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By certification 
Material:optical glass ,fused silica
Diameter Ellipticity:0/-0.005mm
Diameter tolerance:0/-0.005mm
Surface accuracy:1/2λ—2λ
Surface quality:60—40scratch and dig
Clear aperture:90％
Coating:avaliable upon request
Diameter Ellipticity:0/-0.005mm
Diameter tolerance:0/-0.005mm
Surface accuracy:1/2λ—2λ
Surface quality:60—40scratch and dig
Clear aperture:90％
Coating:avaliable upon request
