K-LaFK58 by Sumita
Preferred
Medium
Precision Molding
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) | 1.6956 |
|---|---|
| Abbe Number (Vd) | 59.0 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{2.82624 - 0.0127831\,\lambda^2 + 0.0172545\,\lambda^{-2} + 0.000434877\,\lambda^{-4} - 1.93423 \times 10^{-5}\,\lambda^{-6} + 1.18082 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.9 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.3 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.73 \times 10^{-6} + 2(9.33 \times 10^{-9})\,\Delta T + 3(-1.14 \times 10^{-10})\,\Delta T^2 + \frac{4.36 \times 10^{-7} + 2(4.83 \times 10^{-10})\,\Delta T}{\lambda - 0.169}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.56 |
|---|---|
| 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 | |
|---|---|---|---|---|
| LAK31 | Schott | 1.696732 | 56.420174 | |
| C97-56 | Corning | 1.697 | 56.222926 | |
| H-LAK12 | CDGM | 1.6968 | 56.175305 | |
| LAC15 | Hoya | 1.6968 | 56.114704 | |
| SPINEL | Generic IR | 1.716226 | 60.607355 | |
| S-LAL14 | Ohara | 1.696797 | 55.532241 | |
| LAL14 | Ohara | 1.696796 | 55.528037 | |
| H-LAK51A | CDGM | 1.6968 | 55.526357 | |
| MP-LAC14-80 | Hoya | 1.6976 | 55.51 | |
| M-LAC14 | Hoya | 1.6968 | 55.46 |
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| K-LaFK58(M) | Sumita | 1.69097 | 58.4 | |
| LAFK55 | Sumita | 1.694 | 56.3 | |
| K-LaFK55 | Sumita | 1.694 | 56.3 | |
| K-LaFK55(M) | Sumita | 1.68875 | 55.8 | |
| K-LaK14 | Sumita | 1.6968 | 55.6 | |
| LAK14 | Sumita | 1.6968 | 55.6 | |
| LAKN4 | Sumita | 1.671 | 57.2 | |
| K-LaKn4 | Sumita | 1.671 | 57.2 | |
| LAK12 | Sumita | 1.6779 | 55.5 | |
| K-LaK12 | Sumita | 1.6779 | 55.5 |