|Material||BK7, fused silica, optical glass, Ge, ZnSe, Silicon||Surface Quality||10/5 S/D to 40/20 S/D (uncoated)|
|Clear Aperture||>90%||Diameter Range||5-280mm|
|Diameter Tolerance||+0.0/-0.05mm||Protective Chamfers||0.3mm max@45°|
|Center Thickness Tolerance||≤0.05mm||EFL Tolerance||≤0.1%|
|Asphere Figure Error P-V||±1 µm||Surface Form Deviation RMS||≤0.5 µm|
Aspheric lens with non-spherical surface is designed to reduce spherical aberration of traditional spherical lens in lasers and imaging. Aspheric lenses can increase the numerical aperture of a lens while minimizing system aberrations and reducing the number of elements needed in a multi-elements system, by somehow replacing a multi-lens system with a single aspheric lens.
The lenses are made by precision CNC grinding and polishing machine, diamond turning machine and glass molded processing . Substrate materials including BK7, Fused silica and other optical glass materials, infrared materials Germanium, ZnSe and Silicon could be offered according to customer's option. Hangzhou Shalom EO provides custom aspheric lenses upon customer’s request.