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By certification 
Specifications
Material: optical glass, fused silica
Diameter: 0.5 – 5mm
Dimension tolerance: ± 0.02mm
Surface quality: 40/20 – 80/50 Scratch and dig
Surface accuracy: Lambda/2 – 2 Lambda @ 632.8nm
Centration: 3 arc minutes
Protective Bevel: allowed up to 0.1mm
AR Coating: Upon request
Material: optical glass, fused silica
Diameter: 0.5 – 5mm
Dimension tolerance: ± 0.02mm
Surface quality: 40/20 – 80/50 Scratch and dig
Surface accuracy: Lambda/2 – 2 Lambda @ 632.8nm
Centration: 3 arc minutes
Protective Bevel: allowed up to 0.1mm
AR Coating: Upon request
