| 摘要 |
A hologram recording and reproducing system for recording information to or reproducing information from a recording medium which stores an optical interference pattern of a reference beam and a signal beam as a diffraction grating, the system comprising: a light source for generating a coherent beam; and a light generation section which is disposed on an optical axis, has a signal beam region and a reference beam region that are in a rotary inversion with respect to the optical axis in a cross-section of the coherent beam, and spatially splits the coherent beam into a signal beam and a reference beam which propagate in the signal beam region and the reference beam region respectively; a light interference section which is disposed on the optical axis, has a signal beam region and a reference beam region that are in a rotary inversion with respect to the optical axis, corresponding to the signal beam region and the reference beam region to transmit the reference beam and the signal beam respectively, and condenses the reference beam and the signal beam at different focal points on the optical axis so as to allow the reference beam and signal beam to interfere; a recording medium comprising a hologram recording layer at least positioned between the different focal points; and image detection means which is disposed on the optical axis and receives light returning from the hologram recording layer when the reference beam is irradiated on the hologram recording layer via an objective lens optical system.
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