TAC4 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) | 1.734 |
|---|---|
| Abbe Number (Vd) | 51.05 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{2.94256 - 0.0132666\,\lambda^2 + 0.0235592\,\lambda^{-2} - 0.00016399\,\lambda^{-4} + 9.23708 \times 10^{-5}\,\lambda^{-6} - 4.8616 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 5.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 6.6 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[9.29549 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.06 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 3 |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Not in a position to accept new order because of discontinuation.
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| LAKN12 | Sumita | 1.7335 | 51.2 | |
| D34-51 | Corning | 1.733513 | 51.387663 | |
| S-LAL59 | Ohara | 1.733997 | 51.47057 | |
| H-LAK54 | CDGM | 1.734 | 51.485829 | |
| LAL59 | Ohara | 1.733997 | 51.488026 | |
| LAK16A | Schott | 1.733501 | 51.779678 | |
| LAK28 | Schott | 1.744287 | 50.770906 | |
| N-LAK28 | Schott | 1.74429 | 50.77 | |
| LAFN7 | Sumita | 1.735 | 49.5 | |
| H-LAK3 | CDGM | 1.74693 | 50.950085 |