D20-50 by Corning

Standard Unknown Environmentally Friendly

D20-50 by Corning is a standard optical glass. It transmits from 0.28 to 1.80 µm with an nd of 1.720003 and a Vd of 50.312121. It has low thermal expansion (CTE of 6.0×10⁻⁶/K).

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.28–1.8 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.28–1.8 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.280–1.800 µm
Optical Properties
Refractive Index (nd) 1.720003
Abbe Number (Vd) 50.312121
Dispersion Formula Schott
Wavelength Range 0.28 — 1.8 µm
$$n(\lambda) = \sqrt{2.8956 - 0.0125463\,\lambda^2 + 0.0223846\,\lambda^{-2} + 0.000188626\,\lambda^{-4} + 3.29758 \times 10^{-5}\,\lambda^{-6} - 1.10085 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.0
TCE 100/300°C (10-6/K) 7.2
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) 3.94
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
K-LaK10 Sumita 1.72 50.3
LAK10 Sumita 1.72 50.3
H-LAK8B CDGM 1.72 50.280736
H-LAK8A CDGM 1.72 50.343857
LAC10 Hoya 1.72 50.35
LAL10 Ohara 1.719995 50.254429
S-LAL10 Ohara 1.719995 50.230564
LAK10 Schott 1.72 50.41004
N-LAK10 Schott 1.72003 50.62
H-LAK72 CDGM 1.713 51.80665
Similar Glasses (Corning)
Glass Manufacturer nd Vd Compare
D34-51 Corning 1.733513 51.387663
D17-48 Corning 1.717011 47.998493
D13-54 Corning 1.713 53.843096
C90-50 Corning 1.689009 49.625392
C90-55 Corning 1.691008 54.793839
C97-55 Corning 1.697005 55.409848
D44-45 Corning 1.744001 44.818533
C97-56 Corning 1.697 56.222926
C67-48 Corning 1.666698 48.434395
C70-47 Corning 1.670005 47.112037
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