Double-concave lenses have two inward curved surfaces. AR coated double concave lenses have a negative focal length, so they are used for image reduction or to spread the light We offer anti-reflection coating for double-concave lenses, these coatings are available from us, MgF2 AR coating, and VIS 0°. We can also offer reflective coating for the concave surface.
Custom Made Capabilities,
| Substrate | N-BK7, H-K9L, UV fused silica glass, H-ZF1 and IR optical glasses, etc. |
| Dia. tolerance | +/-0.05mm |
| Thickness | +/-0.05mm |
| Surface quality | 20/10 or better |
| Surface flatness | Lambda/4 or better |
| Centering | 1 arc min |
| Bevel | Protective bevel |
| Coating | Anti-reflective coating at different wavelengths, R<0.5% |
| RoHS | certificated |
|
Dia. |
Material |
FL |
C.T. |
ROC |
|
12.7mm |
K9 |
25mm |
3.2mm |
-26.3mm |
|
12.7mm |
K9 |
200mm |
2mm |
-259.7mm |
|
25.4mm |
K9 |
125mm |
4.1mm |
-130.2mm |
|
25.4mm |
K9 |
400mm |
3.6mm |
-415.5mm |
We offer custom made double concave lenses to your drawings or specifications.
