GERMANIUM by Generic IR

Standard Unknown Environmentally Friendly

GERMANIUM by Generic IR is a standard optical glass. It transmits from 1.65 to 15.00 µm. It has low thermal expansion (CTE of 5.7×10⁻⁶/K).

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 2.0–15.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 2.0–15.0 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 1.653–15.000 µm
Optical Properties
Refractive Index (nd) —
Abbe Number (Vd) —
Dispersion Formula Sellmeier 4
Wavelength Range 2.0 — 15.0 µm
$$n(\lambda) = \sqrt{9.28065 + \frac{6.73019\,\lambda^2}{\lambda^2 - 0.441837} + \frac{0.213137\,\lambda^2}{\lambda^2 - 3870.35}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.7
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0.00022 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20.15\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.327
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Notes

source: Handbook of Optical Constants of Solids

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