| 摘要 |
PURPOSE:To speed up the operation of the optical recording and reproducing device with simple constitution by using an optical waveguide as a recording medium and reproducing whether or not waveguide light is scattered by a refractive index discontinuous part by plural detectors at the same time. CONSTITUTION:When reproduction is performed, the laser beam 3 from a semiconductor laser 1 for reproduction is guided from an optical coupling part 4 into an optical waveguide recording medium 5 and a part of its waveguide light 7 is scattered by refractive index discontinuous recording parts 9, 9', and 9''' to become leak waveguide light, thereby generating scattered light beams 13, 13' and 13'' outside the waveguide. The scattered light beams are photodetected by photodetectors 17, 17', 17'' and 17''' which are arrayed opposite at intervals and the output of each detector turns on and off or varies according to whether or not there is a bright point, thereby reproducing information recoded on the optical waveguide recording medium 5. The scatter efficiency per bit from the waveguide light 7 to the scattered light 13 is determined by the refractive index ratio, the depth of a pit, and the area of the ellipse at the border of the pit. When a GaAlAs semiconductor laser which generates a continuous output of 10mW is used as a reproduction semiconductor laser 1, the scattered light output per pit is about 0.1muW and sufficient detection is performed by a semiconductor photodetector. |
