LAKN8 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAKN8 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 1.678 and a Vd of 50.7. 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) 1.678
Abbe Number (Vd) 50.7
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.75352 - 0.00810902\,\lambda^2 + 0.023318\,\lambda^{-2} - 0.000656777\,\lambda^{-4} + 0.000137244\,\lambda^{-6} - 5.63523 \times 10^{-6}\,\lambda^{-8}}$$
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) 3.8
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
S-LAL56 Ohara 1.677898 50.722184
LAL56 Ohara 1.677898 50.723364
LACL9 Hoya 1.6779 50.551353
LACL4 Hoya 1.669603 51.65903
H-LAK67 CDGM 1.67 51.738482
LAFL1 Hoya 1.686004 49.347081
LAFN23 Schott 1.689004 49.711581
C90-50 Corning 1.689009 49.625392
LAFL23 Hoya 1.689 49.475821
LAL58 Ohara 1.693495 50.807634
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LAKN7 Sumita 1.67 51.7
K-LaKn7 Sumita 1.67 51.7
LAFN1 Sumita 1.685 49.2
LAKN10 Sumita 1.692 50.6
K-BaFn3 Sumita 1.66422 49.2
BAFN3 Sumita 1.66422 49.2
LAKN9 Sumita 1.678 53.3
SSK5 Sumita 1.65844 50.8
K-VC80(M) Sumita 1.68983 52.9
BAF11 Sumita 1.66672 48.4
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