Sellmeier equation Totally Explained

Everything about Sellmeier Equation totally explained

In optics, the Sellmeier equation is an empirical relationship between refractive index n and wavelength λ for a particular transparent medium. The usual form of the equation for glasses is ť

n^2(lambda) = 1 
+ frac.

Here the coefficient A is an approximation of the short-wavelength (for example, ultraviolet) absorption contributions to the refractive index at longer wavelengths. Other variants of the Sellmeier equation exist that can account for a material's refractive index change due to temperature, pressure, and other parameters.

Coefficients

Table of coefficients of Sellmeier equation(External Link)
Material	B₁	B2	B₃	C1	C₂	C3
borosilicate crown glass (known as BK7)	1.03961212	2.31792344x10⁻¹	1.01046945	6.00069867x10⁻³µm²	2.00179144x10⁻²µm²	1.03560653x10²µm²
sapphire (for ordinary wave)	1.43134930	6.5054713x10⁻¹	5.3414021	5.2799261x10⁻³µm²	1.42382647x10⁻²µm²	3.25017834x10²µm²
sapphire (for extraordinary wave)	1.5039759	5.5069141x10⁻¹	6.5937379	5.48041129x10⁻³µm²	1.47994281x10⁻²µm²	4.0289514x10²µm²

Further Information

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