Double-concave Lenses


MaterialBK7, UVFS
Diameter Tolerance+0.0, -0.12 mm
Thickness Tolerance±0.5 mm
Centration<3arc minutes
Clear Aperture>90%
Surface Irregularityλ/8 @ 633 nm
Surface Quality40-20 scratch & dig
Paraxial focal length±2% @ 546 nm for BK7
±2% @ 355 nm for UVFS
AR CoatingsNone. Please refer to the Coatings Service
Double-concave Lenses are ideal for many applications with restricted imaging, as the biconvex lens has a convex spherical surface with equal radius of curvature on both the front and rear surfaces, giving the lens symmetry, minimising spherical aberration and eliminating wisps, aberrations and chromatic aberrations.

Double concave lenses are symmetrical with equal radius of curvature on both sides. The biconcave lenses are used in optical systems in combination with other lenses. These lenses also work as beamexpanders, optical character readers, viewers and projection systems. Lenses can be anti-reflection coated,please refer to the coating service.

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