TAF4 by Hoya
Special
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) | 1.788 |
|---|---|
| Abbe Number (Vd) | 47.49 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{3.12123 - 0.0141199\,\lambda^2 + 0.0265206\,\lambda^{-2} + 0.000404158\,\lambda^{-4} + 1.42606 \times 10^{-5}\,\lambda^{-6} + 3.16426 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 5.8 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.4 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.51099 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.54 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 2 |
| Acid Resistance | 3 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Not in a position to accept new order because of discontinuation.
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| N-LAF21 | Schott | 1.788 | 47.49 | |
| H-LAF10LA | CDGM | 1.788 | 47.491731 | |
| LAFN21 | Schott | 1.788309 | 47.470398 | |
| D88-47 | Corning | 1.788001 | 47.412327 | |
| K-LaSFn16 | Sumita | 1.7883 | 47.4 | |
| LASFN16 | Sumita | 1.7883 | 47.4 | |
| LAH64 | Ohara | 1.788001 | 47.385275 | |
| S-LAH64 | Ohara | 1.788001 | 47.368522 | |
| LASFN6 | Sumita | 1.80235 | 46.7 | |
| H-ZLAF2A | CDGM | 1.80279 | 46.761307 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| TAF48 | Hoya | 1.79091 | 48.09 | |
| MC-TAF401 | Hoya | 1.77377 | 47.17 | |
| M-TAF401 | Hoya | 1.77377 | 47.17 | |
| MP-TAF401 | Hoya | 1.77377 | 47.17 | |
| TAF2 | Hoya | 1.7945 | 45.39 | |
| TAF3 | Hoya | 1.8042 | 46.5 | |
| TAF3D | Hoya | 1.8042 | 46.5 | |
| MC-TAF31-15 | Hoya | 1.80154 | 45.47 | |
| MP-TAF31-15 | Hoya | 1.80154 | 45.47 | |
| M-TAF31 | Hoya | 1.80139 | 45.45 |