| 摘要 |
PURPOSE:To vary an optical coupling point in real time by using a hologram in which the distribution information of an interference fringe is recorded, for an optical phase variation material, writing the information through a prescribed laser beam scanning system, and allowing a reproducing laser beam to be made incident at the time of reproduction. CONSTITUTION:A hologram in which the distribution information of an interference fringe is recorded is used for an optical phase variation material 4 by which a reflecting state of an irradiated part is varied by radiating a prescribed laser beam. When the laser beam 1 is made incident on the optical phase variation material 4, inversion areas 16, 17 where the reflecting state of a light beam in the prescribed segment area of an incident point is varied are formed. When these inversion areas 16, 17 are irradiated with a reproducing laser beam 21, a reproducing hologram is obtained. Accordingly, after recording, the reproduction can be executed immediately. In such a manner, by varying successively the diffracting direction, the optical coupling point can be varied in real time. |
