SAPPHIRE by Generic IR

Standard Unknown Environmentally Friendly

SAPPHIRE by Generic IR is a standard optical glass. It transmits from 0.20 to 5.50 µm with an nd of 1.768234 and a Vd of 72.237215. It has medium thermal expansion (CTE of 6.65×10⁻⁶/K).

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.2–5.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.2–5.5 µm
Abbe Number Calculator
Transmission vs Wavelength

No transmission data available.

Transmission Calculator
Valid wavelength range: 0.200–5.500 µm
Optical Properties
Refractive Index (nd) 1.768234
Abbe Number (Vd) 72.237215
Dispersion Formula Sellmeier
Wavelength Range 0.2 — 5.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.0238\,\lambda^2}{\lambda^2 - 0.00377588} + \frac{1.05826\,\lambda^2}{\lambda^2 - 0.0122544} + \frac{5.28079\,\lambda^2}{\lambda^2 - 321.362}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.65
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.8 \times 10^{-5} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.987
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: The Infrared & Electro-Optical Systems Handbook V. III

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
AL2O3 Generic Birefringent 1.768172 72.308589
AL2O3-E Generic Birefringent 1.760096 72.988091
BEO-E Generic Birefringent 1.734106 79.335058
K-LaK18 Sumita 1.72916 54.7
LAK18 Sumita 1.72916 54.7
H-LAK52 CDGM 1.72916 54.684737
LAL18 Ohara 1.729157 54.683134
S-LAL18 Ohara 1.729157 54.680013
TAC8 Hoya 1.72916 54.67
TAC8P Hoya 1.72916 54.54
Similar Glasses (Generic IR)
Glass Manufacturer nd Vd Compare
SPINEL Generic IR 1.716226 60.607355
ALON Generic IR 1.788917 58.204971
MGO Generic IR 1.737505 53.505455
BEO Generic IR 1.718619 93.251706
CALCITE Generic IR 1.658643 48.541403
IRGN6 Generic IR 1.589096 56.33564
IRG11 Generic IR 1.680932 44.434326
IRG15 Generic IR 1.534275 55.700357
GEO2 Generic IR 1.608459 41.728763
CSBR Generic IR 1.69706 34.108015
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