Patent ID: 8335147

Claim:
A reproduction apparatus for reproducing information from a recording medium which records an interference pattern generated by two optical beams, comprising: a laser light source for radiating a laser beam; an optical element for separating the laser beam from the laser light source into a first optical beam and a second optical beam; a spatial light modulator for adding adjusting information to the separated first optical beam; an objective lens for condensing the first optical beam to which the adjusting information is added on the recording medium; a photodetector for detecting a beam diffracted by radiating the condensed first optical beam to the recording medium; and an angular adjusting portion for adjusting an incident angle of the second optical beam to the recording medium based on information obtained from the photodetector, wherein when reproducing the information from the recording medium, the second optical beam adjusted by the angular adjusting portion is radiated to the recording medium to reproduce the information recorded in the recording medium.