S-LAL13 by Ohara

$$n(\lambda) = \sqrt{1 + \frac{0.980071\,\lambda^2}{\lambda^2 - 0.00389124} + \frac{0.832905\,\lambda^2}{\lambda^2 - 0.0189165} + \frac{1.28112\,\lambda^2}{\lambda^2 - 98.9053}}$$

$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.88 \times 10^{-6} + 2(1.5 \times 10^{-8})\,\Delta T + 3(-4 \times 10^{-11})\,\Delta T^2 + \frac{3.13 \times 10^{-7} + 2(5.37 \times 10^{-10})\,\Delta T}{\lambda - 0.292}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$