Narrow bandpass filter assemblies for solar telescopes
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United States of America Patent
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Jul 8, 2008
Grant Date -
Nov 1, 2007
app pub date -
Apr 29, 2006
filing date -
Apr 29, 2006
priority date (Note) -
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Abstract
The invention relates to the combination of lower transmittance etalons with higher transmittance filters, including use of a single circular polarizer with high efficiency and optical performance for its filtered polarization, to achieve necessary throughput of a narrow bandpass region. The lower transmittance etalons can be achieved by using lower transmittance solid-state etalon materials, or by control of the coatings on the etalon. Alternate configurations are described that reduce the optical assembly's footprint, and/or include additional filters to remove stray light. An innovative option to heat the etalon directly is disclosed to actively stabilize and maintain the etalon's bandpass.
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