HOLOGRAPHIC RECORDING METHOD, HOLOGRAPHIC RECORDING DEVICE, HOLOGRAPHIC MEMORY REPRODUCTION METHOD, HOLOGRAPHIC MEMORY REPRODUCTION DEVICE, HOLOGRAPHIC RECORDING/REPRODUCTION DEVICE, AND HOLOGRAPHIC RECORDING MEDIUM

摘要

When searching information recorded on a holographic recording medium, it is possible to reduce the pitch of the optical beam spot on the address detector photo-detection surface so as to reduce the distance between the holographic recording medium and the address detector. The holographic recording/reproduction device (10) applies a beam to the holographic recording medium (20) by making the beam shape of the reference light to be elliptic with respect to the holographic recording medium (20) by a beam shaping optical system (30) while keeping the object light to be circular, so that interference stripes are formed only inside the ellipse and even when the distance between the address detector (28) and the holographic recording medium (20) is small, it is possible to prevent cross-talk between the array-shaped 2-dimensional photo-detectors (28A, 28B, 28C, ...) constituting the address detector (28).