ZnS MS Window
| Machinable shape | Circle, rectangle, polygon and other shapes |
| Size range | Diameter (maximum diagonal)：Φ8-Φ300mm |
| Thickness：0.05-50mm | |
| Facial type | Reflected PV better than 1/4 λ， Transmission PV is better than 1/10 λ |
| Fineness | 10-5 20-10 40-20 |
| Surface roughness | <5nm |
| Parallelism | <20″ |
| Coating | Customized according to customer requirements |
Physical Properties
| ZnS | ZnSMS | |
| Density（ g/cm3） | 4.09 | 4.09 |
| Melting point（℃） | 1827 | 1827 |
| Resistivity Ω.CM | ~10^12 | ~10^13 |
| Purity（%） | 99.9996 | 99.9996 |
| Coefficient of thermal expansion（1/℃） | 6.6*10^-6@273K | 6.3*10^-6@273K |
| 7.3*10^-6@373K | 7.0*10^-6@373K | |
| Thermal conductivity（J/k.m.s） | 16.7@298K | 27.2@298K |
| Heat capacity（J/g.k） | 0.469@298K | 0.515@298K |
| Hardness (knoop) (kg/mm2) | 200-235 | 160 |
| Bending strength（MPa） | 103 | |
| Young’s modulus (GPa) | 74.5 | 74.5 |
| Poisson's ratio | 0.29 | 0.28 |
Optical Properties
| ZnS | ZnSMS | |
| Through wavelength range | 1000nm-14000nm | 370nm-14000nm |
| Refractive index inhomogeneity （ΔN/N） | ＜7.3*10^-4@10600nm | ＜0.2*10^-4@632.8nm |
| Absorption coefficient （1/cm） | 0.2@10600nm | 0.2@10600nm |
| Thermo-optic coefficient，dn/dT（1/K，298-358K） | 4.6*10^-5@1150nm | 5.43*10^-5@632.8nm |
| 4.3*10^-5@3390nm | 4.21*10^-5@1150nm | |
| 4.1*10^-5@10600nm | 3.87*10^-5@3390nm |
Change of refractive index with wavelength ( ZnS 20℃)
| Wavelength (nm) | Refractive index (n) | Wavelength (nm) | Refractive index (n) |
| 620 | 2.355 | 9800 | 2.203 |
| 1000 | 2.292 | 10600 | 2.192 |
| 3800 | 2.253 | 11400 | 2.180 |
| 5000 | 2.246 | 12200 | 2.167 |
| 7000 | 2.232 | 13800 | 2.132 |
| 9000 | 2.212 | 14200 | 2.126 |
Change of refractive index with wavelength ( ZnS 20℃)
| Wavelength (nm) | Refractive index (n) | Wavelength (nm) | Refractive index (n) |
| 400 | 2.545 | 8000 | 2.223 |
| 1010 | 2.292 | 9000 | 2.213 |
| 2060 | 2.264 | 10000 | 2.201 |
| 3500 | 2.255 | 11250 | 2.183 |
| 4500 | 2.250 | 12000 | 2.171 |
| 5000 | 2.247 | 13000 | 2.153 |
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