| 摘要 |
<p>A hologram device comprises a light generator section for generating a coherent signal light modulated in accordance with a coherent reference light and recording information, a coherent optical system which irradiates the signal light and the reference light towards a recording medium such that those lights intersect with each other within the recording medium and forms a diffraction grating with optical interference patterns within the recording medium, and an optical detector for detecting the regenerated light. On a light incidence plane including the signal light and the reference light in the coherent optical system, a second signal light and a second reference light are arranged in opposition to the signal light and the reference light with the recording medium between. Further, the hologram device has a second coherent optical system for irradiating the second signal light and the second reference light such that those lights intersect with each other within the recording medium, and a second optical detector for detecting the regenerated light.</p> |
