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This presentation outlines a tunable narrow-passband filter system based on the MFPI concept using Triple Fabry-Perot Etalons for the Advanced Technology Solar Telescope (ATST). The optical layout and interface details for integrating the filter system with the telescope are discussed, along with technology development and estimated costs. The use of Fabry-Perot Etalons enables commensurate spectral resolution for achieving high-resolution imaging at 1/250 of the telescope resolution.
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