| 摘要 |
PROBLEM TO BE SOLVED: To prevent outer extension of recording light and reference light from being emitted to the end part of a photoreceptor and their scattered light from being additionally recorded as a noise when a volume hologram is recorded by recording a spatial distribution of light energy due to interference between the interferable recording light and the reference light and making the exposed part of the photoreceptor only a continuous surface. SOLUTION: A volume holographic memory is coated with light absorption material 6 on its surface cross line part, and prevents irregular reflection of light caused by that the outer extension part of incident light is made incident on this part. Since the light absorption material 6 forming an incident window 7 is formed to a knife edge sectional shape gradually increasing thickness from a boundary with the photoreceptor along the surface cross line, the matter that the incident light onto the incident window 7 strikes the light absorption material 6 end part to be diffracted is prevented, and the scattering of light is suppressed. Further, the matter that the light absorption material 6 is stuck to the photosensitive body without a gap is preferred. The light absorption material 6 is preferred to be substance so as not to reflect/scatter the light. |
