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Current location: Lenses&Mirrors
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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