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Plano-Concave Lens

A plano-concave lens is compose of a plane and concave surface, has a negative focal length and negative spherical aberration, which often can be used to expand beam or increase focal length, and balance out aberrations of other lenses in the system. The used materials include BK7, SF11, UV-fused silica, and CaF2,etc.
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Materials:BK7, Fused Silica,Ge,Si, CaF2...
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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