| Plano Concave Lenses | |
| Material | BK7 glass,UV grade fused silica,CaF2 |
| Working Wavelength | 350-2000nm for BK7 |
| 185-2100nm for Fused Silica | |
| Dimension Tolerance | +0/-0.2mm |
| Thickness Tolerance | ±0.2mm |
| Design Wavelength | 546.1nm |
| Surface Quality | 60/40 scratch and dig |
| Clear Aperture | >90% |
| Flatness | N<3(0.5)@632.8nm |
| Centration | <3 arc min |
| Focal Length Tolerance | ±2% |
| Chamfer | Protective <0.5mmx45° |
| Coating | According to your requirement. |
