LLF2 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) | 1.54072 |
|---|---|
| Abbe Number (Vd) | 47.2 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.33034 - 0.0088935\,\lambda^2 + 0.0148778\,\lambda^{-2} + 0.000426696\,\lambda^{-4} - 1.00884 \times 10^{-5}\,\lambda^{-6} + 1.67264 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 9.3 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 2.87 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| E-FEL2 | Hoya | 1.54072 | 47.2 | |
| FEL2 | Hoya | 1.540718 | 47.198247 | |
| QF8 | CDGM | 1.540718 | 47.198243 | |
| S-TIL2 | Ohara | 1.54072 | 47.227127 | |
| LLF2 | Schott | 1.540719 | 47.171344 | |
| H-QF8 | CDGM | 1.54072 | 47.230007 | |
| PBL2 | Ohara | 1.54072 | 47.23368 | |
| QF70GFI | CDGM | 1.547 | 48.161896 | |
| LLF1HTi | Schott | 1.54815 | 45.9 | |
| QF1 | CDGM | 1.5481 | 45.886233 |