Narrow bandpass filter assemblies for solar telescopes

Details Narrow bandpass filter assemblies for solar telescopes Narrow bandpass filter assemblies for solar telescopes

2008-07-08

2008-07-08

Allen, Stephone B. (Department: 2872)

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

C359S589000, C359S260000, C359S261000

Reexamination Certificate

active

11415257

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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