N-LAK14 by Schott

Preferred Unknown Environmentally Friendly

N-LAK14 by Schott is a preferred optical glass. It transmits from 0.31 to 2.50 µm with an nd of 1.6968 and a Vd of 55.41. It has low thermal expansion (CTE of 5.5×10⁻⁶/K), below average chemical resistance, and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.31–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.31–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–2.500 µm
Optical Properties
Refractive Index (nd) 1.6968
Abbe Number (Vd) 55.41
Dispersion Formula Sellmeier
Wavelength Range 0.31 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.50781\,\lambda^2}{\lambda^2 - 0.00746099} + \frac{0.318867\,\lambda^2}{\lambda^2 - 0.0242025} + \frac{1.14287\,\lambda^2}{\lambda^2 - 80.9565}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.5
TCE 100/300°C (10-6/K) 6.9
Thermal Conductivity (W/mK) 0.89
Heat Capacity (J/gK) 0.63
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.68 \times 10^{-6} + 2(1.15 \times 10^{-8})\,\Delta T + 3(-1.44 \times 10^{-11})\,\Delta T^2 + \frac{3.72 \times 10^{-7} + 2(5.53 \times 10^{-10})\,\Delta T}{\lambda - 0.226}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.63
Relative Cost 4.1
Mechanical Properties
Young's Modulus (GPa) 111.0
Poisson's Ratio 0.28
Knoop Hardness (kgf/mm²) 730.0
Chemical Resistance
Climatic Resistance 3
Stain Resistance 2
Acid Resistance 52
Alkali Resistance 1
Phosphate Resistance 3
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
C97-55 Corning 1.697005 55.409848
M-LAC14 Hoya 1.6968 55.46
LAC14 Hoya 1.6968 55.46
H-LAK51A CDGM 1.6968 55.526357
LAL14 Ohara 1.696796 55.528037
S-LAL14 Ohara 1.696797 55.532241
MP-LAC14-80 Hoya 1.6976 55.51
LAK14 Sumita 1.6968 55.6
K-LaK14 Sumita 1.6968 55.6
LAC15 Hoya 1.6968 56.114704
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
LAKN14 Schott 1.6968 55.410215
LAK31 Schott 1.696732 56.420174
N-LAK9 Schott 1.691 54.71
LAK9 Schott 1.691002 54.708408
LAK9G15 Schott 1.69064 54.76
LAKN13 Schott 1.693501 53.330054
P-LAK35 Schott 1.6935 53.2
N-LAK12 Schott 1.6779 55.2
LAKN12 Schott 1.6779 55.199566
LAKL12 Schott 1.6779 54.92
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