GE_OLD by Generic IR

Standard Unknown Environmentally Friendly

GE_OLD by Generic IR is a standard optical glass. It transmits from 2.00 to 12.00 µm. It has low thermal expansion (CTE of 5.7×10⁻⁶/K).

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 2.0–12.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 2.0–12.0 µm
Abbe Number Calculator
Transmission vs Wavelength

No transmission data available.

Transmission Calculator
Valid wavelength range: 2.000–12.000 µm
Optical Properties
Refractive Index (nd) —
Abbe Number (Vd) —
Dispersion Formula Herzberger
Wavelength Range 2.0 — 12.0 µm
$$L = \frac{1}{\lambda^2 - 0.028} n(\lambda) = 4.00227 + 0.357829\,L + 0.261273\,L^2 - 7.43657 \times 10^{-5}\,\lambda^2 + 6.25411 \times 10^{-7}\,\lambda^4 - 1.57101 \times 10^{-9}\,\lambda^6$$
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) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0.00022 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
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: JOSA, 47, 244 (57): 48, 579 (58)

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