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An Introduction to the FGS-TFI: The T unable F ilter I mager

JWST FGS. An Introduction to the FGS-TFI: The T unable F ilter I mager. Alex Fullerton STScI / HIA. STScI Training for Data Analysts 2008 January 15. Optical Layout of the FGS-TFI. 2048 2048 HgCdTe 5.2 micron cut-off 18 micron pixels. FGS Optical Assembly – TFI Side.

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An Introduction to the FGS-TFI: The T unable F ilter I mager

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  1. JWST FGS An Introduction to the FGS-TFI:The Tunable Filter Imager Alex Fullerton STScI / HIA STScI Training for Data Analysts 2008 January 15

  2. Optical Layout of the FGS-TFI 20482048 HgCdTe 5.2 micron cut-off 18 micron pixels

  3. FGS Optical Assembly – TFI Side

  4. Fabry-Perot Etalons Optical path difference = 2µl cos Phase difference = (2/) 2µl cos + r m = 2µl cos + r /2 Tuning: For fixed m, on-axis (=0) l Detuning: For fixed m, l, off-axis ()  cos   1  2/2 µ=index of refraction

  5. Etalon Coating Design (17 Layers) m = 3 m = 1 SHORT 1500 to 2600 nm ~55 filters LONG 3000 to 5000 nm ~51 filters

  6. Pupil and Filter Wheels FLAT Lamp Blocking Filters LINE Lamp CLEAR

  7. NIRCam bandpass TFI bandpass Key Performance Requirements • Wavelength Selection Flexibility • Good Sensitivity for Emission Line Objects • Emission Line Diagnostic Imaging • Coronagraphy: Extrasolar • Planets, Brown Dwarfs

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