K-LaKn14 by Sumita

Standard Rare Environmentally Friendly

K-LaKn14 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.28 to 2.00 µm with an nd of 1.741 and a Vd of 52.7. It has low thermal expansion (CTE of 5.8×10⁻⁶/K) and below average chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.280–2.000 µm
Optical Properties
Refractive Index (nd) 1.741
Abbe Number (Vd) 52.7
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.97135 - 0.0150471\,\lambda^2 + 0.0207484\,\lambda^{-2} + 0.000682393\,\lambda^{-4} - 4.58972 \times 10^{-5}\,\lambda^{-6} + 3.01515 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.8
TCE 100/300°C (10-6/K) 7.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.61 \times 10^{-6} + 2(1.71 \times 10^{-8})\,\Delta T + 3(-9.82 \times 10^{-11})\,\Delta T^2 + \frac{5.38 \times 10^{-7} + 2(2.35 \times 10^{-11})\,\Delta T}{\lambda - 0.138}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.31
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-LAK61 CDGM 1.740999 52.676196
LAL61 Ohara 1.740999 52.648747
S-LAL61 Ohara 1.740999 52.636502
TAC2 Hoya 1.741 52.61
S-LAL61Q Ohara 1.740999 52.60195
MGO Generic IR 1.737505 53.505455
LAK16A Schott 1.733501 51.779678
LAL59 Ohara 1.733997 51.488026
H-LAK54 CDGM 1.734 51.485829
S-LAL59 Ohara 1.733997 51.47057
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LAKN14 Sumita 1.741 52.7
LAKN12 Sumita 1.7335 51.2
K-LaSKn1 Sumita 1.755 52.4
LASKN1 Sumita 1.755 52.4
LAK18 Sumita 1.72916 54.7
K-LaK18 Sumita 1.72916 54.7
LAFN7 Sumita 1.735 49.5
K-LaFn5 Sumita 1.743 49.2
LAFN5 Sumita 1.743 49.2
LAK10 Sumita 1.72 50.3
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