FD2 by Hoya
Obsolete
Unknown
Environmentally Dangerous
FD2 by Hoya is an obsolete optical glass. It transmits from 0.33 to 1.55 µm with an nd of 1.647693 and a Vd of 33.836872. It has medium thermal expansion (CTE of 8.6×10⁻⁶/K), good chemical resistance, and dangerous environmental properties.
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) | 1.647693 |
|---|---|
| Abbe Number (Vd) | 33.836872 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.25 — 1.55 µm |
$$n(\lambda) = \sqrt{2.63562 - 0.00883964\,\lambda^2 + 0.0256448\,\lambda^{-2} + 0.000965224\,\lambda^{-4} - 1.83048 \times 10^{-5}\,\lambda^{-6} + 5.55635 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.6 |
|---|---|
| TCE 100/300°C (10-6/K) | 96.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[4.39356 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 1 |
| Acid Resistance | 2 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| ZF1 | CDGM | 1.647693 | 33.836872 | |
| H-ZF1 | CDGM | 1.64769 | 33.840317 | |
| SF2 | Schott | 1.64769 | 33.85 | |
| N-SF2 | Schott | 1.64769 | 33.82 | |
| PBM22 | Ohara | 1.647689 | 33.802937 | |
| S-TIM22 | Ohara | 1.647689 | 33.792803 | |
| H-ZF1A | CDGM | 1.64769 | 33.887993 | |
| SF2 | Sumita | 1.64769 | 33.9 | |
| SF12 | Schott | 1.64831 | 33.841187 | |
| SF12 | Sumita | 1.64831 | 33.8 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| E-FD2 | Hoya | 1.64769 | 33.84 | |
| FD12 | Hoya | 1.648308 | 33.793909 | |
| FD9 | Hoya | 1.654462 | 33.717017 | |
| FD7 | Hoya | 1.639803 | 34.568909 | |
| E-FD7 | Hoya | 1.6398 | 34.57 | |
| F6 | Hoya | 1.636356 | 35.340304 | |
| FD19 | Hoya | 1.666797 | 33.059707 | |
| BAFD2 | Hoya | 1.664457 | 35.887705 | |
| F7 | Hoya | 1.625363 | 35.583498 | |
| E-F1 | Hoya | 1.62588 | 35.74 |