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Current location: Window
| Always we need a window with special flatness like lambda/2 to lambda/5 concave in our applications. For example, if we make dielectric mirror coating on a very flat window, after coating the flatness will be changed from very flat to a little convex, mainly because the deposited coating layers have big stress. Of course this change is not welcome. We have a solution to solve this problem. We can make the substrate a little concave before coating, then it will become very flat after coated as the stress work. |
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| Specifications |
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| Material |
BK7, UV grade fused silica |
| Dimension Tolerance |
+0.0/-0.2mm |
| Thickness Tolerance |
±0.2mm |
| Clear Aperture |
>90% |
| Parallelism |
Up to <5 arc seconds |
| Surface Quality |
Up to 20/10 scratch and dig |
| Flatness |
Like λ/2 to λ/3 concave, <λ/5 concave
or special flatness per your requirement | | | |
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