TAFD20 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) | 1.90315 |
|---|---|
| Abbe Number (Vd) | 29.835563 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{3.48514 - 0.0172006\,\lambda^2 + 0.0408385\,\lambda^{-2} + 0.00349092\,\lambda^{-4} - 0.000280844\,\lambda^{-6} + 2.86509 \times 10^{-5}\,\lambda^{-8}}$$
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 | |
|---|---|---|---|---|
| SRMOO4 | Generic Birefringent | 1.908806 | 29.94765 | |
| L-LAH86 | Ohara | 1.902699 | 31.00532 | |
| H-ZLAF75A | CDGM | 1.90366 | 31.31497 | |
| N-LASF46A | Schott | 1.90366 | 31.32 | |
| N-LASF46B | Schott | 1.90366 | 31.32 | |
| S-LAH95 | Ohara | 1.903659 | 31.343065 | |
| H-ZLAF75C | CDGM | 1.90366 | 31.357126 | |
| IRG2 | Generic IR | 1.891717 | 29.896648 | |
| H-ZLAF75B | CDGM | 1.90366 | 31.418411 | |
| LAH78 | Ohara | 1.901355 | 31.550244 |