## Optical constants of Ge (Germanium)

Icenogle et al. 1976: n 2.5–12 µm; 293 K

Wavelength:
µm

(2.5–12)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=8.28156+\frac{6.72880λ^2}{λ^2-0.44105}+\frac{0.21307λ^2}{λ^2-3870.1}$$### Comments

293 K (20 °C)

### References

1) Icenogle et al.. Refractive indexes and temperature coefficients of germanium and silicon *Appl. Opt.* **15** 2348-2351 (1976)

2) N. P. Barnes and M. S. Piltch. Temperature-dependent Sellmeier coefficients and nonlinear optics average power limit for germanium *J. Opt. Soc. Am.* **69** 178-180 (1979)

*Ref. 2 provides temperature-dependent Sellmeier equations based on data from Ref. 1.