Beamsplitters with offset compensation
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United States of America Patent
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May 8, 2012
Grant Date -
Jan 27, 2011
app pub date -
Apr 4, 2008
filing date -
Apr 4, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Embodiments of the present invention are directed to beamsplitters that include optical elements to correct for beam offset. In one embodiment, a beamsplitter includes a first plate having two approximately parallel and opposing planar surfaces and a partially reflective layer coating one of the planar surfaces, and a compensator plate having two approximately parallel and opposing planar surfaces. The compensator plate is positioned so that an incident beam of light passing through the compensator plate acquires a first beam offset. Subsequently, the incident beam of light with the first beam offset passing through the first plate is split into a reflected beam and a transmitted beam by the partially reflective layer where the transmitted beam has a second beam offset that substantially cancels the first beam offset such that the transmitted beam is approximately parallel to and aligned with the incident beam.
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