K-LaSFn16 by Sumita

Standard Rare Environmentally Friendly

K-LaSFn16 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.32 to 2.00 µm with an nd of 1.7883 and a Vd of 47.4. It has low thermal expansion (CTE of 5.4×10⁻⁶/K) and good 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: 0.320–2.000 µm
Optical Properties
Refractive Index (nd) 1.7883
Abbe Number (Vd) 47.4
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{3.12453 - 0.014985\,\lambda^2 + 0.0247959\,\lambda^{-2} + 0.000962716\,\lambda^{-4} - 6.4587 \times 10^{-5}\,\lambda^{-6} + 4.61624 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.4
TCE 100/300°C (10-6/K) 7.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.27 \times 10^{-6} + 2(1.53 \times 10^{-8})\,\Delta T + 3(-2.61 \times 10^{-10})\,\Delta T^2 + \frac{5.42 \times 10^{-7} + 2(5.61 \times 10^{-10})\,\Delta T}{\lambda - 0.206}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.76
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
D88-47 Corning 1.788001 47.412327
LAH64 Ohara 1.788001 47.385275
S-LAH64 Ohara 1.788001 47.368522
LAFN21 Schott 1.788309 47.470398
TAF4 Hoya 1.788 47.49
N-LAF21 Schott 1.788 47.49
H-LAF10LA CDGM 1.788 47.491731
TAF48 Hoya 1.79091 48.09
M-TAF401 Hoya 1.77377 47.17
MC-TAF401 Hoya 1.77377 47.17
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LASFN16 Sumita 1.7883 47.4
LASFN6 Sumita 1.80235 46.7
K-LaSFn6 Sumita 1.804 46.6
LASFN19 Sumita 1.795 45.2
K-LaSFn7 Sumita 1.7725 49.6
LASFN7 Sumita 1.7725 49.6
K-LaFK50 Sumita 1.772 50.0
K-LaFK50(M) Sumita 1.76831 49.7
LASKN3 Sumita 1.774 50.5
K-LaSFn4 Sumita 1.785 43.7
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