Is a
Patent attributes
Current Assignee
0
Patent Jurisdiction
Patent Number
Patent Inventor Names
William Ernest Lee0
Date of Patent
April 28, 2009
0Patent Application Number
115878120
Date Filed
May 11, 2005
0Patent Primary Examiner
Patent abstract
A polarising double-passed interferometer comprises a polarising beamsplitter (16), a reference mirror (20) in the path of a reference beam (14) and a movable measurement mirror (26) in the path of a measurement beam (12). The reference and measurement beams have different polarisations. An angular beam deflection device such a glass wedge or prism (32) acts to remove or separate out an error beam (30) caused by leakage of light of one polarisation into the path of light of the other polarisation.
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