Programmable Dispersion Function

The accurate definition of the optical para-meters of materials, such as the refractive index, is a necessity for the modeling of any optical system. One handy option to specify the wavelength-dependent index of refraction are so-called dispersion formulas, which typically provide the data over a large spectral range just by defining a manageable number of coefficients. VirtualLab Fusion is shipped with a wide selection of commonly used dispersion formulars (e.g. Sellmeier, Cauchy), but also allows for an easy programming of additional types. In this document, the programming of a dispersion formula is shown at the example of the glass GOST BK9 by applying the Reznik definition.