FD15 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) | 1.698945 |
|---|---|
| Abbe Number (Vd) | 30.050548 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.25 — 1.55 µm |
$$n(\lambda) = \sqrt{2.79363 - 0.0123435\,\lambda^2 + 0.0272631\,\lambda^{-2} + 0.0026133\,\lambda^{-4} - 0.000215138\,\lambda^{-6} + 1.95551 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 85.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.08372 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.17 |
|---|---|
| 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 | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| H-ZF11 | CDGM | 1.69894 | 30.05045 | |
| ZF11 | CDGM | 1.698949 | 30.065686 | |
| SF15 | Schott | 1.69895 | 30.07 | |
| SF15 | Sumita | 1.69895 | 30.0 | |
| C99-30 | Corning | 1.699002 | 30.107427 | |
| PBM35 | Ohara | 1.698947 | 30.121211 | |
| S-TIM35 | Ohara | 1.698947 | 30.127865 | |
| N-SF15 | Schott | 1.69892 | 30.2 | |
| L-TIM28P | Ohara | 1.694529 | 30.655992 | |
| S-TIH20 | Ohara | 1.70585 | 30.244176 |