Coating Impact on Flatness Calculator

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Description

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.

R	Radius of Curvature [µm]
D	Substrate Diameter [µm]
E_s	Substrate Elasticity Modulus [Pa]
E_c	Coating Elasticity Modulus [Pa]
t_s	Substrate Thickness [µm]
t_c	Coating Thickness [µm]
v_s	Substrate Poisson’s Ratio (unitless)
v_c	Coating Poisson’s Ratio (unitless)
σ	Coating Stress (MPa)
SF₁	Surface Flatness Before Coating (waves or µm)
SF₂	Surface Flatness After Coating (waves or µm)

Coating Impact on Flatness Calculator

Surface Flatness Before Coating, SF1:

Wavelength for Flatness Specification (nm):

Substrate Thickness, t_s (mm):

Substrate Diameter, D (mm):

Substrate Material:

Coating Type:

Coating Technology Used:

Description

Related Resources and Capabilities

Coating Impact on Flatness Calculator

Surface Flatness Before Coating, SF1:

Wavelength for Flatness Specification (nm):

Substrate Thickness, ts (mm):

Substrate Diameter, D (mm):

Substrate Material: Fused Silica BK7 SF11 Borofloat Gorilla Glass Sapphire Silicon Germanium MgF2 ZnSe ZnS

Coating Type: Anti-Reflective (AR) Highly-Reflective (HR)

Coating Technology Used: E-Beam/IAD Sputtering

Description

Related Resources and Capabilities

Substrate Thickness, t_s (mm):

Substrate Material:

Coating Type:

Coating Technology Used: