LASFN31 by Schott

Obsolete Unknown Environmentally Dangerous

LASFN31 by Schott is an obsolete optical glass. It transmits from 0.33 to 2.50 µm with an nd of 1.880669 and a Vd of 41.009774. It has medium thermal expansion (CTE of 6.8×10⁻⁶/K), excellent chemical resistance, extreme relative cost, and dangerous environmental properties.

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) 1.880669
Abbe Number (Vd) 41.009774
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.71317\,\lambda^2}{\lambda^2 - 0.00819172} + \frac{0.718575\,\lambda^2}{\lambda^2 - 0.0297802} + \frac{1.72332\,\lambda^2}{\lambda^2 - 138.461}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.8
TCE 100/300°C (10-6/K) 7.7
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.29 \times 10^{-6} + 2(8.93 \times 10^{-9})\,\Delta T + 3(-1.59 \times 10^{-11})\,\Delta T^2 + \frac{6.52 \times 10^{-7} + 2(8.09 \times 10^{-10})\,\Delta T}{\lambda - 0.236}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.41
Relative Cost 60.09
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 2
Alkali Resistance 1
Phosphate Resistance 1
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LASFN17 Sumita 1.883 40.9
H-ZLAF68C CDGM 1.883 40.847465
TAFD30 Hoya 1.883 40.81
H-ZLAF68B CDGM 1.883004 40.806875
K-LaSFn17 Sumita 1.883 40.8
LAH58 Ohara 1.882997 40.778667
S-LAH58 Ohara 1.882997 40.765107
H-ZLAF73 CDGM 1.881 40.161331
TAFD33 Hoya 1.881 40.14
TAFD32 Hoya 1.8707 40.73
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-LASF31 Schott 1.88067 41.01
N-LASF31A Schott 1.883 40.76
LASFN15 Schott 1.878001 38.072485
N-LASF41 Schott 1.83501 43.13
N-LASF40 Schott 1.83404 37.3
LASF14A Schott 1.822226 37.454652
P-LASF51 Schott 1.81 40.93
LASF18A Schott 1.913482 32.364492
N-LASF9HT Schott 1.85025 32.17
N-LASF9 Schott 1.85025 32.17
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