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.
Product parameter
| Materials | Optical glass, quartz, infrared materials (calcium fluoride, zinc selenide, silicon, germanium) |
| Diameter Range | φ1-450mm |
| Contour tolerance | 0/-0.1 |
| Thickness Tolerance | ±0.03 |
| Surface Quality | 20-10 |
| Surface Flatness | N≤1, △N≤0.2 |
| Center | 15 seconds |
| Chamfer | ≤0.1 |
| Clear Aperture | > 90% |
| Coating | According to customer requirements |
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