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.