For diverging light Double-Concave Lenses

Double concave lens is the most common form of Negative lens. Negative lens is most suited to producing diverging light or a virtual image, where the input light is converging.



Pictures and drawings of Double-Concave Lenses:



Specifications:

Material:
BK7, Fused Silica, SF10, CaF2, Sapphire .etc.
Paraxial Focal Length Tolerance:
±2%
Dimension Tolerance:
±0.2(General). ±0.05(High Precision)
Centration:
<3 arc min
IRR:
λ/4@633nm(General),λ/10@633nm(High Precision)
Clear Aperture:
>80%(Small Size), >95%(Laege Size)
Surface Figure
<1.5λ@633nm(General),<λ/4@633nm(High Precision)
Surface Quality:
60/40(General),10/5(High Precision)
Bevel:
<0.25mm
Coating:
Uncaoted, AR,PR, HR, etc.


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