Double Concave Lenses

Biconcave lenses

Double concave lenses(also called bi-concave lenses) are spherical glass lenses which have spherical concave surfaces on both sides, with negative focal lengths. Bi-concave lenses are used in beam expansion, image reduction, or light projection applications and etc.

As a professional manufacturer, supplier and exporter of double concave or bi-concave lenses here in China, PBL Optics can make custom double concave lenses for the specific application of your imaging system. If you want to buy them, let’s discuss your application.

A wide variety of  double concave or bi-concave lenses are for sale.

Glass material: N-BK7,Fused Silica,N-SF11,CaF2,ZnSe and etc

Effective Focal Length Tolerance: ± 1%

Surface Quality:60/40,40/20 (scratch&dig)

Diameter Tolerance: +0.0, -0.2mm

Clear Aperture: ≥ 90% of Diameter

Centering Tolerance : ≤3 arc min

Coating :Uncoated / Single layer MgF2

N-BK7 and N-SF11 Double Concave Lenses(Uncoated)
Item numberDiameter(mm)Focal length(mm)Radius of curvature(mm)Centre thickness(mm)Edge thickness(mm)
BCC16.0-6.0–9.71.52.5
BCC29.0-9.0-14.42.03.4
BCC312.7-50.0-52.13.54.3
BCC425.4-50.0-52.03.06.1
PCX525.025.413.111.72.5
Fused Silica Double Concave Lenses(with 245-400nm AR coating)
Item numberDiameter(mm)Focal length(mm)Radius of curvature(mm)Centre thickness(mm)Edge thickness(mm)
BCC66.0-12-11.53.03.8
BCC79.0-18.1-17.03.04.2
BCC812.7-15.0-14.33.06.0
BCC925.4-50.2-46.63.57.0