Tunable optical filter, optical apparatus for use therewith and method utilizing same
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United States of America Patent
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May 22, 2007
Grant Date -
Jul 1, 2004
app pub date -
Aug 7, 2003
filing date -
Aug 7, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for filtering an input beam of light to produce an output beam of light is provided. The apparatus facilitates tuning an input beam of light to a desired wavelength by directing the input beam of light, via a mirror, onto a diffractive optical element and returning the diffracted portion of the input beam of light as an output beam of light. The apparatus may also include a polarization recovery element adapted for receiving the input beam of light and outputting a first and second spatially offset beam of polarized light. The apparatus may also be configured as a tunable receiver by utilizing a detector to detect a characteristic of a filtered output beam. The output beam may be additionally filtered by a spatial filter.
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