Chang,Liang

YNAO,CAS

changliang@ynao.ac.cn

July 09-10,2011

Fore Parts of Optical Design Scheme of FASOT

(from telescope to spectrograph)

o-beam

e-beam

1. Optical Configurations

Telescope Diameter:800mm,Focal ratio:F/10,

FOV:1.5arcmin(30 arcsec?? or 22.5arcsec??),0.75 arcsec/fiber

Ordinary beam 1600 fibers/4 units, each unit:400 fibers

Extraordinary beam 1600 fibers/4 units, every unit:400 fibers

Monitor system

2. Telescope

Diameter: 800mmThickness of primary mirror: 80mmClear Aperture of secondary mirror:230mm ， Thickness of secondary mirror :23mm ，Focal ratio: F/10,FOV, 1.5arcmin, (The first phase of the project is 30 arcsec or 22.25arcsec??)Image size on telescope focal plane:1.5 arc min: 3.45mm ， 30arcsec:1.163mm Wavelength Range: 600-1100nm ，Windows material: K9 or N-BK7Primary/Secondary mirror: zerodur with aluminum coating

Airy disc

2. Amplifying System

Amplifying System??=Collimator+Image Lens

For 0.75”,telescope image size is 29.089um Single Lenslet size is 200umMagnification times=6.875,(200/29.089)Collimator: f=240mm, Clear Apture=24.82mm @ 30”; 26.92mm @1.5’Image lens: f=1650.12mm ， Clear Apture=219.34mm @ 30”; 236.04mm @ 1.5Image quality at Lenslet surface@30” is 0.31”, better than 0.6” at 850nm;(80% energy in 0.6”)

Actual design is 224um @ 0.75”

should continue to be optimized

Angle between o-beam and e-beam is 10° ，Polarimeter clear apture: 25.54mm@ 1.5’ 25mm@30” ，

LASFN9

Length:0.5019mm

Fiber diameter?? 60um or 30um or 24um

THE END

Thanks