K-LaSFn4 by Sumita
Standard
Rare
Environmentally Friendly
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) | 1.785 |
|---|---|
| Abbe Number (Vd) | 43.7 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{3.105 - 0.0133425\,\lambda^2 + 0.0275065\,\lambda^{-2} + 0.000754516\,\lambda^{-4} - 1.65657 \times 10^{-5}\,\lambda^{-6} + 2.78048 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.9 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.3 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-6.24 \times 10^{-7} + 2(1.69 \times 10^{-8})\,\Delta T + 3(-1.42 \times 10^{-10})\,\Delta T^2 + \frac{6.93 \times 10^{-7} + 2(1.19 \times 10^{-9})\,\Delta T}{\lambda - 0.208}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.12 |
|---|---|
| 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 | |
|---|---|---|---|---|
| LAFN10 | Schott | 1.784432 | 43.950523 | |
| NBFD11 | Hoya | 1.7859 | 43.94 | |
| N-LAF33 | Schott | 1.78582 | 44.05 | |
| LAH51 | Ohara | 1.785896 | 44.186159 | |
| H-LAF52 | CDGM | 1.7859 | 44.187159 | |
| S-LAH51 | Ohara | 1.785896 | 44.202637 | |
| NBFD1 | Hoya | 1.789004 | 42.757634 | |
| D96-43 | Corning | 1.796195 | 43.217783 | |
| LAH67 | Ohara | 1.794997 | 45.293967 | |
| S-LAH67 | Ohara | 1.794997 | 45.293967 |
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| LASFN4 | Sumita | 1.785 | 43.7 | |
| K-VC100(M) | Sumita | 1.79916 | 43.5 | |
| LASFN19 | Sumita | 1.795 | 45.2 | |
| K-VC179(M) | Sumita | 1.79441 | 41.9 | |
| K-LaSFn3 | Sumita | 1.7995 | 42.3 | |
| LASFN3 | Sumita | 1.7995 | 42.3 | |
| K-VC100 | Sumita | 1.804 | 43.6 | |
| K-VC179 | Sumita | 1.7989 | 41.8 | |
| K-LaSFn16 | Sumita | 1.7883 | 47.4 | |
| LASFN16 | Sumita | 1.7883 | 47.4 |