1. Optical Feed of Coudé Instruments David 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 nm
NIRSP 900nm nm
VBI blue
ViSP
VTF
VBI red
NIRTF
NIRSP-C

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

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