Double-Concave Lenses (BK7 or Fused Silica)

Optics >>> Lens >> Double-Concave Lenses

Double-Concave lenses are most suited to produce diverging light or a virtual image where the input light is converging. 

BK7 Double-Concave Lenses

Main Specifications  
Material BK7 grade A optical glass
Design Wavelength 546.1nm
Design Index 1.5183 0.00005
Diameter Tolerance -0.0, -0.15mm
Paraxial Focal Length 2%
Centration < 3 arc minutes
Clear Aperture >85%
Surface Figure l/4@632.8nm
Surface Quality 60-40 scratch and dig
Bevel 0.25 mm x 45

Fused Silica Double-Concave Lenses

Main Specifications  
Material UV graded Fused Silica
Design Wavelength 546.1nm
Design Index 1.46008 0.00005
Diameter Tolerance -0.0, -0.15mm
Paraxial Focal Length 2%
Centration <3 arc minutes
Clear Aperture >85%
Surface Figure l/4@632.8nm
Surface Quality 60-40 scratch and dig
Bevel 0.25 mm x 45
 

   

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