CVD Zinc selenide (ZnSe) optical window
CVD zinc selenide is a chemically inert material with high purity, strong environmental adaptability, and easy processing. Its light transmission loss is small and it has good light transmission performance. It is the preferred material for high-power CO2 laser optical components. Because of its uniform and consistent refractive index, the material is also ideal for protecting windows and optical components in forward-looking infrared (FLIR) thermal imaging systems. At the same time, the material is also widely used in windows and lenses in medical and thermal radiation measuring instruments and infrared spectrometers.
Zinc selenide is a very good infrared material. It has a wide light transmission range from 0.5 microns to 19 microns. Because of its good imaging and thermal shock characteristics, it is often used as the lens and window of carbon dioxide laser.
light transmission range: 500nm ~ 19000nm.
coefficient of thermal expansion: 7.6×10-6/k.
density: 5.27g/cm3
Zinc Selenide ZnSe Flat Window Processing Technical Parameters
| Items | Parameters |
|---|---|
| Material | Zinc selenide (ZnSe) |
| Processable shapes | Circles, rectangles, polygons and other shapes |
| Diameter | 3mm-500mm ± 0.1mm |
| Center thickness tolerance | 0.05mm-50mm± 0.05mm (we can process to ± 0.01mm with high precision) |
| Surface accuracy | Reflection PV ＞ 1/4λ, transmission PV ＞1/10λ |
| Surface quality | 10-5 20-10 40-20 |
| Surface roughness | ＜5nm |
| Center deviation | ＜20″ |
| Effective caliber | ≥90% |
| Coating | According to the custom requirements |
Physical and Chemical Properties of Zinc Selenide Materials
- Density (g/cm3): 5.27
- Melting point (℃): 1525
- Resistivity Ω.CM: ~10^12
- Chemical purity (%): 99.9996
- Thermal expansion coefficient (1/℃): 7.1*10^-6@273K; 7.8*10^-6@373K; 8.3*10^-8@473K
- Thermal conductivity (J/k.m.s): 18.0@298K
- Heat capacity (J/g.k): 0.339@298K
- Knoop hardness (kg/mm2): 110
- Bending strength (MPa): 55
- Young's modulus (GPa): 67.2
- Poisson's ratio: 0.28
Optical Properties of Zinc Selenide Materials
- Pass wavelength range: 500nm-22000nm
- Refractive index non-uniformity (ΔN/N): <3*10^-6@632.8nm
- Absorption coefficient (1/cm): 5.0*10^-3@1300nm 7.0*10^-4@2700nm 4.0*10^-4@3800nm 4.0*10^-4@5250nm; 5.0*10^-4@10600nm
- Thermo-optical coefficient, dn/dT (1/K, 298-358K) 1.07*10^-4@632.8nm 7.0*10^-5@1150nm 6.2*10^-5@3390nm 6.1*10^-5@106000nm
Changes in Refractive Index of Zinc Selenide Materials with Wavelength
| Wavelength (nm) | Refractive index (n) | Wavelength (nm) | Refractive index (n) |
|---|---|---|---|
| 620 | 2.5994 | 1000 | 2.4892 |
| 3800 | 2.4339 | 5000 | 2.4295 |
| 7000 | 2.4218 | 9000 | 2.4122 |
| 10600 | 2.4028 | 13000 | 2.3850 |
| 14600 | 2.3705 | 16600 | 2.3487 |
| 17800 | 2.3333 | 18200 | 2.3278 |
Optical Window Materials Quick Selection Guide
| Wavelength range | Window material |
|---|---|
| 180 nm - 8.0 μm | Calcium Fluoride CaF2 |
| 185 nm - 2.1 μm | UV fused silica UVSF |
| 200 nm - 5.0 μm | Sapphire |
| 200 nm - 6.0 μm | Magnesium Fluoride MgF2 |
| 600 nm - 16 µm | Zinc selenide ZnSe |
| 1.9 - 16 μm | germanium single crystal Ge |
| 2 - 5 μm | Barium Fluoride BaF2 |
Zinc Selenide Znse CVD Flat Window Stock
| Diameter (mm) | Thickness (mm) | Coating |
|---|---|---|
| 12.5 | 3 | Coated AR Ravg＜1.5%@8-12μm or not |
| 12.7 | 3 | Coated AR Ravg＜1.5%@8-12μm or not |
| 25 | 5 | Coated AR Ravg＜1.5%@8-12μm or not |
| 25.4 | 5 | Coated AR Ravg＜1.5%@8-12μm or not |
| 40 | 5 | Coated AR Ravg＜1.5%@8-12μm or not |
| 50 | 5 | Coated AR Ravg＜1.5%@8-12μm or not |
In addition, We can customize the optical window according to customer requirements or drawings.
For details, please consult:
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