GaAs
Density：5.37g/cm^3
Refractive Index：3.3169@3μm；3.2770@10μm
Transmission：≥55%@3-5μm；≥55%@8-12μm
Resistivity：5×10^7-1×10^8Ω*cm
| 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″ |
