Method and apparatus for improved waveplates and suppression of stray light in LCoS kernel applications
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United States of America Patent
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May 9, 2006
Issued Date -
N/A
app pub date -
May 12, 2004
filing date -
Feb 20, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Optical components are louvered with a light absorptive material that absorbs stray light rays. The louvers are constructed, for example, using a 'black' thin film coating between sheets of glass. The louvered components are placed in an optical path at one or more orientations. In one embodiment, a vertically oriented louvered component and a horizontally oriented louvered component are individually located in a light path to reduce and/or eliminate stray light having either horizontal and/or vertical vector components. Compensated higher order waveplates are constructed from birefringent material by placing two higher order waveplates (a n.lamda. waveplate and a (n+.DELTA.).lamda. waveplate.) in proximity to each other such that their principle retardation axes are perpendicular. In one embodiment, the higher order waveplates include louvers for stray light suppression.
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