K-LaFn3 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) | 1.7 |
|---|---|
| Abbe Number (Vd) | 48.0 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{2.82708 - 0.0102207\,\lambda^2 + 0.0212241\,\lambda^{-2} + 0.000665396\,\lambda^{-4} - 3.33165 \times 10^{-5}\,\lambda^{-6} + 3.16429 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.3 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.6 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-3.22 \times 10^{-6} + 2(1.12 \times 10^{-8})\,\Delta T + 3(-3.14 \times 10^{-10})\,\Delta T^2 + \frac{6.46 \times 10^{-7} + 2(6.47 \times 10^{-10})\,\Delta T}{\lambda - 0.204}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.02 |
|---|---|
| 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 | |
|---|---|---|---|---|
| LAM51 | Ohara | 1.699998 | 48.078869 | |
| H-LAF51 | CDGM | 1.7 | 48.079839 | |
| S-LAM51 | Ohara | 1.699998 | 48.080479 | |
| LAFL3 | Hoya | 1.700301 | 47.836538 | |
| LAFL2 | Hoya | 1.697 | 48.514006 | |
| S-LAM59 | Ohara | 1.697002 | 48.516066 | |
| LAM59 | Ohara | 1.697002 | 48.535864 | |
| H-LAF1 | CDGM | 1.69362 | 49.193837 | |
| LAFL23 | Hoya | 1.689 | 49.475821 | |
| C90-50 | Corning | 1.689009 | 49.625392 |