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These ultra-high vacuum (UHV) viewports employ window materials such as Zinc Selenide, Magnesium Fluoride and Calcium Fluoride. All-metal-sealed, extended-range optics are available in 1 inch and 2 inch view diameters with a combined transmission range of 120nm to 20 microns. Coatings which enhance the transmission performance of many of these viewports are offered as standard options. Many nonstandard materials, coatings and optical specifications may be reviewed and quoted to meet custom application requirements.
Zinc Selenide (ZnSe) Specifications
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| Leak Rate: |
<2x10(-10) atm cc/sec He |
| Parallelism: |
<3 Arc Minutes |
| Flange Material: |
304/316 Stn. Stl. |
| Flatness: |
l /4@ 632 nm Transmitted Wavefront |
| Surface Finish: |
40/20 Scratch/Dig |
| Thermal Range: |
-100°C to 200°C |
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Operating Conditions
The thermal ratings specified are safe operating limits determined by various factors including material properties, mechanical design, and the intended operating environment. Temperature ratings for various mounting options may reduce the operating range of a window assembly. All assemblies have a maximum thermal gradient of 25ºC per minute and may be damaged if this limit is exceeded. |
Calcium Fluoride (CaF2) Specifications
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| Leak Rate: |
<2x10(-10) atm cc/sec He |
| Parallelism: |
<3 Arc Minutes |
| Flange Material: |
304/316 Stn. Stl. |
| Flatness: |
l /4@ 632 nm Transmitted Wavefront |
| Surface Finish: |
20/10 Scratch/Dig |
| Thermal Range: |
-100°C to 200°C |
|
 |
Operating Conditions
The thermal ratings specified are safe operating limits determined by various factors including material properties, mechanical design, and the intended operating environment. Temperature ratings for various mounting options may reduce the operating range of a window assembly. All assemblies have a maximum thermal gradient of 25ºC per minute and may be damaged if this limit is exceeded.
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Magnesium Fluoride (MgF2) Specifications
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| Leak Rate: |
<2x10(-10) atm cc/sec He |
| Parallelism: |
<3 Arc Minutes |
| Flange Material: |
304/316 Stn. Stl. |
| Flatness: |
l /4@ 632 nm Transmitted Wavefront |
| Surface Finish: |
20/10 Scratch/Dig |
| Thermal Range: |
-100°C to 200°C |
|
 |
Operating Conditions
The thermal ratings specified are safe operating limits determined by various factors including material properties, mechanical design, and the intended operating environment. Temperature ratings for various mounting options may reduce the operating range of a window assembly. All assemblies have a maximum thermal gradient of 25ºC per minute and may be damaged if this limit is exceeded. |
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