H-ZK10 by CDGM

$$n(\lambda) = \sqrt{1 + \frac{1.48008\,\lambda^2}{\lambda^2 - 0.00852142} + \frac{0.87419\,\lambda^2}{\lambda^2 - 93.1901} + \frac{0.10584\,\lambda^2}{\lambda^2 - 0.0327273}}$$

$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-3.18 \times 10^{-9} + 2(2.08 \times 10^{-8})\,\Delta T + 3(-7.24 \times 10^{-11})\,\Delta T^2 + \frac{5 \times 10^{-7} + 2(-1.17 \times 10^{-10})\,\Delta T}{\lambda - 0.212}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$