N-LASF40 by Schott

Preferred Unknown Environmentally Friendly

N-LASF40 by Schott is a preferred optical glass. It transmits from 0.36 to 2.50 µm with an nd of 1.83404 and a Vd of 37.3. It has low thermal expansion (CTE of 5.84×10⁻⁶/K), below average chemical resistance, and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.365–2.500 µm
Optical Properties
Refractive Index (nd) 1.83404
Abbe Number (Vd) 37.3
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.9855\,\lambda^2}{\lambda^2 - 0.0109583} + \frac{0.274057\,\lambda^2}{\lambda^2 - 0.0474552} + \frac{1.28946\,\lambda^2}{\lambda^2 - 96.9085}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.84
TCE 100/300°C (10-6/K) 6.9
Thermal Conductivity (W/mK) 0.81
Heat Capacity (J/gK) 0.55
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[8.1 \times 10^{-6} + 2(1.25 \times 10^{-8})\,\Delta T + 3(-1.73 \times 10^{-11})\,\Delta T^2 + \frac{8.27 \times 10^{-7} + 2(1.08 \times 10^{-9})\,\Delta T}{\lambda - 0.238}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.43
Relative Cost 4.9
Mechanical Properties
Young's Modulus (GPa) 111.0
Poisson's Ratio 0.3
Knoop Hardness (kgf/mm²) 580.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 1
Acid Resistance 51
Alkali Resistance 1
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
K-LaSFn14 Sumita 1.834 37.3
NBFD10 Hoya 1.834 37.34
M-NBFD10 Hoya 1.83441 37.29
MP-NBFD10-20 Hoya 1.83461 37.29
H-ZLAF53B CDGM 1.834 37.210555
H-ZLAF53BGT CDGM 1.834 37.210555
S-LAH60V Ohara 1.833999 37.206855
LASFN14 Sumita 1.834 37.2
S-LAH60MQ Ohara 1.833999 37.172099
LAH60 Ohara 1.834 37.166863
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
LASF14A Schott 1.822226 37.454652
P-LASF50 Schott 1.8086 40.46
LASF3 Schott 1.808009 40.610164
P-LASF51 Schott 1.81 40.93
LASF33 Schott 1.805958 34.242133
N-LASF43 Schott 1.8061 40.61
N-LASF45 Schott 1.80107 34.97
N-LASF45HT Schott 1.80107 34.97
P-LASF47 Schott 1.8061 40.9
LASF36A Schott 1.797117 35.080117
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