Products Navigation
 
Current location: Lenses&Mirrors
Special Flatness 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.
 
 
Specifications
 
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

Copyright © 2000 JG InterNational All rights reserved.Sitemap