N-LASF44 by Schott

Preferred Unknown Environmentally Friendly

N-LASF44 by Schott is a preferred optical glass. It transmits from 0.33 to 2.50 µm with an nd of 1.8042 and a Vd of 46.5. It has low thermal expansion (CTE of 6.21×10⁻⁶/K), average chemical resistance, and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.334–2.500 µm
Optical Properties
Refractive Index (nd) 1.8042
Abbe Number (Vd) 46.5
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.78897\,\lambda^2}{\lambda^2 - 0.00872506} + \frac{0.386759\,\lambda^2}{\lambda^2 - 0.0308085} + \frac{1.30506\,\lambda^2}{\lambda^2 - 92.7744}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.21
TCE 100/300°C (10-6/K) 7.39
Thermal Conductivity (W/mK) 0.82
Heat Capacity (J/gK) 0.53
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.32 \times 10^{-6} + 2(1.12 \times 10^{-8})\,\Delta T + 3(-8.52 \times 10^{-12})\,\Delta T^2 + \frac{5.88 \times 10^{-7} + 2(7.13 \times 10^{-10})\,\Delta T}{\lambda - 0.209}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.44
Relative Cost 7.5
Mechanical Properties
Young's Modulus (GPa) 124.0
Poisson's Ratio 0.29
Knoop Hardness (kgf/mm²) 770.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 1
Acid Resistance 4
Alkali Resistance 1
Phosphate Resistance 1
Notes

step 0.5 available

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
TAF3D Hoya 1.8042 46.5
TAF3 Hoya 1.8042 46.5
S-LAH65VS Ohara 1.804 46.527532
S-LAH65 Ohara 1.804 46.570373
H-ZLAF50E CDGM 1.804 46.574487
H-ZLAF50D CDGM 1.804 46.575016
LAH65 Ohara 1.804 46.575911
S-LAH65V Ohara 1.803999 46.583432
K-LaSFn6 Sumita 1.804 46.6
E03-47 Corning 1.803002 46.408629
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
LASFN30 Schott 1.803181 46.379894
N-LAF32 Schott 1.79457 45.53
LAFN21 Schott 1.788309 47.470398
N-LAF21 Schott 1.788 47.49
N-LAF33 Schott 1.78582 44.05
LAFN10 Schott 1.784432 43.950523
N-LAF36 Schott 1.79952 42.37
LAFN28 Schott 1.773142 49.568242
N-LAF34 Schott 1.7725 49.62
N-LASF41 Schott 1.83501 43.13
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