| 摘要 |
PURPOSE:To largely deflect the deflection angle of an emitting light beam with a sufficient resolution by controlling a voltage applied to a voltage applying part of a deflecting device by an outer voltage controller. CONSTITUTION:A light beam 20 propagated through the inside of an optical waveguide 10 containing a quantum well layer 13 is emitted to the outside by a diffraction grating 15 and becomes an emitted light 21. When a reverse bias is applied to the laminated body optical waveguide 10 from a voltage controller 19 through electrodes 16, 17, an electric field can be applied effectively to the multiple quantum well layer 13, and the refractive index of that part can be varied. That is, the direction of the emitted light beam can be controlled freely such as the emitted light beam is brought to a scanning motion by varying periodically an applied voltage, or the irradiating position of the emitted light beam is switched in accordance with an output signal from other device connected to a voltage controller 16. In such a way, the deflection angle of the emitting light beam can be enlarged. |
