Sellmeier coefficients

Formula (wl is wavelength in micrometers):
n^2 = 1 + K1 wl^2 / (wl^2 - L1) + K2 wl^2 / (wl^2 - L2) + K3 wl^2 / (wl^2 - L3)

K1 = 7.523413655E-01
L1 = 2.504320861E-03
K2 = 4.166397751E-01
L2 = 1.814024222E-02
K3 = 1.010000000E+01
L3 = 1.000000000E+03