LF2 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) | 1.58921 |
|---|---|
| Abbe Number (Vd) | 41.0 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.46786 - 0.00843003\,\lambda^2 + 0.0194144\,\lambda^{-2} + 0.000484939\,\lambda^{-4} + 9.38677 \times 10^{-6}\,\lambda^{-6} + 1.44741 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 10.4 |
| 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) | 3.29 |
|---|---|
| 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 | |
|---|---|---|---|---|
| PBL22 | Ohara | 1.589206 | 41.07921 | |
| LF5G15 | Schott | 1.58397 | 40.83 | |
| PBL35Y | Ohara | 1.581591 | 40.855991 | |
| LF5HT | Schott | 1.581483 | 40.913786 | |
| LF5HTi | Schott | 1.58144 | 40.89 | |
| E-FL5 | Hoya | 1.58144 | 40.89 | |
| H-QF50 | CDGM | 1.58144 | 40.888972 | |
| QF50GTI | CDGM | 1.58144 | 40.885954 | |
| QF50 | CDGM | 1.58144 | 40.885954 | |
| FL5 | Hoya | 1.581437 | 40.887611 |