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Optical Feed of Coudé Instruments David Elmore

Optical Feed of Coudé Instruments David Elmore. Considerations. All visible/NIR coudé lab instruments require adaptive optics (AO) Most instruments require diffraction limited performance Non-common path between AO wave front sensor (WFS) and instruments needs to be minimized

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Optical Feed of Coudé Instruments David Elmore

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  1. Optical Feed of Coudé InstrumentsDavid Elmore

  2. Considerations • All visible/NIR coudé lab instruments require adaptive optics (AO) • Most instruments require diffraction limited performance • Non-common path between AO wave front sensor (WFS) and instruments needs to be minimized • Spectrographs need a telecentric feed

  3. Considerations continued • Simultaneous operation of instruments from Instrument Science Requirements Documents VBI : Visible Broadband Imager ViSP: Visible Spectro-polarimeter VTF: Visible Tunable Filter NIRSP: Near Infrared Spectro-polarimeter

  4. Considerations continued • Dichroic coatings that reflect short wavelengths have better performance than those reflecting long wavelengths • VBI blue 380nm - 550nm • ViSP 380nm - 900nm (1080nm, 1600nm) • VTF 550nm - 860nm • VBI red 650nm - 860nm • NIRTF 850nm - 1080nm • NIRSP 900nm - 2200nm VBI blue ViSP VTF VBI red NIRTF NIRSP-C

  5. Solution VBI red WFS VTF NIRSP DM VBI blue NIRTF ViSP

  6. What next • With assistance of instrument builders • Insert ‘real’ instruments • Design appropriate feed optics

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