Sapphire
Density：3.98g/cm^3
Transmission：＞85%@633nm
Refractive Index：1.76@633nm
Thermal conductivity：27.21W/（m×k）@25℃
| Type | Size | Diagonal | Dia.-Thick Ratio | Surface Quality S/D | Flatness PV@632.8nm | Parallelism |
| Square | Small | 10-25mm | 10:1 | 10-5 | λ/4 | 1′ |
| Medium | 25-100mm | 10:1 | 40-20 | λ/2/φ25.4mm | 30″ | |
| Large | 100-150mm | 10:1 | 120-80 | λ/2/φ25.4mm | 30″ | |
| Type | Size | Diameter | Dia.-Thick Ratio | Surface Quality S/D | Flatness PV@632.8nm | Parallelism |
| Circular | Small | φ10-φ25mm | 10:1 | 10-5 | λ/4 | 1′ |
| Medium | φ25-φ100mm | 10:1 | 20-10 | λ/4/φ25.4mm | 30″ | |
| Large | φ100-φ150mm | 10:1 | 80-50 | λ/4/φ25.4mm | 30″ |
