LAKN12 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAKN12 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.30 to 2.00 µm with an nd of 1.7335 and a Vd of 51.2. 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: 0.300–2.000 µm
Optical Properties
Refractive Index (nd) 1.7335
Abbe Number (Vd) 51.2
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.94109 - 0.0117917\,\lambda^2 + 0.0224661\,\lambda^{-2} + 0.00034762\,\lambda^{-4} - 1.76395 \times 10^{-6}\,\lambda^{-6} + 1.03044 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.7
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) 3.92
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
TAC4 Hoya 1.734 51.05
D34-51 Corning 1.733513 51.387663
S-LAL59 Ohara 1.733997 51.47057
H-LAK54 CDGM 1.734 51.485829
LAL59 Ohara 1.733997 51.488026
LAK16A Schott 1.733501 51.779678
NBF3 Hoya 1.735001 49.792211
LAK28 Schott 1.744287 50.770906
N-LAK28 Schott 1.74429 50.77
S-LAL61Q Ohara 1.740999 52.60195
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LAFN7 Sumita 1.735 49.5
K-LaKn14 Sumita 1.741 52.7
LAKN14 Sumita 1.741 52.7
K-LaK10 Sumita 1.72 50.3
LAK10 Sumita 1.72 50.3
LAFN5 Sumita 1.743 49.2
K-LaFn5 Sumita 1.743 49.2
K-LaSKn1 Sumita 1.755 52.4
LASKN1 Sumita 1.755 52.4
K-LaK18 Sumita 1.72916 54.7
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