K-LaKn5 by Sumita

Obsolete Very Rare Environmentally Friendly

K-LaKn5 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 1.65 and a Vd of 55.8. It has 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: 0.330–2.000 µm
Optical Properties
Refractive Index (nd) 1.65
Abbe Number (Vd) 55.8
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.67612 - 0.0121088\,\lambda^2 + 0.0161435\,\lambda^{-2} + 0.000519209\,\lambda^{-4} - 2.83953 \times 10^{-5}\,\lambda^{-6} + 1.8555 \times 10^{-6}\,\lambda^{-8}}$$
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) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-8.68 \times 10^{-7} + 2(1.28 \times 10^{-8})\,\Delta T + 3(-1.92 \times 10^{-10})\,\Delta T^2 + \frac{5.01 \times 10^{-7} + 2(9.91 \times 10^{-10})\,\Delta T}{\lambda - 0.169}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.71
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
LACL2 Hoya 1.650201 55.737216
N-LAK22 Schott 1.65113 55.89
H-LAK10 CDGM 1.65113 55.890872
LAKN22 Schott 1.65113 55.891754
C51-56 Corning 1.651124 55.895803
LAL54 Ohara 1.650996 56.154774
S-LAL54 Ohara 1.650996 56.163717
S-LAL54Q Ohara 1.651 56.238379
C39-56 Corning 1.638505 55.504447
BACD18 Hoya 1.63854 55.45
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LAKN5 Sumita 1.65 55.8
LAKN13 Sumita 1.641 56.8
K-SK18RH Sumita 1.63854 55.5
K-SK18 Sumita 1.63854 55.5
SK18RH Sumita 1.63854 55.5
SK18 Sumita 1.63854 55.5
K-LaK11 Sumita 1.6583 57.3
LAK11 Sumita 1.6583 57.3
K-VC78(M) Sumita 1.66624 55.1
LAK7 Sumita 1.6516 58.3
Compare Glasses
    Compare Selected