LAF2 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAF2 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 1.744 and a Vd of 44.9. 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) 1.744
Abbe Number (Vd) 44.9
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.96878 - 0.0121176\,\lambda^2 + 0.0244624\,\lambda^{-2} + 0.000791121\,\lambda^{-4} - 3.39789 \times 10^{-5}\,\lambda^{-6} + 3.98623 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.6
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) 4.03
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
LAF2 Hoya 1.744 44.9
H-LAF3B CDGM 1.744 44.900027
LAF20 Hoya 1.744 44.872914
N-LAF2 Schott 1.74397 44.85
D44-45 Corning 1.744001 44.818533
LAM2 Ohara 1.743997 44.787528
S-LAM2 Ohara 1.743997 44.786431
LAF2 Schott 1.744002 44.719972
P-LAF37 Schott 1.7555 45.66
H-LAF6LA CDGM 1.757 47.711817
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaF2 Sumita 1.744 44.9
K-VC174(M) Sumita 1.74578 45.1
K-VC174 Sumita 1.7485 45.3
K-VC82(M) Sumita 1.75028 45.4
VC81 Sumita 1.75512 45.6
K-VC82 Sumita 1.7555 45.6
K-GIR140 Sumita 1.75106 43.1
LAFN8 Sumita 1.756 47.6
LAFN11 Sumita 1.72013 46.0
K-LaFn11 Sumita 1.72013 46.0
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