BaF2
Density：4.88g/cm^3
Transmission：＞90%@0.13-12.5μm
Homogeneity：5×10^-6
Cleavage plane：<111>
| Type | Size | Diagonal | Dia.-Thick Ratio | Surface Quality S/D | Flatness PV@632.8nm | Parallelism |
| Square | Small | 10-25mm | 10:1 | 20-10 | 1λ | 1′ |
| Medium | 25-100mm | 10:1 | 60-40 | 1λ | 30″ | |
| Large | 100-200mm | 10:1 | 80-50 | 1λ/φ100 | 3″ | |
| Type | Size | Diameter | Dia.-Thick Ratio | Surface Quality S/D | Flatness PV@632.8nm | Parallelism |
| Circular | Small | φ10-φ25mm | 10:1 | 20-10 | 1λ | 1′ |
| Medium | φ25-φ100mm | 10:1 | 60-40 | 1λ | 30″ | |
| Large | φ100-φ200mm | 10:1 | 80-50 | 1λ/φ100 | 3″ |
