User-defined Material  (Sellmeier for n, Urbach for k)
USER
0 1
(An+Bn*Wvl^2/(Wvl^2-Cn^2)+Dn*Wvl^2/(Wvl^2-En^2))^0.5
Fn*Wvl*exp(-Gn*(1/Hn-1/Wvl))
An 3.563600
Bn 0.000000
Cn 0.000000
Dn 0.457663
En 2738.260812
Fn 0.000179
Gn 22573.493061
Hn 2279.947815