Optical pick-up apparatus

摘要

A compatible optical pick-up apparatus, which records to and/or reproduce from both digital versatile disc (DVD)-type optical disks and compact disc (CD)-type optical disks for improving a signal regeneration capacity and a tracking capacity in operation at a high temperature. A polarized hologram (43) of the optical pick-up apparatus is divided into six diffraction regions. The rays of a first light (10a) diffracted at the first and second diffraction regions (E, F) are separately received by divided parts of a first bisected light-receiving portion (51b) of a photodetector (50).