OPTICAL PICKUP APPARATUS AND OPTICAL SYSTEM FOR OPTICAL PICKUP APPARATUS

摘要

This invention is directed to an optical pickup apparatus which includes a first laser source (BL) which emits a first beam, a second laser source (AL) which emits a second beam having a polarization plane substantially perpendicular to a polarization plane of the first beam, a polarization diffraction element (HOE) which selectively diffracts one of the first beam and the second beam in accordance with polarized states therof, and an objective lens (OBJ) which records and/or reproduces information by focusing the first beam whch has passed through the polarization diffraction element (HOE) onto an information recording surface of a first optical information recording medium (DSC1), and records and/or reproduces information by focusing the second beam which has passed through the polarization diffraction element (HOE) onto an information recording surface of a second optical information recording medium (DSC2).