N-LAK33B by Schott

Preferred Unknown Environmentally Friendly

N-LAK33B by Schott is a preferred optical glass. It transmits from 0.30 to 2.50 µm with an nd of 1.755 and a Vd of 52.3. It has low thermal expansion (CTE of 5.83×10⁻⁶/K), below average chemical resistance, and high relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–2.500 µm
Optical Properties
Refractive Index (nd) 1.755
Abbe Number (Vd) 52.3
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.42289\,\lambda^2}{\lambda^2 - 0.00670283} + \frac{0.593661\,\lambda^2}{\lambda^2 - 0.0219416} + \frac{1.16135\,\lambda^2}{\lambda^2 - 80.7408}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.83
TCE 100/300°C (10-6/K) 7.06
Thermal Conductivity (W/mK) 0.89
Heat Capacity (J/gK) 0.56
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.77 \times 10^{-6} + 2(1.24 \times 10^{-8})\,\Delta T + 3(1.22 \times 10^{-11})\,\Delta T^2 + \frac{5.19 \times 10^{-7} + 2(6.02 \times 10^{-10})\,\Delta T}{\lambda - 0.184}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.221
Relative Cost 11.8
Mechanical Properties
Young's Modulus (GPa) 121.8
Poisson's Ratio 0.3
Knoop Hardness (kgf/mm²) 797.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 1
Acid Resistance 51
Alkali Resistance 1
Phosphate Resistance 2
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-LAH97 Ohara 1.755 52.318818
TAC6L Hoya 1.755 52.32
TAC6 Hoya 1.755 52.32
H-LAK53A CDGM 1.755 52.320574
S-YGH51 Ohara 1.754998 52.321434
H-LAK53B CDGM 1.755 52.322058
YGH51 Ohara 1.754998 52.326713
K-LaSKn1 Sumita 1.755 52.4
LASKN1 Sumita 1.755 52.4
MP-TAC60-90 Hoya 1.75591 51.18
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-LAK33A Schott 1.75393 52.27
LAK33 Schott 1.753977 52.430467
N-LAK33 Schott 1.753977 52.430467
LAK28 Schott 1.744287 50.770906
N-LAK28 Schott 1.74429 50.77
LAK16A Schott 1.733501 51.779678
N-LAF35 Schott 1.7433 49.4
N-LAF34 Schott 1.7725 49.62
LAFN28 Schott 1.773142 49.568242
N-LAK34 Schott 1.72916 54.5
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