Double-concave Lens         

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.