CWL Shift due to AOI Changes Calculator (For Optical Filters)

Using below simulator, you can figure out a rough Center Wavelength Shift with different Angle of Incidence (AOI). 
  • AOI Should not be larger than 45deg
  • Center Wavelength should be from 350 - 10500nm
  • Effective Refractive Index are relevant with Coating Design. 
    > You can assume ri = 1.5-1.8 for regular coating design
    > You can assume ri = 2.0 - 2.3 for variable AOI coating design

Where:
  • λθ = wavelength corresponding to the feature of interest at incident angle θ\thetaθ
  • λ0 = wavelength corresponding to the feature of interest at normal incidence
  • n0 = refractive index of incident medium
  • neff = effective refractive index of the optical filter
  • θ = angle of incidence

 

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