Patent ID: 7106682

Claim:
An optical pickup, comprising: a first light source for generating a light beam having a first wavelength; a second light source for generating a light beam having a second wavelength different from the first wavelength; a lens system for focusing the two light beams on an optical disk; a photosensor for sensing reflection light beams from the optical disk; an optical path splitting element for splitting optical paths of the two reflection light beams having different wavelengths; and first and second hologram elements for respectively diffracting at least one of the two light beams of the different wavelengths which were split by the optical path splitting element, and guiding the thus diffracted light to the shared photosensor, wherein the optical path splitting element is the first hologram element for guiding the light beam of the first wavelength to the photosensor, and the first hologram element is configured to diffract both the light beam having the first wavelength and the light beam having the second wavelength.