LASFN2 by Sumita

Obsolete Very Rare Environmentally Dangerous

LASFN2 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 1.805 and a Vd of 39.6. 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) 1.805
Abbe Number (Vd) 39.6
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{3.16412 - 0.0124816\,\lambda^2 + 0.0315782\,\lambda^{-2} + 0.00075767\,\lambda^{-4} + 9.33755 \times 10^{-6}\,\lambda^{-6} + 2.77907 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.3
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) 4.23
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
H-ZLAF51 CDGM 1.8045 39.635248
NBFD3 Hoya 1.8045 39.64
S-LAH63 Ohara 1.804398 39.58615
S-LAH63Q Ohara 1.8044 39.580489
LAH63 Ohara 1.804398 39.581254
L-LAH81 Ohara 1.8061 40.400738
P-LASF50 Schott 1.8086 40.46
N-LASF43 Schott 1.8061 40.61
L-LAH84 Ohara 1.80835 40.548503
LASF3 Schott 1.808009 40.610164
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaSFn2 Sumita 1.805 39.6
LASFN1 Sumita 1.806 40.7
K-LaSFn1 Sumita 1.8061 40.7
K-VC89(M) Sumita 1.8059 40.9
K-VC181(M) Sumita 1.80614 41.1
K-VC89 Sumita 1.81 41.0
K-VC181 Sumita 1.81055 41.1
K-VC179 Sumita 1.7989 41.8
K-VC179(M) Sumita 1.79441 41.9
K-LaSFn3 Sumita 1.7995 42.3
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