K-LaSFn14 by Sumita

Standard Rare Environmentally Friendly

K-LaSFn14 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 1.834 and a Vd of 37.3. It has low thermal expansion (CTE of 5.8×10⁻⁶/K) and good chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.4–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.4–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.340–2.000 µm
Optical Properties
Refractive Index (nd) 1.834
Abbe Number (Vd) 37.3
Dispersion Formula Schott
Wavelength Range 0.4 — 1.55 µm
$$n(\lambda) = \sqrt{3.26432 - 0.0162651\,\lambda^2 + 0.0320284\,\lambda^{-2} + 0.00152719\,\lambda^{-4} - 4.77755 \times 10^{-5}\,\lambda^{-6} + 5.73459 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.8
TCE 100/300°C (10-6/K) 7.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.04 \times 10^{-6} + 2(1.48 \times 10^{-8})\,\Delta T + 3(-2.22 \times 10^{-10})\,\Delta T^2 + \frac{7.19 \times 10^{-7} + 2(7.99 \times 10^{-10})\,\Delta T}{\lambda - 0.248}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.18
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
N-LASF40 Schott 1.83404 37.3
NBFD10 Hoya 1.834 37.34
M-NBFD10 Hoya 1.83441 37.29
MP-NBFD10-20 Hoya 1.83461 37.29
H-ZLAF53B CDGM 1.834 37.210555
H-ZLAF53BGT CDGM 1.834 37.210555
S-LAH60V Ohara 1.833999 37.206855
S-LAH60MQ Ohara 1.833999 37.172099
LAH60 Ohara 1.834 37.166863
S-LAH60 Ohara 1.834 37.160487
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LASFN14 Sumita 1.834 37.2
K-VC90(M) Sumita 1.84859 38.9
K-VC90 Sumita 1.8528 39.0
K-VC185(M) Sumita 1.84909 40.5
K-VC185 Sumita 1.85375 40.6
K-VC99(M) Sumita 1.84604 41.5
K-LaSFn2 Sumita 1.805 39.6
LASFN2 Sumita 1.805 39.6
K-VC99 Sumita 1.8506 41.6
K-VC89 Sumita 1.81 41.0
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