental wave of the laser light, extraordinary light axis of crystal of the optical waveguide is perpendicular to the direction of θ w1 , and equations θ w2 =arctan(sin θ w1 /( n eSH −cos θ w1 ))and θ w2 =θ w1 =θ a2 are satisfied, where n eSH denotes an effective refractive index of the optical waveguide for the converted light, θ w2 denotes an angle between the direction of the optical waveguide and a normal of an output face of the wavelength conversion element, and θ a2 denotes a refraction angle of outgoing light with respect to the normal of the output face of the wavelength conversion element.