Patent ID: 7206108

Claim:
A holographic recording and reproducing method for recording holographic data in and reproducing holographic data from 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 emitted from a first light source and having a wavelength λ 0 thereonto and an optical modulation pattern periodically formed in a direction of a track on a surface located on an opposite side of the recording layer as viewed in a direction of signal beam and reference beam incidence on the holographic recording medium, the holographic recording and reproducing method comprising projecting a light beam for servo control emitted from a second light source and having a wavelength λ 1 onto the holographic recording medium so as to substantially focus onto the surface on which the optical modulation pattern is formed, thereby generating clock signals in synchronism with the optical modulation pattern, wherein during recording, the signal beam is projected along a first optical path and the reference beam and the light beam for servo control are projected along a second optical path different than the first optical path.