K-BaFn3 by Sumita

Standard Rare Environmentally Friendly

K-BaFn3 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.66422 and a Vd of 49.2. It has medium thermal expansion (CTE of 7.0×10⁻⁶/K) and average chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.340–2.000 µm
Optical Properties
Refractive Index (nd) 1.66422
Abbe Number (Vd) 49.2
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.71289 - 0.0106199\,\lambda^2 + 0.0196536\,\lambda^{-2} + 0.000400512\,\lambda^{-4} + 1.16265 \times 10^{-6}\,\lambda^{-6} + 1.15796 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.0
TCE 100/300°C (10-6/K) 8.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[7.44 \times 10^{-8} + 2(1.27 \times 10^{-8})\,\Delta T + 3(-3.11 \times 10^{-10})\,\Delta T^2 + \frac{5.72 \times 10^{-7} + 2(5.44 \times 10^{-10})\,\Delta T}{\lambda - 0.214}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.62
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BAF21 Hoya 1.66422 48.941939
C67-48 Corning 1.666698 48.434395
H-ZBAF16 CDGM 1.66672 48.421731
BAFN11 Schott 1.666721 48.421391
S-BAH11 Ohara 1.666718 48.325247
BAH11 Ohara 1.666718 48.317266
BAF11 Hoya 1.66672 48.3
CALCITE Generic Birefringent 1.658643 48.541403
CALCITE Generic IR 1.658643 48.541403
H-ZBAF50 CDGM 1.65844 50.852265
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
BAFN3 Sumita 1.66422 49.2
BAF11 Sumita 1.66672 48.4
SSK5 Sumita 1.65844 50.8
K-LCV93 Sumita 1.6652 47.3
K-LCV93(M) Sumita 1.66355 47.2
BAF10 Sumita 1.67003 47.2
LAKN8 Sumita 1.678 50.7
K-LaKn7 Sumita 1.67 51.7
LAKN7 Sumita 1.67 51.7
LAFN1 Sumita 1.685 49.2
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