RefractiveIndex.INFO

Refractive index database


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Optical constants of Ge (Germanium)
Burnett et al. 2016: n 2.00-14.0 µm

Wavelength: µm
 (2 – 14)  
 

Complex refractive index (n+ik)[ i ]


n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]

$$n^2-1=\frac{0.4886331λ^2}{λ^2-1.393959}+\frac{14.5142535λ^2}{λ^2-0.1626427}+\frac{0.0091224λ^2}{λ^2-752.190}$$

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
temperature: 22 °C

Comments

Standard uncertainties ranging from 2×10-5 near 2 µm to 8×10-5 near 14 µm

References

J. H. Burnett, S. G. Kaplan, E. Stover, A. Phenis. Refractive index measurements of Ge, Proc. SPIE 9974, 99740X (2016)

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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