Bi-Concave Lenses
A biconcave lens refers to a lens with concave surfaces on both sides. It has a negative focal length and can diverge light beams, thus being used in optical systems for beam expansion, light projection and extending the focal length of optical systems.
Details
Applications
Display systems, Projection systems, Laser measurement, Optical imaging, Beam control and other fields.
Customization Parameters
Specification | Common precision | High precision |
Diameter | 3mm~300mm or larger | |
Material | K9, BK7, FS, UVFS, CaF2, ZnSe, Si, Ge; | |
Diameter tolerance | +0.0/-0.2 mm | +0.0/-0.1 mm |
TC tolerance | ± 0.3 mm | ± 0.1 mm |
Clear aperture | >85% | >90% |
Surface quality | 60-40 S-D | 40-20, 20-10 S-D |
Surface flatness | 1λ@632.8nm | 1/4 λ @632.8nm |
Centration | ±3 arc min | ±1 arc min |
Note: All dimensions & coatings customizable upon request.
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