TAFD25 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) | 1.90366 |
|---|---|
| Abbe Number (Vd) | 31.32 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{3.49055 - 0.0163258\,\lambda^2 + 0.0411463\,\lambda^{-2} + 0.00271691\,\lambda^{-4} - 0.000182605\,\lambda^{-6} + 2.06419 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.0 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.8 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.77 \times 10^{-7} + 2(7.51 \times 10^{-9})\,\Delta T + 3(-2.95 \times 10^{-11})\,\Delta T^2 + \frac{1.02 \times 10^{-6} + 2(9.45 \times 10^{-10})\,\Delta T}{\lambda - 0.245}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.51 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 1 |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Recommended glass type
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| N-LASF46A | Schott | 1.90366 | 31.32 | |
| N-LASF46B | Schott | 1.90366 | 31.32 | |
| H-ZLAF75A | CDGM | 1.90366 | 31.31497 | |
| S-LAH95 | Ohara | 1.903659 | 31.343065 | |
| H-ZLAF75C | CDGM | 1.90366 | 31.357126 | |
| H-ZLAF75B | CDGM | 1.90366 | 31.418411 | |
| L-LAH86 | Ohara | 1.902699 | 31.00532 | |
| LAH78 | Ohara | 1.901355 | 31.550244 | |
| N-LASF46 | Schott | 1.90138 | 31.64 | |
| SRMOO4 | Generic Birefringent | 1.908806 | 29.94765 |