LASFN9 by Sumita
Obsolete
Very Rare
Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
| Refractive Index (nd) | 1.816 |
|---|---|
| Abbe Number (Vd) | 46.7 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{3.21664 - 0.0139394\,\lambda^2 + 0.0280893\,\lambda^{-2} + 0.000540311\,\lambda^{-4} + 3.2097 \times 10^{-6}\,\lambda^{-6} + 1.06807 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 7.6 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.96 |
|---|---|
| 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)
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| K-LaSFn9 | Sumita | 1.816 | 46.7 | |
| K-LaSFn6 | Sumita | 1.804 | 46.6 | |
| LASFN6 | Sumita | 1.80235 | 46.7 | |
| LASFN10 | Sumita | 1.8155 | 44.4 | |
| K-LaSFn10 | Sumita | 1.8155 | 44.4 | |
| LASFN19 | Sumita | 1.795 | 45.2 | |
| K-VC100 | Sumita | 1.804 | 43.6 | |
| LASFN16 | Sumita | 1.7883 | 47.4 | |
| K-LaSFn16 | Sumita | 1.7883 | 47.4 | |
| K-VC100(M) | Sumita | 1.79916 | 43.5 |