FD7 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
Transmission Calculator
Optical Properties
| Refractive Index (nd) | 1.639803 |
|---|---|
| Abbe Number (Vd) | 34.568909 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.25 — 1.55 µm |
$$n(\lambda) = \sqrt{2.61455 - 0.00986067\,\lambda^2 + 0.0236051\,\lambda^{-2} + 0.00122561\,\lambda^{-4} - 5.41556 \times 10^{-5}\,\lambda^{-6} + 6.63849 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.5 |
|---|---|
| TCE 100/300°C (10-6/K) | 91.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.47494 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.79 |
|---|---|
| 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 | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| SF7 | Sumita | 1.6398 | 34.6 | |
| PBM27 | Ohara | 1.639799 | 34.477127 | |
| S-TIM27 | Ohara | 1.639799 | 34.466422 | |
| H-F51 | CDGM | 1.6398 | 34.46457 | |
| C37-35 | Corning | 1.636493 | 35.322642 | |
| F6 | Schott | 1.636359 | 35.341176 | |
| PBM6 | Ohara | 1.636358 | 35.376536 | |
| F7 | CDGM | 1.636365 | 35.386204 | |
| S-TIM6 | Ohara | 1.636358 | 35.391923 | |
| F6 | Sumita | 1.63636 | 35.4 |