Optical system
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United States of America Patent
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N/A
Issued Date -
Aug 23, 2007
app pub date -
Jan 13, 2005
filing date -
Jan 16, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An optical system comprising an optical element arranged on an optical axis in the path of a radiation beam. The optical element (2; 116; 202) comprises a birefringent material and has a non-planar face (4) through which the radiation beam passes. The optical system comprises a polarisation control system for controlling polarisation of the radiation beam such that the radiation beam has a polarisation which is non-uniform across a cross section (21; 24) taken perpendicular to the optical axis, the non-uniform polarisation having a distribution corresponding with a shape of the said non-planar face.
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