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  • Bi-concave Lenses
  • Bi-concave Lenses

Bi-concave Lenses

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Specifications:

Type Bi-Concave Lenses Material BK7,UV FS, CaF2, ZnSe, Sapphire, BaF2 etc.
Clear Aperture >90% Diameter Tolerance +0.00/-0.1mm
Thickness Tolerance ±0.1mm Surface Irregularity λ/4 @ 633 nm (λ/8 optional)
Concentricity 3 arcmin Paraxial Focal Length +/-2%
Chamfer 0.2mm x 45 degree

Biconcave lenses has equal radii on both surfaces, the biconcave lenses are common used in laser beam expanders, optical character readers, viewers. And it is normally used in to increase focal lengths in optical systems and combination with other lenses. Custom biconcave lenses are provided upon customer’s request.