Biconcave Lens
A double concave lens/mirror has a negative focal length, thereby causing collimated incident light to diverge. The double concave lens/mirror has an equal radius of curvature on both sides of the lens. They are generally used to expand light or increase focal length in the existing system, such as beam expander and projection systems.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Material | Optical glass/ Fused silica/ sapphire etc. |
| Diameter | 2mm~300mm |
| Diameter Tolerance [≤50mm] | ±0.05mm(≤50mm) |
| Diameter Tolerance [＞50mm] | ±0.1mm(＞50mm) |
| Focal Length | -50mm~-2000mm |
| Focal Length Tolerance [＜10mm] | ±0.2%（＜10mm） |
| Focal Length Tolerance [＜10mm-1000mm] | ±0.5%（＜10mm-1000mm） |
| Focal Length Tolerance [＞1000mm] | ±1%（＞1000mm） |
| Center Thickness | 2mm~20mm |
| Surface Quality | 60/40, 40/20, 20/10 |
| Surface Accuracy [@632.8nm, 532nm] | λ/2~λ/10@632.8nm, 532nm |
| Clear Aperture | >85% |
| Center Deviation | <3arc min~ 30arc sec |
| Coating [According to customer requirements.] | According to customer requirements. |
Applications
Datasheet
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Supplier Information
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