| 摘要 |
<p>A method for rewriting data in a three-dimensional optical memory device in which a created bit can be shifted, and the data can be rewritten and which is fabricated in glass by an ultra-short light pulse. In the method, a bit (23) is three-dimensionally created in a glass (18) by a light-induced variation of the index of refraction by applying a first ultra-short pulse laser beam, a second ultra-short pulse laser beam having an energy smaller than that of the first ultra-short pulse laser beam is applied to the three-dimensionally created bit (23), the laser beam is focused by a focusing lens (17) at a point shifted a predetermined distance in the opposite direction to that of the propagation of the laser beam from the bit (23) to be moved, and thus the bit (23) is moved to rewrite the bit.</p> |
