LAKN2 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAKN2 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.29 to 2.00 µm with an nd of 1.6405 and a Vd of 60.1. It has below 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: 0.290–2.000 µm
Optical Properties
Refractive Index (nd) 1.6405
Abbe Number (Vd) 60.1
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.64991 - 0.0130571\,\lambda^2 + 0.0147856\,\lambda^{-2} + 0.000406884\,\lambda^{-4} - 1.90338 \times 10^{-5}\,\lambda^{-6} + 1.0428 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.0
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) 3.66
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 5
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
N-LAK21 Schott 1.64049 60.1
LAK21 Schott 1.640495 60.101885
C41-60 Corning 1.640495 60.130957
BSM81 Ohara 1.639999 60.091709
S-BSM81 Ohara 1.639999 60.078127
LACL6 Hoya 1.640003 60.153568
LACL60 Hoya 1.64 60.2
H-LAK4L CDGM 1.64 60.202769
LAKL21 Schott 1.64048 59.749915
S-BSM36 Ohara 1.642495 58.369399
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaKn2 Sumita 1.6405 60.1
K-LaK6 Sumita 1.6425 58.1
LAK6 Sumita 1.6425 58.1
K-LaK7 Sumita 1.6516 58.3
LAK7 Sumita 1.6516 58.3
K-LaFK65(M) Sumita 1.65224 62.2
SK16RH Sumita 1.62041 60.3
SK16 Sumita 1.62041 60.3
K-SK16RH Sumita 1.62041 60.3
K-LaFK63(M) Sumita 1.63463 63.0
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