A light emitting module and method for shaping a beam via a beam shaping window and an optical pickup apparatus employing the same. The light emitting module includes a base, a semiconductor laser that is installed on the base and emits a laser beam of a predetermined wavelength, a cap surrounding the semiconductor laser, a beam shaping window that is fitted with a predetermined portion of the cap corresponding to the propagation path of the laser beam and shapes a transmitted laser beam while reflecting a portion of an incident beam, and a monitor photodetector that is disposed within the cap and receives the laser beam reflected by the beam shaping window in order to monitor the laser beam emitted by the semiconductor laser.