FD1 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) | 1.71736 |
|---|---|
| Abbe Number (Vd) | 29.50028 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.25 — 1.55 µm |
$$n(\lambda) = \sqrt{2.85022 - 0.0122021\,\lambda^2 + 0.0295174\,\lambda^{-2} + 0.00246995\,\lambda^{-4} - 0.000165275\,\lambda^{-6} + 1.56969 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.9 |
|---|---|
| TCE 100/300°C (10-6/K) | 89.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[8.75071 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.46 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 0 |
| Acid Resistance | 2 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| K-SFLD1 | Sumita | 1.71736 | 29.5 | |
| SF1 | Sumita | 1.71736 | 29.5 | |
| H-ZF3 | CDGM | 1.71736 | 29.49911 | |
| SF1 | Schott | 1.71736 | 29.51 | |
| D17-29 | Corning | 1.717409 | 29.492751 | |
| ZF3 | CDGM | 1.717365 | 29.510385 | |
| PBH1 | Ohara | 1.717362 | 29.513538 | |
| S-TIH1 | Ohara | 1.717362 | 29.518091 | |
| N-SF1 | Schott | 1.71736 | 29.62 | |
| K-CD120(M) | Sumita | 1.71466 | 29.6 |