Sellmeierligningene
Sellmeierligningene is a set of empirical equations used to describe the wavelength dependence of the refractive index in transparent materials, particularly optical glasses and crystals. Named after the German physicist Wolfgang Sellmeier, these equations provide a mathematical model to accurately predict how light propagates through various substances across different wavelengths.
The Sellmeier equations are typically expressed as a sum of terms involving resonant wavelengths, which correspond
n²(λ) = 1 + (B₁λ²) / (λ² - C₁) + (B₂λ²) / (λ² - C₂) + (B₃λ²) / (λ² - C₃)
where n(λ) is the refractive index at wavelength λ, and B₁, B₂, B₃, C₁, C₂, C₃ are material-specific
Sellmeier coefficients are obtained through precise measurements of refractive indices at various wavelengths, allowing for the
The Sellmeier equations are favored over simpler models because they provide a more accurate description of