Optical Feed of Coudé Instruments David Elmore

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Presentation transcript:

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 Spectrographs need a telecentric feed

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

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

Solution VBI red WFS VTF NIRSP DM VBI blue NIRTF ViSP

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

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