- For the windows and lenses of IR filter, CO2 Laser and infrared imaging systems
- Maximum Diameter: Ø300mm for single crystal; 380mm for polycrystal
- Various shape: rod, disc, rectangle, lenses, etc
Product Properties
| Germanium | |
|---|---|
| Refractive Index(@10μm) | 4.0026 |
| Homogeneity of Refractive Index | ≦1.0×10-4 （Φ250mm） |
| Bulk Absorption Coefficient(@10μm,cm-1) | ≦0.03 |
| Rupture Modulus(Mpa) | ≧75 |
Technical Index
| Germanium | |
|---|---|
| Transparent region (μm) | 1.8—23 |
| Hardness (kg/mm2 ) | 800 |
| Density(g/cm3) | 5.33 |
| Yonug’s Modulus(Gpa) | 103 |
| Thermal Conductivity(Wcm-1k-1) | 59 |
| Thermal Expansion Coefficient(/℃) | 6.1×10-6 |
| Posson ratio | 0.28 |
| Melting point(/℃) | 937 |
| Specific heat (Cal/g.k.) | 0.074 |
| Dielectric constant | 16 |
| Resistivity (Ωcm) | 0.01–50 |
the listed index are from reference book, may be different from our products, more special requirements should be discussed individually.
Specification
| Monocrystalline and polycrystalline cylinder blanks | |
|---|---|
| Largest Diamester(mm) | 300（mono-crystalline） 380（polycrystalline） |
| Tolerance on diameter | standard 0.1mm; limit 0.03mm |
| Thickness | minimum 0.8mm,maximum: depends on the diameter, |
| Example | for Φ25mm，max length 600mm; Φ200mm,max.length 200mm |
| Tolerance on thickness | Standard:0.1mm,limit:0.05mm(thickness ≦40mm) |
| Monocrystalline and polycrystalline rectangular blanks | |
| Maximum dimensions | 200*200mm |
| Tolerance on these dimensions | 0.1mm |
| Minimum thickness | depend on the dimensions，example for diagonal≦150mm，thickness≧2mm； |
| Tolerance on thickness | standard 0.1mm(thickness≦100mm) |
| Spherical generated lens | |
| Diameter | from 15 to 200mm |
| Tolerance on diameter | standard 0.1mm; limit 0.03mm |
| Tolerance on curvatures | standard0.5%; limit 0.05% |
| Tolerance on center thickness | standard0.1mm; limit 0.05mm |
| Special shapes | |
| Monocrystalline and polycrystalline prisms Monocrystalline and polycrystalline tapers |
|
This table just show the general specification of our products, more special requirements could be discussed individually.