In a laser light source comprised of a semiconductor light-emitting element and a waveguide-type wavelength selection element, the semiconductor light-emitting element emits light, and the waveguide-type wavelength selection element selects a wavelength of the light emitted from the semiconductor light-emitting element. A first end face of the semiconductor light-emitting element and an end face of the waveguide-type wavelength selection element are butt-coupled. An antireflection optical system for the wavelength selected by the waveguide-type wavelength selection element is formed between the first end face of the semiconductor light-emitting element and the end face of the waveguide-type wavelength selection element. A second end face of the semiconductor light-emitting element and the waveguide-type wavelength selection element form an external resonator in which light having the wavelength selected by the waveguide-type wavelength selection element resonates. The light which resonates in the external resonator exits from the second end face of the semiconductor light-emitting element.
展开▼
