1. Chang,Liang YNAO,CAS changliang@ynao.ac.cn July 09-10,2011 Fore Parts of Optical Design Scheme of FASOT (from telescope to spectrograph)

2. 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

3. 2. Telescope Diameter: 800mm Thickness of primary mirror: 80mm Clear 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-BK7 Primary/Secondary mirror: zerodur with aluminum coating Airy disc

4. 2. Amplifying System Amplifying System??=Collimator+Image Lens

5. For 0.75 ”,telescope image size is 29.089umSingle Lenslet size is 200um Magnification 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 @ 1.5 Image 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 ” ，

6. LASFN9 Length:0.5019mm Fiber diameter?? 60um or 30um or 24um

7. THE END Thanks