| 摘要 |
A holographic recording medium includes a recording layer in which data are to be recorded as phase information of light by projecting a signal beam and a reference beam thereonto, a reflective surface disposed on the opposite side of the recording layer as viewed in the direction of signal beam and reference beam incidence on the holographic recording medium and formed with a convex pattern or a concave pattern having a trapezoidal cross-section, a minimum width of a convex surface of the convex pattern or a concave surface of the concave pattern being set equal to or larger than a beam spot diameter of the signal beam or the reference beam at a diffraction limit thereof. According to the thus constituted holographic recording medium, it is possible to easily remove noise light contained in a signal beam and a reference beam.
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