LASFN15 by Schott

Obsolete Unknown Environmentally Dangerous

LASFN15 by Schott is an obsolete optical glass. It transmits from 0.35 to 2.33 µm with an nd of 1.878001 and a Vd of 38.072485. It has low thermal expansion (CTE of 6.5×10⁻⁶/K) and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.350–2.325 µm
Optical Properties
Refractive Index (nd) 1.878001
Abbe Number (Vd) 38.072485
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{2.08895\,\lambda^2}{\lambda^2 - 0.0109013} + \frac{0.327776\,\lambda^2}{\lambda^2 - 0.0435008} + \frac{1.52129\,\lambda^2}{\lambda^2 - 101.184}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.5
TCE 100/300°C (10-6/K) 7.3
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.09 \times 10^{-6} + 2(9.92 \times 10^{-9})\,\Delta T + 3(-1.53 \times 10^{-11})\,\Delta T^2 + \frac{7.58 \times 10^{-7} + 2(1.02 \times 10^{-9})\,\Delta T}{\lambda - 0.224}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.75
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
TAFD17 Hoya 1.877999 38.197051
E78-38 Corning 1.878005 38.494794
MC-TAFD317 Hoya 1.8812 37.17
MP-TAFD307 Hoya 1.88202 37.22
MC-TAFD307 Hoya 1.88202 37.22
M-TAFD307 Hoya 1.88202 37.22
D-ZLAF67-25 CDGM 1.88259 37.185491
D-ZLAF67 CDGM 1.88385 37.198899
H-ZLAF68N CDGM 1.883 39.2182
H-ZLAF68NB CDGM 1.883 39.235474
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-LASF31A Schott 1.883 40.76
LASFN31 Schott 1.880669 41.009774
N-LASF31 Schott 1.88067 41.01
N-LASF40 Schott 1.83404 37.3
N-LASF9HT Schott 1.85025 32.17
LASFN9 Schott 1.85025 32.17
N-LASF9 Schott 1.85025 32.17
N-LASF46 Schott 1.90138 31.64
LASF18A Schott 1.913482 32.364492
LASF14A Schott 1.822226 37.454652
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