K-LaFn11 by Sumita

Standard Rare Environmentally Friendly

K-LaFn11 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.72013 and a Vd of 46.0. It has medium thermal expansion (CTE of 8.1×10⁻⁶/K) and average chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.340–2.000 µm
Optical Properties
Refractive Index (nd) 1.72013
Abbe Number (Vd) 46.0
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.8917 - 0.0119209\,\lambda^2 + 0.0225589\,\lambda^{-2} + 0.000792042\,\lambda^{-4} - 4.08204 \times 10^{-5}\,\lambda^{-6} + 4.1373 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.1
TCE 100/300°C (10-6/K) 8.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-5.4 \times 10^{-7} + 2(2.18 \times 10^{-8})\,\Delta T + 3(-2.46 \times 10^{-10})\,\Delta T^2 + \frac{5.35 \times 10^{-7} + 2(-3.35 \times 10^{-10})\,\Delta T}{\lambda - 0.243}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.88
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-LAM61 Ohara 1.720002 46.024571
LAM61 Ohara 1.720002 46.035166
H-LAF2 CDGM 1.717 47.888609
S-LAM3 Ohara 1.717004 47.927969
LAM3 Ohara 1.717004 47.942632
N-LAF3 Schott 1.717 47.96
LAF3 Schott 1.716998 47.961124
LAF30 Hoya 1.717 47.97772
LAF3 Hoya 1.717 47.98
D17-48 Corning 1.717011 47.998493
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LAFN11 Sumita 1.72013 46.0
LAF3 Sumita 1.717 47.9
LAFN4 Sumita 1.72 43.7
LAFN3 Sumita 1.7 48.0
K-LaFn3 Sumita 1.7 48.0
K-LaF2 Sumita 1.744 44.9
LAF2 Sumita 1.744 44.9
K-VC174(M) Sumita 1.74578 45.1
LAFN10 Sumita 1.72016 42.1
K-VC174 Sumita 1.7485 45.3
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