LAFN7 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAFN7 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.32 to 2.00 µm with an nd of 1.735 and a Vd of 49.5. 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: 0.320–2.000 µm
Optical Properties
Refractive Index (nd) 1.735
Abbe Number (Vd) 49.5
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.94561 - 0.0137154\,\lambda^2 + 0.0227467\,\lambda^{-2} + 0.000381749\,\lambda^{-4} + 9.55552 \times 10^{-6}\,\lambda^{-6} + 4.37262 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 7.7
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) 3.9
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
NBF3 Hoya 1.735001 49.792211
L-LAM72 Ohara 1.733099 48.896607
D-LAF53-25 CDGM 1.7421 49.246024
S-LAM60 Ohara 1.743198 49.339444
LAM60 Ohara 1.743198 49.309053
N-LAF35 Schott 1.7433 49.4
L-LAM60 Ohara 1.743198 49.295578
M-NBF1 Hoya 1.7433 49.33
MC-NBF1 Hoya 1.7433 49.33
MP-NBF1 Hoya 1.7433 49.33
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaFn5 Sumita 1.743 49.2
LAFN5 Sumita 1.743 49.2
LAKN12 Sumita 1.7335 51.2
K-LaK10 Sumita 1.72 50.3
LAK10 Sumita 1.72 50.3
LAF3 Sumita 1.717 47.9
K-LaKn14 Sumita 1.741 52.7
LAKN14 Sumita 1.741 52.7
LAFN8 Sumita 1.756 47.6
K-LaFK50T(M) Sumita 1.76209 49.6
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