LAF3 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAF3 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 1.717 and a Vd of 47.9. 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) 1.717
Abbe Number (Vd) 47.9
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.88494 - 0.0126683\,\lambda^2 + 0.0211705\,\lambda^{-2} + 0.000851178\,\lambda^{-4} - 4.90248 \times 10^{-5}\,\lambda^{-6} + 3.73617 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.7
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) 4.05
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
H-LAF2 CDGM 1.717 47.888609
S-LAM3 Ohara 1.717004 47.927969
LAM3 Ohara 1.717004 47.942632
N-LAF3 Schott 1.717 47.96
LAF3 Schott 1.716998 47.961124
LAF30 Hoya 1.717 47.97772
LAF3 Hoya 1.717 47.98
D17-48 Corning 1.717011 47.998493
LAM61 Ohara 1.720002 46.035166
S-LAM61 Ohara 1.720002 46.024571
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaFn11 Sumita 1.72013 46.0
LAFN11 Sumita 1.72013 46.0
LAFN3 Sumita 1.7 48.0
K-LaFn3 Sumita 1.7 48.0
LAK10 Sumita 1.72 50.3
K-LaK10 Sumita 1.72 50.3
LAFN2 Sumita 1.697 48.5
LAFN7 Sumita 1.735 49.5
LAFN5 Sumita 1.743 49.2
K-LaFn5 Sumita 1.743 49.2
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