LAF20 by Schott

Obsolete Unknown Environmentally Dangerous

LAF20 by Schott is an obsolete optical glass. It transmits from 0.35 to 2.33 µm with an nd of 1.682476 and a Vd of 48.200977. It has medium thermal expansion (CTE of 7.4×10⁻⁶/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) 1.682476
Abbe Number (Vd) 48.200977
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.65107\,\lambda^2}{\lambda^2 - 0.00970502} + \frac{0.118475\,\lambda^2}{\lambda^2 - 0.0428927} + \frac{1.11549\,\lambda^2}{\lambda^2 - 114.058}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.4
TCE 100/300°C (10-6/K) 8.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-7.01 \times 10^{-7} + 2(8.04 \times 10^{-9})\,\Delta T + 3(-2.56 \times 10^{-11})\,\Delta T^2 + \frac{7.6 \times 10^{-7} + 2(7.56 \times 10^{-10})\,\Delta T}{\lambda - 0.129}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.87
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

old

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LAFL20 Hoya 1.68248 48.197606
LAFN1 Sumita 1.685 49.2
LAFL1 Hoya 1.686004 49.347081
LAFL23 Hoya 1.689 49.475821
C90-50 Corning 1.689009 49.625392
H-ZBAF5 CDGM 1.67103 47.288963
H-LAF1 CDGM 1.69362 49.193837
BAH10 Ohara 1.670029 47.253429
S-BAH10 Ohara 1.670029 47.230916
BAF10 Hoya 1.67003 47.2
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
LAFN23 Schott 1.689004 49.711581
N-BAF10 Schott 1.67003 47.11
BAFN10 Schott 1.670031 47.108735
BAFN11 Schott 1.666721 48.421391
BAF50 Schott 1.682726 44.503507
BAF13 Schott 1.668919 44.961828
N-SSK5 Schott 1.65844 50.88
SSKN5 Schott 1.65844 50.882921
LAF3 Schott 1.716998 47.961124
N-LAF3 Schott 1.717 47.96
Compare Glasses
    Compare Selected