K-LaKn11 by Sumita

Obsolete Very Rare Environmentally Friendly

K-LaKn11 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.33 to 2.00 µm with an nd of 1.6583 and a Vd of 53.4. It has excellent 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: 0.330–2.000 µm
Optical Properties
Refractive Index (nd) 1.6583
Abbe Number (Vd) 53.4
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.69946 - 0.0114412\,\lambda^2 + 0.0176729\,\lambda^{-2} + 0.000396046\,\lambda^{-4} - 3.57392 \times 10^{-6}\,\lambda^{-6} + 7.08616 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.99 \times 10^{-7} + 2(1.21 \times 10^{-8})\,\Delta T + 3(-1.58 \times 10^{-10})\,\Delta T^2 + \frac{5.15 \times 10^{-7} + 2(8.57 \times 10^{-10})\,\Delta T}{\lambda - 0.196}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.75
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LACL3 Hoya 1.664798 53.401295
BSM71 Ohara 1.648497 53.035185
BACED20 Hoya 1.648498 53.03151
E-BACED20 Hoya 1.6485 53.03
S-BSM71 Ohara 1.648498 53.023881
H-LAK11 CDGM 1.66461 54.612239
BBO Generic Birefringent 1.670737 52.593907
H-ZBAF3 CDGM 1.65691 51.12138
H-LAK67 CDGM 1.67 51.738482
D-LAK70-25 CDGM 1.668 55.295752
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LAKN11 Sumita 1.6583 53.4
SSKN1 Sumita 1.6485 53.0
K-VC78(M) Sumita 1.66624 55.1
K-LaKn7 Sumita 1.67 51.7
LAKN7 Sumita 1.67 51.7
VC78 Sumita 1.6691 55.4
K-VC78 Sumita 1.66955 55.4
SSK5 Sumita 1.65844 50.8
K-LaKn5 Sumita 1.65 55.8
LAKN5 Sumita 1.65 55.8
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