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| BiConcave lenses have a negative focal length
and are commonly used to increase the divergence of converging
light. With two concave surfaces, a BiConcave lens is more divergent
than a plano concave lens if the radius of curvature for all the
curved surfaces on both lenses is the same. |
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| This is the general standards we offer our customers, UNION OPTICS can supply other lenses meet your requirements, for detail information, please contact us. | ||
| BiConcave Lens | ||
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| Material: | BK7, Fused Silica | |
| Dimension Tolerance: | +0/-0.1mm | |
| Thickness Tolerance: | ±0.1mm | |
| Surface Quality: | 40/20 scratch and dig | |
| Flatness: | λ/4@632.8nm | |
| Centration: | <3 arc min | |
| Focal Length Tolerance: | ±1% | |
| Clear Aperture: | >90% | |
| Bevel: | 0.2mmX45deg | |
| Coating: | As requested | |
BiConvex lens  Achromatic lens |
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| Note: Usually, the material we used is Chinese material unless assigned. If you can not confirm which material is the right one, please contact us. | ||