A modulated light beam, as received from a magnetooptic record medium, carries information in the form of linear polarization rotations having P and S components, herein also referred to as light-phase modulated light. A phase-to-intensity converter optically rotates one of the component linear polarization...http://www.google.com.au/patents/US4823220?utm_source=gb-gplus-sharePatent US4823220 - Detector for magnetooptic recorders
