## Optical constants of KI (Potassium iodide)

Li 1976: n 0.25–50 µm

Wavelength:
µm

(0.25–50)

### Complex refractive index (*n+ik)*

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=0.47285+\frac{0.16512λ^2}{λ^2-0.129^2}+\frac{0.41222λ^2}{λ^2-0.175^2}+\frac{0.44163λ^2}{λ^2-0.187^2}+\frac{0.16076λ^2}{λ^2-0.219^2}+\frac{0.33571λ^2}{λ^2-69.44^2}+\frac{1.92474λ^2}{λ^2-98.04^2}$$### Comments

297 K (24 °C).

### References

H. H. Li. Refractive index of alkali halides and its wavelength and temperature derivatives. *J. Phys. Chem. Ref. Data* **5**, 329-528 (1976) and references therein.

^{*} Sellmeier formula is derived by critical analysis of experimental data from several sources.