RefractiveIndex.INFO

Refractive index database


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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)[ i ]


n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]

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

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.

Data

[Expressions for n]   [CSV - comma separated]   [TXT - tab separated]   [Full database record]

INFO

Germanium, Ge

Germanium is a popular optical material for infrared wavelengths. Ge optical components (lenses, filters, beamsplitters etc.) are used in thermal imaging, CO2 lasers, night vision systems and other applications in mid-wave infrared (MWIR) and long-wave infrared (LWIR).

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