LASF18A by Schott

Obsolete Unknown Environmentally Dangerous

LASF18A by Schott is an obsolete optical glass. It transmits from 0.37 to 2.33 µm with an nd of 1.913482 and a Vd of 32.364492. It has low thermal expansion (CTE of 6.0×10⁻⁶/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: 0.370–2.325 µm
Optical Properties
Refractive Index (nd) 1.913482
Abbe Number (Vd) 32.364492
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{2.19337\,\lambda^2}{\lambda^2 - 0.0121931} + \frac{0.33259\,\lambda^2}{\lambda^2 - 0.053252} + \frac{1.6985\,\lambda^2}{\lambda^2 - 106.853}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.0
TCE 100/300°C (10-6/K) 7.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.87 \times 10^{-6} + 2(1.15 \times 10^{-8})\,\Delta T + 3(-3.11 \times 10^{-11})\,\Delta T^2 + \frac{8.68 \times 10^{-7} + 2(1.23 \times 10^{-9})\,\Delta T}{\lambda - 0.254}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.82
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
S-LAH88 Ohara 1.916499 31.604148
H-ZLAF75B CDGM 1.90366 31.418411
H-ZLAF75C CDGM 1.90366 31.357126
S-LAH95 Ohara 1.903659 31.343065
TAFD25 Hoya 1.90366 31.32
TAFD25L Hoya 1.90366 31.32
H-ZLAF75A CDGM 1.90366 31.31497
LAH78 Ohara 1.901355 31.550244
L-LAH86 Ohara 1.902699 31.00532
SRMOO4 Generic Birefringent 1.908806 29.94765
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-LASF46A Schott 1.90366 31.32
N-LASF46B Schott 1.90366 31.32
N-LASF46 Schott 1.90138 31.64
N-LASF55 Schott 1.9538 30.56
LASFN15 Schott 1.878001 38.072485
N-LASF9 Schott 1.85025 32.17
LASFN9 Schott 1.85025 32.17
N-LASF9HT Schott 1.85025 32.17
N-LASF31A Schott 1.883 40.76
LASFN31 Schott 1.880669 41.009774
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