ProductsOpticsWindowsAR-Coated Windows
IMTS Products
AR-Coarted Windows
Windows are frequently used in optical systems to separate the environment in one part of the system from another, such as to seal vacuum or high-pressure cells. Because the infrared transmitting material has a high index of refraction, an anti-reflection coating is typically applied to windows to minimize losses due to reflections.
For guidelines about calculating the proper thickness for a window to withstand a given pressure, see our Pressure Loading tutorial.
Below is the typical transmission of an AR coated, ZnSe window at 0° incidence:
Contact us for more information II-VI_opticsCatalog2007.pdf
Specs
| Spcifications | Standards |
| Dimensional Tolerance |
Diameter: +0.000"-0.005" Thickness: +0.005"-0.010" |
| Edge Thickness Variation (ETV) | <= 3 arc minutes |
| Clear Aperture (polished) | 90% of diameter |
| Surface Figure (power/irregularity) at 0.63µm | 1.0 fringe/0.5 fringe |
| Scratch-Dig | 20-10 |
| AR Coating Reflectivity per Surface at 10.6µm | < 0.20% |
| Part# | Description |
Diameter (inches) |
Diameter (mm) |
Thickness (inches) |
Thickness (mm) |
| 185217 | ZnSe | 0.25 | 6.35 | 0.080 | 2.03 |
| 568604 | ZnSe | 0.375 | 9.53 | 0.080 | 2.03 |
| 162879 | ZnSe | 0.50 | 12.7 | 0.080 | 2.03 |
| 457172 | ZnSe | 0.75 | 19.05 | 0.080 | 2.03 |
| 735199 | ZnSe | 1.0 | 25.4 | 0.080 | 2.03 |
| 617035 | ZnSe | 1.0 | 25.4 | 0.120 | 3.05 |
| 834076 | ZnSe | 1.1 | 27.94 | 0.120 | 3.05 |
| 184651 | ZnSe | 1.5 | 38.1 | 0.120 | 3.05 |
| 883636 | ZnSe | 2.0 | 50.8 | 0.200 | 5.08 |
| 243559 | ZnSe | 2.5 | 63.5 | 0.250 | 6.35 |
| 616847 | ZnSe | 3.0 | 76.2 | 0.250 | 6.35 |
