Double-Concave Lenses

The biconcave lenses are used in optical systems in combination with other lenses. These lenses also work as beam expanders, optical character readers, viewers and projection systems.

Technical Parameters:

Material
BK7, FS, UVFS, CaF2, ZnSe, Si, Ge
Wavelength
350-2000nm/185-2100nm
Dimension Tolerance
+0.0/-0.1mm

Thickness Tolerance
+/-0.1mm
Clear Aperture
Clear Aperture
Focal Length Tolerance
5%(Standard)/ 1%(High Precision)
Surface Quality
40/20(Standard)/ 20/10(High Precision)
Centration
<3 arc min
Coating
Upon customers' request