Patent ID: 7990830

Claim:
An optical pickup for recording information in a holographic storage medium and/or for reproducing information from a holographic storage medium comprising: a laser light source; a beam splitter which separates an optical beam generated from the laser light source into a reference beam and a signal beam; a spatial light modulator which modulates intensity and/or phase distribution of the signal beam; a PBS prism which guides the signal beam to the spatial light modulator, guides the modulated signal beam to the holographic storage medium during recording, and guides the reference beam to the holographic storage medium during at least one of the recording and reproducing; and an objective lens through which the reference beam and the signal beam pass prior to entering the holographic storage medium, wherein: the signal beam and the reference beam pass through the PBS prism as parallel beams; and a concave lens is placed on a reference beam path just before the objective lens.