LASFN14 by Sumita

Obsolete Very Rare Environmentally Dangerous

LASFN14 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.834 and a Vd of 37.2. It has good chemical resistance and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.27–2.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.27–2.0 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) 37.2
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{3.25924 - 0.0132339\,\lambda^2 + 0.0345032\,\lambda^{-2} + 0.00106401\,\lambda^{-4} - 1.4213 \times 10^{-5}\,\lambda^{-6} + 5.37357 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.2
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) 4.38
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
S-LAH60V Ohara 1.833999 37.206855
H-ZLAF53B CDGM 1.834 37.210555
H-ZLAF53BGT CDGM 1.834 37.210555
S-LAH60MQ Ohara 1.833999 37.172099
LAH60 Ohara 1.834 37.166863
S-LAH60 Ohara 1.834 37.160487
N-LASF40 Schott 1.83404 37.3
M-NBFD10 Hoya 1.83441 37.29
MP-NBFD10-20 Hoya 1.83461 37.29
NBFD10 Hoya 1.834 37.34
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaSFn14 Sumita 1.834 37.3
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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