LLF6 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) | 1.53172 |
|---|---|
| Abbe Number (Vd) | 48.9 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.3027 - 0.00731109\,\lambda^2 + 0.0156565\,\lambda^{-2} - 6.44047 \times 10^{-5}\,\lambda^{-4} + 5.44375 \times 10^{-5}\,\lambda^{-6} - 1.98654 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 10.1 |
| 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) | 2.78 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| PBL6 | Ohara | 1.531717 | 48.904553 | |
| N-LLF6 | Schott | 1.531688 | 48.895238 | |
| PBL6Y | Ohara | 1.531717 | 48.956017 | |
| S-TIL6 | Ohara | 1.531717 | 48.840718 | |
| E-FEL6 | Hoya | 1.53172 | 48.84 | |
| H-QF6A | CDGM | 1.53172 | 48.839833 | |
| FEL6 | Hoya | 1.53172 | 48.837531 | |
| LLF6HT | Schott | 1.531739 | 48.974492 | |
| LLF6 | Schott | 1.531719 | 48.762595 | |
| QF6 | CDGM | 1.531719 | 48.755584 |