TAFD34 by Hoya
Preferred
Very Common
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) | 1.85033 |
|---|---|
| Abbe Number (Vd) | 42.7 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{3.32899 - 0.0132648\,\lambda^2 + 0.0319952\,\lambda^{-2} + 0.000781003\,\lambda^{-4} - 3.35087 \times 10^{-6}\,\lambda^{-6} + 2.13522 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.6 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.2 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.02 \times 10^{-6} + 2(8.77 \times 10^{-9})\,\Delta T + 3(-8.69 \times 10^{-11})\,\Delta T^2 + \frac{6.38 \times 10^{-7} + 2(3.66 \times 10^{-10})\,\Delta T}{\lambda - 0.233}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.94 |
|---|---|
| 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 | 3 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Recommended glass type
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| K-VC99 | Sumita | 1.8506 | 41.6 | |
| K-VC99(M) | Sumita | 1.84604 | 41.5 | |
| S-LAH89 | Ohara | 1.8515 | 40.782269 | |
| LASFN13 | Sumita | 1.863 | 41.6 | |
| K-LaSFn8 | Sumita | 1.835 | 42.7 | |
| LASFN8 | Sumita | 1.835 | 42.7 | |
| K-LaSFn8W | Sumita | 1.8349 | 42.7 | |
| H-ZLAF55C | CDGM | 1.83481 | 42.711575 | |
| H-ZLAF55D | CDGM | 1.83481 | 42.725177 | |
| S-LAH55 | Ohara | 1.834807 | 42.713673 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| TAFD6 | Hoya | 1.847498 | 43.033415 | |
| TAFD5 | Hoya | 1.835 | 42.984244 | |
| TAFD5F | Hoya | 1.83481 | 42.72 | |
| TAFD5G | Hoya | 1.83481 | 42.72 | |
| M-TAFD305 | Hoya | 1.85135 | 40.1 | |
| MP-TAFD305 | Hoya | 1.85135 | 40.1 | |
| MC-TAFD305 | Hoya | 1.85135 | 40.1 | |
| MC-TAFD315 | Hoya | 1.85135 | 40.07 | |
| M-TAFD315 | Hoya | 1.85135 | 40.07 | |
| TAFD32 | Hoya | 1.8707 | 40.73 |