The calculator is based on the following assumptions:
Mechanical properties of coating materials are averaged from the bulk values
Coating stress for a particular coating technology is approximated from historical data
Stress-induced deformation is assumed to be spherical
It is assumed that R >> D
Many modern-day optical coating technologies, such as magnetron sputtering and ion beam sputtering, involve high-energy material deposition. While these techniques can create coatings with distinct advantages, they can impart a significant amount of stress on the coating and substrate. This stress can lead to issues with surface flatness, impacting the transmitted or reflected wavefront error of coated optics.
This calculator approximates the impact of coating-induced stress on the surface flatness of a coated optic.
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