N-LASF41 by Schott

Preferred Unknown Environmentally Friendly

N-LASF41 by Schott is a preferred optical glass. It transmits from 0.33 to 2.50 µm with an nd of 1.83501 and a Vd of 43.13. It has low thermal expansion (CTE of 6.19×10⁻⁶/K), average chemical resistance, and high 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) 1.83501
Abbe Number (Vd) 43.13
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.86348\,\lambda^2}{\lambda^2 - 0.00910368} + \frac{0.413307\,\lambda^2}{\lambda^2 - 0.0339247} + \frac{1.35785\,\lambda^2}{\lambda^2 - 93.3581}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.19
TCE 100/300°C (10-6/K) 7.33
Thermal Conductivity (W/mK) 0.79
Heat Capacity (J/gK) 0.49
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.03 \times 10^{-6} + 2(1.04 \times 10^{-8})\,\Delta T + 3(-1.3 \times 10^{-11})\,\Delta T^2 + \frac{6.62 \times 10^{-7} + 2(7.82 \times 10^{-10})\,\Delta T}{\lambda - 0.209}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.845
Relative Cost 11.5
Mechanical Properties
Young's Modulus (GPa) 124.0
Poisson's Ratio 0.29
Knoop Hardness (kgf/mm²) 760.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 1
Acid Resistance 4
Alkali Resistance 1
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
TAFD5 Hoya 1.835 42.984244
S-LAH55VS Ohara 1.834809 42.74368
S-LAH55V Ohara 1.834807 42.725324
H-ZLAF55D CDGM 1.83481 42.725177
LAH55 Ohara 1.834807 42.72372
TAFD5F Hoya 1.83481 42.72
TAFD5G Hoya 1.83481 42.72
S-LAH55 Ohara 1.834807 42.713673
H-ZLAF55C CDGM 1.83481 42.711575
K-LaSFn8 Sumita 1.835 42.7
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
P-LASF51 Schott 1.81 40.93
LASF3 Schott 1.808009 40.610164
P-LASF50 Schott 1.8086 40.46
P-LASF47 Schott 1.8061 40.9
N-LASF43 Schott 1.8061 40.61
N-LAF36 Schott 1.79952 42.37
N-LASF44 Schott 1.8042 46.5
LASFN30 Schott 1.803181 46.379894
N-LASF40 Schott 1.83404 37.3
LASF14A Schott 1.822226 37.454652
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