|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|
While the spherical aberrations of traditional spherical lenses, the aspherical lens with non-spherical surface are designed to reduce it in lasers and imaging. Aspheric lenses can increase the numerical aperture of a lens while minimizing system aberrations and reduce the number of elements needed in a multi-elements system, in somehow replacing a multi-lens system with a single aspheric lens.
The lenses are made from precision CNC grinding and polishing machine, diamond turning machine and glass molded processing , substrate materials: BK7, Fused silica and other optical glass materials, infrared materials Germanium, ZnSe and Silicon could be used. Hangzhou Shalom EO provide the custom aspherical lenses upon customer’s request.