E65-40 by Corning

Standard Unknown Environmentally Friendly

E65-40 by Corning is a standard optical glass. It transmits from 0.34 to 1.80 µm with an nd of 1.865 and a Vd of 40.112393. It has medium thermal expansion (CTE of 7.0×10⁻⁶/K).

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.35–1.8 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.35–1.8 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.340–1.800 µm
Optical Properties
Refractive Index (nd) 1.865
Abbe Number (Vd) 40.112393
Dispersion Formula Schott
Wavelength Range 0.35 — 1.8 µm
$$n(\lambda) = \sqrt{3.37327 - 0.012035\,\lambda^2 + 0.0355784\,\lambda^{-2} + 0.000582926\,\lambda^{-4} + 4.72135 \times 10^{-5}\,\lambda^{-6} + 2.15711 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.0
TCE 100/300°C (10-6/K) 7.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.25
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 —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
L-LAH83 Ohara 1.864 40.577742
TAFD32 Hoya 1.8707 40.73
D-ZLAF85LS CDGM 1.8545 40.593546
LASFN13 Sumita 1.863 41.6
L-LAH85V Ohara 1.854 40.378368
L-LAH85 Ohara 1.854 40.393284
K-VC185 Sumita 1.85375 40.6
D-ZLAF85L CDGM 1.8537 40.579411
D-ZLAF85LS-25 CDGM 1.85344 40.557917
D-ZLAF85A CDGM 1.85222 40.10819
Similar Glasses (Corning)
Glass Manufacturer nd Vd Compare
E78-38 Corning 1.878005 38.494794
D96-43 Corning 1.796195 43.217783
E00-46 Corning 1.800001 45.608618
E03-47 Corning 1.803002 46.408629
E37-30 Corning 1.836406 30.205692
D88-47 Corning 1.788001 47.412327
E05-25 Corning 1.805093 25.506125
D44-45 Corning 1.744001 44.818533
D85-26 Corning 1.784994 25.902085
D85-25 Corning 1.784752 25.799504
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