An optical pickup module with enhanced aberration correctability is
disclosed. This pickup includes more than two different types of laser
light sources, an objective lens for collecting and focusing any one of
the laser beams leaving the light sources onto an optical disc, and an
aberration correction device of the liquid crystal (LC) type, which is
disposed between the light sources and the objective lens. The aberration
corrector has a surface on which multiple spaced-apart electrodes are
patterned for enabling aberration correction relative to incident beams.
The corrector controls the potential of a voltage being applied to each
electrode in deference to incident beam properties and variations
occurrable thereto, e.g., wavelength, effective beam diameter and
relative incidence position offsets, thereby to optimally correct beam
aberrations, such as coma aberration or wavefront aberration. An optical
information reproduction apparatus using the pickup is also disclosed.