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Double Concave Lens

Double Concave, in similar cased, still known as bi-concave lens. The same optical property with the plano-concave lens. PHYO OPTICS supply double concave lens by N-BK7,Fused Silica,CaF2,SF11,H-BaK4,H-BaK7,etc, used as 190-2100nm based on different optical material and coating



SpecificationCommercialHigh Precision
MaterialAs Required Schott,CDGM.etc.As required Schott, CDGM,etc.
Diameter Tolerance+0.00/-0.20mm+0.00/-0.05mm
Focual Length ToleranceTypical +/-5%@633nmTypical +/-2% @633nm
CentrationTypical <3arcminTypical <3arcmin
Surface Flatness@632.8nmL/4L/8
Surface Quality80-5040-20
Bevel0.2-0.50.05-0.2
CoatingAs required, with paint, Protection coating, high precision
 * Glued lens like Archromatic, triplet are still available
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