| 摘要 |
PURPOSE:To make it possible to perform arbitrary selection and operation at any of a plurality of different oscillating wavelengths, by constituting an optical resonator by a diffraction grating comprising a refractive index chaning part, which is formed by an electric field in a grating shape in a crystal body having an electrooptical effect, and arbitrarily selecting the grating constant of the diffraction grating in correspondence with the way of applying the electric field. CONSTITUTION:A laser diode is constituted by an N-type semiconductor layer 1, an active layer 2 and a P-type semiconductor layer 3. When a voltage is applied to electrodes 4 and 5, simulated emission light is generated from the active layer 2. A crystal layer 7 is made of, e.g., LiNbO3 and the like. Its optical axis A is oriented toward the horizontal direction together with the laminated semiconductor layer 1. On the surface of the layer 7, grating electrodes 8, which are formed by arranging a plurality of thin conductor layers in parallel at a specified pitch P, are formed. Leads are taking out of a plurality of the thin conductor layers constituting the grating electrodes 8 independently to the out side of the laser element. Voltages can be independently applied to the layers. |
