LAF3 by Schott

Obsolete Unknown Environmentally Dangerous

LAF3 by Schott is an obsolete optical glass. It transmits from 0.35 to 2.50 µm with an nd of 1.716998 and a Vd of 47.961124. It has medium thermal expansion (CTE of 7.6×10⁻⁶/K), below average chemical resistance, moderate 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: 0.350–2.500 µm
Optical Properties
Refractive Index (nd) 1.716998
Abbe Number (Vd) 47.961124
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.73156\,\lambda^2}{\lambda^2 - 0.00953834} + \frac{0.150874\,\lambda^2}{\lambda^2 - 0.0407887} + \frac{1.06587\,\lambda^2}{\lambda^2 - 98.0759}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.6
TCE 100/300°C (10-6/K) 8.7
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.35 \times 10^{-6} + 2(1.07 \times 10^{-8})\,\Delta T + 3(-9.38 \times 10^{-12})\,\Delta T^2 + \frac{5.72 \times 10^{-7} + 2(6.01 \times 10^{-10})\,\Delta T}{\lambda - 0.22}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.14
Relative Cost 5.39
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance 3
Acid Resistance 52
Alkali Resistance 1
Phosphate Resistance 3
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LAF30 Hoya 1.717 47.97772
LAM3 Ohara 1.717004 47.942632
LAF3 Hoya 1.717 47.98
S-LAM3 Ohara 1.717004 47.927969
D17-48 Corning 1.717011 47.998493
LAF3 Sumita 1.717 47.9
H-LAF2 CDGM 1.717 47.888609
LAM61 Ohara 1.720002 46.035166
S-LAM61 Ohara 1.720002 46.024571
K-LaFn11 Sumita 1.72013 46.0
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-LAF3 Schott 1.717 47.96
LAK10 Schott 1.72 50.41004
N-LAK10 Schott 1.72003 50.62
N-LAF35 Schott 1.7433 49.4
LAFN23 Schott 1.689004 49.711581
LAK16A Schott 1.733501 51.779678
N-LAK28 Schott 1.74429 50.77
LAK28 Schott 1.744287 50.770906
LAF20 Schott 1.682476 48.200977
N-LAF2 Schott 1.74397 44.85
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