FEL4 by Hoya
Obsolete
Unknown
Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
No transmission data available.
Optical Properties
| Refractive Index (nd) | 1.561379 |
|---|---|
| Abbe Number (Vd) | 45.226718 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{2.38872 - 0.00820679\,\lambda^2 + 0.0169727\,\lambda^{-2} + 0.000283854\,\lambda^{-4} + 1.82034 \times 10^{-5}\,\lambda^{-6} + 3.88924 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | — |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
| Density (g/cm³) | — |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| LLF4 | Sumita | 1.56138 | 45.3 | |
| LF8 | Schott | 1.564435 | 43.75028 | |
| IRG7 | Generic IR | 1.564424 | 43.736647 | |
| LLF7 | Schott | 1.548831 | 45.40834 | |
| LLF7 | Sumita | 1.54869 | 45.4 | |
| PBL7 | Ohara | 1.548689 | 45.555746 | |
| PBL1Y | Ohara | 1.548141 | 45.733282 | |
| B48-46 | Corning | 1.548098 | 45.718533 | |
| LLF1 | Schott | 1.54814 | 45.75 | |
| PBL1 | Ohara | 1.548141 | 45.781144 |