A liquid crystal element is provided as a polarization plane rotating device
between
a laser beam source and a beam splitter. Light emitted from the laser beam source
passes through the liquid crystal element and the beam splitter, and is converted
into parallel light by a collimating lens. The collimated light is incident on
a first light-selection device, is reflected at a flat first reflecting surface
or a concave second reflecting surface, and is then incident on a super-resolution
cut-off filter as a second light-selection device. The light having passed through
the second light-selection device is incident on an objective lens, and is converged
onto a recording surface. The selection of the reflecting surface of the first
light-selection device is determined based on an operation mode of the liquid crystal element.