| 摘要 |
PURPOSE: A semiconductor laser is provided to increase the output of laser by adding a cylindrical gain medium to a Fabry-Perot laser. CONSTITUTION: A first conductive-type clad layer(11) is formed on a first conductive-type substrate. An active layer(12) is formed by making a layered linear gain medium formed on the first conductive-type clad layer(11) and at least one cylindrical gain medium overlapped. A second conductive clad layer(13) is formed on the first conductive-type clad layer(11) and an upper portion of the active layer(12). The active layer(12) is comprised of a quantum well. The active layer(12) is comprised of the linear gain medium and the cylindrical gain medium layered with the linear gain medium in a central part of the linear gain medium.
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