K-LaSFn2 by Sumita
Standard
Medium
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) | 1.805 |
|---|---|
| Abbe Number (Vd) | 39.6 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{3.16665 - 0.014823\,\lambda^2 + 0.0303661\,\lambda^{-2} + 0.00109429\,\lambda^{-4} - 4.21086 \times 10^{-5}\,\lambda^{-6} + 5.71868 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 5.6 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.26 \times 10^{-6} + 2(1.83 \times 10^{-8})\,\Delta T + 3(-3.28 \times 10^{-10})\,\Delta T^2 + \frac{7.62 \times 10^{-7} + 2(8.92 \times 10^{-10})\,\Delta T}{\lambda - 0.222}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.13 |
|---|---|
| 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 | |
|---|---|---|---|---|
| H-ZLAF51 | CDGM | 1.8045 | 39.635248 | |
| NBFD3 | Hoya | 1.8045 | 39.64 | |
| S-LAH63 | Ohara | 1.804398 | 39.58615 | |
| S-LAH63Q | Ohara | 1.8044 | 39.580489 | |
| LAH63 | Ohara | 1.804398 | 39.581254 | |
| L-LAH81 | Ohara | 1.8061 | 40.400738 | |
| P-LASF50 | Schott | 1.8086 | 40.46 | |
| N-LASF43 | Schott | 1.8061 | 40.61 | |
| L-LAH84 | Ohara | 1.80835 | 40.548503 | |
| LASF3 | Schott | 1.808009 | 40.610164 |
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| LASFN2 | Sumita | 1.805 | 39.6 | |
| LASFN1 | Sumita | 1.806 | 40.7 | |
| K-LaSFn1 | Sumita | 1.8061 | 40.7 | |
| K-VC89(M) | Sumita | 1.8059 | 40.9 | |
| K-VC181(M) | Sumita | 1.80614 | 41.1 | |
| K-VC89 | Sumita | 1.81 | 41.0 | |
| K-VC181 | Sumita | 1.81055 | 41.1 | |
| K-VC179 | Sumita | 1.7989 | 41.8 | |
| K-VC179(M) | Sumita | 1.79441 | 41.9 | |
| K-LaSFn3 | Sumita | 1.7995 | 42.3 |