E78-38 by Corning

Standard Unknown Environmentally Friendly

E78-38 by Corning is a standard optical glass. It transmits from 0.35 to 1.80 µm with an nd of 1.878005 and a Vd of 38.494794. It has low thermal expansion (CTE of 6.2×10⁻⁶/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: 0.350–1.800 µm
Optical Properties
Refractive Index (nd) 1.878005
Abbe Number (Vd) 38.494794
Dispersion Formula Schott
Wavelength Range 0.35 — 1.8 µm
$$n(\lambda) = \sqrt{3.41767 - 0.0153208\,\lambda^2 + 0.0370062\,\lambda^{-2} + 0.000752898\,\lambda^{-4} + 3.72463 \times 10^{-5}\,\lambda^{-6} + 1.56734 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.2
TCE 100/300°C (10-6/K) 7.0
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) 5.04
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
TAFD17 Hoya 1.877999 38.197051
LASFN15 Schott 1.878001 38.072485
H-ZLAF68N CDGM 1.883 39.2182
H-ZLAF68NB CDGM 1.883 39.235474
M-TAFD307 Hoya 1.88202 37.22
MC-TAFD307 Hoya 1.88202 37.22
MP-TAFD307 Hoya 1.88202 37.22
MC-TAFD317 Hoya 1.8812 37.17
D-ZLAF67-25 CDGM 1.88259 37.185491
D-ZLAF67 CDGM 1.88385 37.198899
Similar Glasses (Corning)
Glass Manufacturer nd Vd Compare
E65-40 Corning 1.865 40.112393
E37-30 Corning 1.836406 30.205692
D96-43 Corning 1.796195 43.217783
E00-46 Corning 1.800001 45.608618
E03-47 Corning 1.803002 46.408629
D88-47 Corning 1.788001 47.412327
E05-25 Corning 1.805093 25.506125
D85-26 Corning 1.784994 25.902085
D85-25 Corning 1.784752 25.799504
D44-45 Corning 1.744001 44.818533
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