Patent ID: 7313072

Claim:
A holographic recording medium comprising: 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 layer disposed on an opposite side of the recording layer as viewed in a direction of the signal beam and the reference beam incidence on the holographic recording medium, the reflective layer including a beam spot incidence region for reflecting the signal beam and the reference beam toward the recording layer projected thereonto via the recording layer; and a filter region formed at a periphery of the beam spot incidence region and having a property of scattering or absorbing the signal beam and the reference beam projected thereonto via the recording layer, the filter region being configured to receive only a non-collimated portion of the signal beam or the reference beam projected thereonto via the recording layer, a minimum width of the beam spot incidence region being substantially equal to a beam spot diameter of the signal beam or the reference beam at a diffraction limit thereof.