LAFN3 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAFN3 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 1.7 and a Vd of 48.0. It has average 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) 1.7
Abbe Number (Vd) 48.0
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.82767 - 0.0105135\,\lambda^2 + 0.0208134\,\lambda^{-2} + 0.000790584\,\lambda^{-4} - 5.04247 \times 10^{-5}\,\lambda^{-6} + 4.01932 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.6
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) 4.02
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
LAM51 Ohara 1.699998 48.078869
H-LAF51 CDGM 1.7 48.079839
S-LAM51 Ohara 1.699998 48.080479
LAFL3 Hoya 1.700301 47.836538
LAFL2 Hoya 1.697 48.514006
S-LAM59 Ohara 1.697002 48.516066
LAM59 Ohara 1.697002 48.535864
H-LAF1 CDGM 1.69362 49.193837
LAFL23 Hoya 1.689 49.475821
C90-50 Corning 1.689009 49.625392
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaFn3 Sumita 1.7 48.0
LAFN2 Sumita 1.697 48.5
LAF3 Sumita 1.717 47.9
LAFN1 Sumita 1.685 49.2
LAKN10 Sumita 1.692 50.6
LAFN11 Sumita 1.72013 46.0
K-LaFn11 Sumita 1.72013 46.0
K-LaK10 Sumita 1.72 50.3
LAK10 Sumita 1.72 50.3
LAKN8 Sumita 1.678 50.7
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