Thin Film Interference Calculator

Calculate interference conditions in thin films like soap bubbles and optical coatings

Film Thickness (nm):

Film Refractive Index:

Wavelength (nm):

Incident Angle (degrees):

Substrate Refractive Index:

Optical Path Difference: 2nt·cos(θ')

Phase shift on reflection: π if reflecting from higher-n medium

Constructive: OPD = mλ or (m+1/2)λ depending on phase shifts