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Double-Concave Lens

A double-concave lens is compose of two concave surface, has a negative focal length and are best used to diverge a converging beam. Similar to a plano-concave lens, a bi-concave lens can diverge a collimated beam to a virtual focus like a beam expander.
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Specifications:
Materials:BK7, Fused Silica,Ge,Si, CaF2...
Diameter:1.5—300mm
Diameter Tolerance:+/-0.02 mm
Thickness Tolerance:0+/-0.02mm
Centring Error<3 Arc minute
Surface Quality:20—10
Surface Figure:λ/10@633nm 
Clear Aperture:90%
Coating: Specified by customers 
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