LAKN9 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAKN9 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.31 to 2.00 µm with an nd of 1.678 and a Vd of 53.3. 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: 0.310–2.000 µm
Optical Properties
Refractive Index (nd) 1.678
Abbe Number (Vd) 53.3
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.76116 - 0.0100398\,\lambda^2 + 0.0188262\,\lambda^{-2} + 0.000460126\,\lambda^{-4} - 2.1154 \times 10^{-5}\,\lambda^{-6} + 1.60134 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.8
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) 3.99
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
LACL8 Hoya 1.677896 53.419218
BBO Generic Birefringent 1.670737 52.593907
D-LAK5-25 CDGM 1.67686 54.805426
L-LAL12 Ohara 1.6779 54.88744
D-LAK5 CDGM 1.6779 54.889665
LAKL12 Schott 1.6779 54.92
LACL3 Hoya 1.664798 53.401295
LAKN12 Schott 1.6779 55.199566
N-LAK12 Schott 1.6779 55.2
H-LAK67 CDGM 1.67 51.738482
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-VC80(M) Sumita 1.68983 52.9
LAKN7 Sumita 1.67 51.7
K-LaKn7 Sumita 1.67 51.7
LAK13 Sumita 1.6935 53.4
K-VC80 Sumita 1.69384 53.1
LAK12 Sumita 1.6779 55.5
K-LaK12 Sumita 1.6779 55.5
LAK9 Sumita 1.691 54.8
K-LaK9 Sumita 1.691 54.8
K-VC78 Sumita 1.66955 55.4
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