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Browse Prior Art Database

Polarization Splitting Prism

IP.com Disclosure Number: IPCOM000100791D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Luecke, F: AUTHOR

Abstract

Disclosed is a polarization beam-splitting prism design which allows the orientation of the planes of beam separation and polarization to be set independently, while the output beams remain essentially parallel to the input beam.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 65% of the total text.

Polarization Splitting Prism

       Disclosed is a polarization beam-splitting prism design
which allows the orientation of the planes of beam separation and
polarization to be set independently, while the output beams remain
essentially parallel to the input beam.

      The separation of polarization is effected by the polarization-
dependent difference in index of refraction of various anisotropic
crystalline materials such as quartz, calcite, or lithium niobate, as
in a Wollaston prism. However, in contrast to a Wollaston prism, the
crystal axes of the two halves of this prism may be considered to be
rotatable (together) about the axis of the incident beam while the
plane of separation between the two halves (and thus the orientation
of separation of the emergent beams) also may rotate, independently,
about that same axis.  The amount of tilt of the plane of separation
also can vary; this angle, along with the crystal's refractive
indices, determines the angular separation of the emergent beams. Any
combination of angles is possible; Wollaston prisms form one subset
of this general case.

      One example of the possible embodiments is shown in Fig. 1.
Here the crystal axes are oriented at 45o to the prism edges while
the plane separating the prism halves is normal to the base plane.
An incident beam having a plane of polarization parallel or normal to
the base plane will be split into two equal beams along a plane
parallel to the base; the emergent beams...