| 摘要 |
PROBLEM TO BE SOLVED: To prevent energy loss and recording of an erroneous information due to reflection of coherent light on an interface and to improve the recording accuracy by forming an antireflection layer on at least one of the surfaces of a transparent substrate and interfaces of layers. SOLUTION: When a signal beam 10 and a referential beam 11 enter one transparent substrate 3, both of the signal beam 10 and the referential beam 11 reach the surface of the transparent substrate 3 (interface with air) and further reach the interface between the transparent substrate 3 and a recording layer 2. Since antireflection layers 7, 5 are formed on the interfaces in the hologram memory 1, an energy loss by reflection of the signal beam 10 and the referential beam 11 can be prevented. Further, when the signal beam 10 and the referential beam 11 entering the recording layer 2 transmit through the recording layer 2 to outgo from the transparent substrate 4 to the outside, both of the beams are not reflected by the interfaces owing to the antireflection layers 6, 8 on the respective interface, but outgo from the transparent substrate 4. |
