Patent ID: 6697398
Filing Date: 2004-02-24
Classification: G11B

Abstract:
A laser light intensity controller for controlling a light intensity of a laser beam emitted from a light source of an optical apparatus, comprising:a polarization separating device for passing therethrough a first portion of a first polarization component of the laser beam emitted from said light source and for reflecting a second portion of the first polarization component as monitoring light; a light receiving device for receiving said monitoring light reflected by said polarization separating device to generate a light intensity signal indicative of the received light intensity; a driving device for driving said light source in accordance with said light intensity signal; and an optical element arranged between said light source and said polarization separating device for passing the first polarization component and for cutting off a second polarization component, which is a component perpendicular to the first polaraization component, of the laser beam emitted from said light source.