| 摘要 |
A laser device having an optical semiconductor element formed from a compound semiconductor material, and having a wavelength-selective reflection element that includes an optical waveguide, characterized in that the optical semiconductor element has a first gain waveguide, a second gain waveguide, a DBR waveguide formed between the first gain waveguide and the second gain waveguide, a first electrode for passing an electric current through the first gain waveguide, and a second electrode for passing an electric current through the second waveguide, an antireflection film being formed on the element end surface connected to the second gain waveguide, the optical waveguide in the wavelength-selective reflection element reflecting light of a given wavelength as part of incident light, the first gain waveguide and the wavelength-selective reflection element being optically coupled, the first gain waveguide being a gain medium, and a laser resonator being formed by the DBR waveguide and the wave-selective reflection element. |
