LAK11 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAK11 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.28 to 2.00 µm with an nd of 1.6583 and a Vd of 57.3. 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: 0.280–2.000 µm
Optical Properties
Refractive Index (nd) 1.6583
Abbe Number (Vd) 57.3
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.70187 - 0.0109134\,\lambda^2 + 0.017217\,\lambda^{-2} + 0.00021857\,\lambda^{-4} + 6.95613 \times 10^{-6}\,\lambda^{-6} - 3.15961 \times 10^{-8}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.5
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) 3.85
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
LAL11 Ohara 1.658296 57.332589
S-LAL11 Ohara 1.658296 57.332589
LAC11 Hoya 1.658296 57.262085
LAK11 Schott 1.658302 57.261599
C57-57 Corning 1.657503 57.198059
H-LAK1 CDGM 1.6595 57.34726
LAC7 Hoya 1.6516 58.4
H-LAK50A CDGM 1.6516 58.403057
LAK23 Schott 1.668816 57.38444
S-LAL54Q Ohara 1.651 56.238379
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaK11 Sumita 1.6583 57.3
LAK7 Sumita 1.6516 58.3
K-LaK7 Sumita 1.6516 58.3
LAKN4 Sumita 1.671 57.2
K-LaKn4 Sumita 1.671 57.2
K-LaKn5 Sumita 1.65 55.8
LAKN5 Sumita 1.65 55.8
K-LaK6 Sumita 1.6425 58.1
LAK6 Sumita 1.6425 58.1
VC78 Sumita 1.6691 55.4
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