Specifications    

Material: BK7 or UV fused silica    

Design Wavelength: 546.1nm    

Design Index:     
         BK7: 1.5183 ± 0.0005   
         Fused silica: 1.46008 ± 0.0005  
Diameter Tolerance: +0.0, -0.15mm    
Paraxial Focal Length: ± 2%      
Centration: 3 arc minutes    
Clear Aperture: > 80%    
Surface Irregularity: λ/4 @632.8nm    
Surface Quality: 60-40 scratch and dig     
Protective Bevel     

Other materials are also available.     
AR coating is available apon request.