| Technical Requirement | Commercial Grade | Precision Grade |
| Size Range | 1-600mm | 2-600mm |
| Diameter Tolerance | 土0.1mm | 土0.025mm |
| Thickness Tolerance | 土0.1mm | 土0.025mm |
| Parallel Deviation | ±3´ | ±10´´ |
| Surface Quality | 60-40 | 40-20 |
| Surface Accuracy | 1.0λ | λ/10 |
| Coating | 3-5μmOR 8-12μm T >97% | |
| Inverted Edge | 0.1-0.5mm*45° | |
| Material | Single Crystal Germanium | |
| Diameter (mm) | Thickness (mm) | Coating Requirements | Diameter (mm) | Thickness (mm) |
| 10 | 1 | AR/AR OR AR/DLC 3-5μm OR 8-12μm AR, <2% per Surface - | 75 | 3 |
| 12.5 | 1 | 75 | 5 | |
| 20 | 2 | 76.2 | 6 | |
| 25 | 3 | 80 | 8 | |
| 30 | 3 | 90 | 10 | |
| 38.1 | 3 | 100 | 10 | |
| 40 | 4 | 150 | 15 | |
| 50 | 3 | 180 | 18 | |
| 50.8 | 3 | 200 | 20 | |
| 63.5 | 5 | 300 | 35 |
| Density (g Cm-3) | 5.33 |
| Melting Point (℃) | 936 |
| Dielectric Constant Static / High Frame | 16.6 @ 9.37GHZ(300K) |
| Coefficient Of Thermal Expansion (1/℃) | 6.1*10-6 @298K |
| Bulk Elastic Modulus (gpa) | 77.2 |
| Shear Modulus (gpa) | 67 |
| Thermal Conductivity (j/k .m. S) | 58.61 @ 293K |
| Heat Capacity (j/g .k) | 0.31 |
| Knoop Hardness (kg/mm2) | 780 |
| Young's Modulus (gpa) | 102.7 |
| Poisson's Ratio | 0.28 |
| Elastic Coefficient | C11=129 C11=48.3 C11=67.1 |
| Transmission Wavelength Range | 2000nm—12000nm |
| Absorption Coefficient (1/cm) | 1. 1.3*10-3 @ 3800nm |
| 2. 3*10-2 @ 10600nm | |
| Thermooptic Coefficient , Dn/dt (1/k) | 4.08*10-4 @10600nm |
| Wavelength (nm) | Refractive Index (n) | Wavelength | Refractive Index | ||
| 2200 | 4.0879 | 8000 | 4.0057 | ||
| 3000 | 4.0451 | 9000 | 4.004 | ||
| 3800 | 4.0267 | 10600 | 4.0028 | ||
| 5000 | 4.016 | 11000 | 4.0025 | ||
| 6000 | 4.0107 | 12000 | 4.0021 | ||
| 7000 | 4.0079 | 13000 | 4.0018 | ||
| Technical Requirement | Tolerance Range | ||||
| Size Range | 1-400mm | ||||
| Dimensional Tolerance | +0/-0.05mm | ||||
| Angular Tolerance | ±2”-±5’´ | ||||
| Surface Quality | 10/5 | ||||
| Surface Accuracy | λ/10 per @633nm | ||||
| Inverted Edge | 0.1-0.5mm | ||||
| Material | Germanium (Ge) single crystal | ||||
| Coating | 8-14 microns or 3-5 microns | ||||
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