FEL6 by Hoya
Obsolete
Unknown
Environmentally Dangerous
FEL6 by Hoya is an obsolete optical glass. It transmits from 0.30 to 1.55 µm with an nd of 1.53172 and a Vd of 48.837531. It has medium thermal expansion (CTE of 8.9×10⁻⁶/K), good chemical resistance, and dangerous environmental properties.
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) | 48.837531 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.25 — 1.55 µm |
$$n(\lambda) = \sqrt{2.30403 - 0.00781836\,\lambda^2 + 0.0144322\,\lambda^{-2} + 0.000414552\,\lambda^{-4} - 2.64598 \times 10^{-5}\,\lambda^{-6} + 2.76666 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.9 |
|---|---|
| TCE 100/300°C (10-6/K) | — |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.35969 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | 1 |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| H-QF6A | CDGM | 1.53172 | 48.839833 | |
| S-TIL6 | Ohara | 1.531717 | 48.840718 | |
| N-LLF6 | Schott | 1.531688 | 48.895238 | |
| LLF6 | Sumita | 1.53172 | 48.9 | |
| PBL6 | Ohara | 1.531717 | 48.904553 | |
| LLF6 | Schott | 1.531719 | 48.762595 | |
| QF6 | CDGM | 1.531719 | 48.755584 | |
| PBL6Y | Ohara | 1.531717 | 48.956017 | |
| LLF6HT | Schott | 1.531739 | 48.974492 | |
| PBL2 | Ohara | 1.54072 | 47.23368 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| E-FEL6 | Hoya | 1.53172 | 48.84 | |
| E-FEL2 | Hoya | 1.54072 | 47.2 | |
| FEL2 | Hoya | 1.540718 | 47.198247 | |
| CF2 | Hoya | 1.526296 | 51.046045 | |
| CF5 | Hoya | 1.5231 | 50.951831 | |
| CF4 | Hoya | 1.533577 | 51.545117 | |
| SBF1 | Hoya | 1.551151 | 49.517289 | |
| SBF2 | Hoya | 1.52944 | 51.643052 | |
| FF2 | Hoya | 1.532561 | 45.942878 | |
| FF1 | Hoya | 1.511179 | 51.02769 |