N-LAK22 by Schott

Preferred Unknown Environmentally Friendly

N-LAK22 by Schott is a preferred optical glass. It transmits from 0.28 to 2.50 µm with an nd of 1.65113 and a Vd of 55.89. It has medium thermal expansion (CTE of 6.6×10⁻⁶/K), below average chemical resistance, and low relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.28–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.28–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.280–2.500 µm
Optical Properties
Refractive Index (nd) 1.65113
Abbe Number (Vd) 55.89
Dispersion Formula Sellmeier
Wavelength Range 0.28 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.1423\,\lambda^2}{\lambda^2 - 0.00585779} + \frac{0.535138\,\lambda^2}{\lambda^2 - 0.0198546} + \frac{1.04088\,\lambda^2}{\lambda^2 - 100.834}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.6
TCE 100/300°C (10-6/K) 7.4
Thermal Conductivity (W/mK) 0.75
Heat Capacity (J/gK) 0.54
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.36 \times 10^{-6} + 2(1.49 \times 10^{-8})\,\Delta T + 3(-1.29 \times 10^{-11})\,\Delta T^2 + \frac{3.41 \times 10^{-7} + 2(2.09 \times 10^{-10})\,\Delta T}{\lambda - 0.262}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.768
Relative Cost 1.4
Mechanical Properties
Young's Modulus (GPa) 90.0
Poisson's Ratio 0.27
Knoop Hardness (kgf/mm²) 600.0
Chemical Resistance
Climatic Resistance 2
Stain Resistance 2
Acid Resistance 51
Alkali Resistance 1
Phosphate Resistance 2
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-LAK10 CDGM 1.65113 55.890872
C51-56 Corning 1.651124 55.895803
LAKN5 Sumita 1.65 55.8
K-LaKn5 Sumita 1.65 55.8
LACL2 Hoya 1.650201 55.737216
LAL54 Ohara 1.650996 56.154774
S-LAL54 Ohara 1.650996 56.163717
S-LAL54Q Ohara 1.651 56.238379
C57-57 Corning 1.657503 57.198059
LAKN13 Sumita 1.641 56.8
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
LAKN22 Schott 1.65113 55.891754
LAK11 Schott 1.658302 57.261599
N-SK18 Schott 1.63854 55.423596
SK18A Schott 1.63854 55.423596
LAKN6 Schott 1.642499 57.962061
LAKN7 Schott 1.6516 58.517773
N-LAK7 Schott 1.6516 58.52
LAK23 Schott 1.668816 57.38444
N-LAK12 Schott 1.6779 55.2
LAKN12 Schott 1.6779 55.199566
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