Refractive index of Ge (Germanium)

Optical constants of Ge (Germanium)
Amotchkina et al, 2020: 0.42 µm film; n,k 0.4–15 µm

Wavelength: µm

(0.400–15.00)

Complex refractive index (n+ik)[ i ]

Derived optical constants

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
substrate: ZnSe
film_thickness: 0.42 µm

Comments

0.42 µm Ge₃ film deposited on 1 mm thick ZnSe substratee by e-beam evaporation at 120 ℃ substrate temperature.

References

T. Amotchkina, M. Trubetskov, D. Hahner, V. Pervak, Characterization of e-beam evaporated Ge, YbF₃, ZnS, and LaF₃ thin films for laser-oriented coatings, Appl. Opt. 59, A40-A47 (2020) (Data kindly provided by Tatiana Amotchkina [data] [description])

Data

[CSV - comma separated] [TXT - tab separated] [Full database record]

Optical transmission calculator

Wavelength: µm
Thickness:
Calculation method:

Transmittance[ i ]

T =

LogX LogY eV

Reflection calculator

Wavelength: µm
Angle of incidence (0~90°):
Direction: in out

Reflectance[ i ]

P-polarized

R_P =

S-polarized

R_S =

Non-polarized (Rp+Rs)/2

R =

R_P R_S R LogY

Reflection phase[ i ]

ɸ_P = °
ɸ_S = °

Brewster's angle[ i ]

θ_B = °

Critical angle[ i ] [ i ]

θ_C = °

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).

RefractiveIndex.INFO

Optical constants of Ge (Germanium)
Amotchkina et al, 2020: 0.42 µm film; n,k 0.4–15 µm

Complex refractive index (n+ik)[ i ]

Refractive index[ i ]

Extinction coefficient[ i ]

Derived optical constants

Relative permittivity (dielectric constants)[ i ] [ i ]

Absorption coefficient[ i ] [ i ]

Abbe number[ i ]

Chromatic dispersion[ i ]

Group index[ i ] [ i ]

Group velocity dispersion[ i ] [ i ] [ i ]

Conditions & Spec sheet

Comments

References

Data

Optical transmission calculator

Transmittance[ i ]

Reflection calculator

Reflectance[ i ]

P-polarized

S-polarized

Non-polarized (Rp+Rs)/2

Reflection phase[ i ]

Brewster's angle[ i ]

Critical angle[ i ] [ i ]

INFO

Germanium, Ge

External links

Optical constants of Ge (Germanium)Amotchkina et al, 2020: 0.42 µm film; n,k 0.4–15 µm

Complex refractive index (n+ik)[ i ]

Refractive index[ i ]

Extinction coefficient[ i ]

Derived optical constants

Relative permittivity (dielectric constants)[ i ] [ i ]

Absorption coefficient[ i ] [ i ]

Abbe number[ i ]

Chromatic dispersion[ i ]

Group index[ i ] [ i ]

Group velocity dispersion[ i ] [ i ] [ i ]

Conditions & Spec sheet

Comments

References

Data

Optical transmission calculator

Transmittance[ i ]

Reflection calculator

Reflectance[ i ]

P-polarized

S-polarized

Non-polarized (Rp+Rs)/2

Reflection phase[ i ]

Brewster's angle[ i ]

Critical angle[ i ] [ i ]

INFO

Germanium, Ge

External links

Optical constants of Ge (Germanium)
Amotchkina et al, 2020: 0.42 µm film; n,k 0.4–15 µm