Patent ID: 7577075

Claim:
An optical information recording and reproducing apparatus, comprising: an optical system for performing recording and reproduction using holography, the optical system including a first laser light source, a spatial light modulator for generating an information light and a reference light which share an optical axis from a light beam of the first laser light source, an objective lens for condensing a light beam from the spatial light modulator onto a recording medium, and a light detector for receiving a reflected light from the recording medium; and a servo optical system for tracking the light beam condensed onto the recording medium by the objective lens, the servo optical system including a second laser light source wherein a light beam from the second laser light source is condensed onto the recording medium via the objective lens, a servo light detector for receiving a reflected light from the recording medium based on the light beam from the second laser light source, and a controller for controlling the first laser light source and the second laser light source so that light is emitted time-divisionally.