## Optical constants of KBr (Potassium bromide)

Li 1976: n 0.20–42 µm

Wavelength:
µm

(0.2–42)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=0.39408+\frac{0.79221λ^2}{λ^2-0.146^2}+\frac{0.01981λ^2}{λ^2-0.173^2}+\frac{0.15587λ^2}{λ^2-0.187^2}+\frac{0.17673λ^2}{λ^2-60.61^2}+\frac{2.06217λ^2}{λ^2-87.72^2}$$### 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.