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In-Plane Optical Read Block for a Magnetooptic Storage Device

IP.com Disclosure Number: IPCOM000103061D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 36K

Publishing Venue

IBM

Related People

Stahl, R: AUTHOR

Abstract

A data signal from a magnetooptic storage device returns from the media as a slight rotation of the axis of the linear polarization of a laser source. Detection of this rotation is commonly performed by use of a half wave plate to reorient the plane of polarization to 45 degrees and then passing the beam through a polarizing beam splitter to obtain two paths for differential detection of the data signal. (Image Omitted)

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This is the abbreviated version, containing approximately 100% of the total text.

In-Plane Optical Read Block for a Magnetooptic Storage Device

      A data signal from a magnetooptic storage device returns from
the media as a slight rotation of the axis of the linear polarization
of a laser source.  Detection of this rotation is commonly performed
by use of a half wave plate to reorient the plane of polarization to
45 degrees and then passing the beam through a polarizing beam
splitter to obtain two paths for differential detection of the data
signal.

                            (Image Omitted)

      This article describes a prism that contains a polarizing beam
splitter and reflecting surfaces.  This prism provides the two output
paths in the plane of the head optics and eliminates the need for a
half wave plate by placing the beam splitter plane at a 45 degree
angle to the input polarization.  The prism orientation is such that
the outputs are parallel and in the plane of the input optical path
of the head simplifying head construction and alignment, and allowing
for a small form factor.

      Disclosed anonymously.