FD1 by Hoya
Obsolete
Unknown
Environmentally Dangerous
FD1 by Hoya is an obsolete optical glass. It transmits from 0.34 to 1.55 µm with an nd of 1.71736 and a Vd of 29.50028. It has medium thermal expansion (CTE of 7.9×10⁻⁶/K), excellent 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
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) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[8.75071 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 0 |
| Acid Resistance | 2 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| 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 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| E-FD1L | Hoya | 1.71736 | 29.5 | |
| E-FD1 | Hoya | 1.71736 | 29.5 | |
| FD20 | Hoya | 1.720225 | 29.300359 | |
| FD18 | Hoya | 1.721507 | 29.243436 | |
| FDS2 | Hoya | 1.7283 | 28.674457 | |
| E-FD10L | Hoya | 1.72825 | 28.32 | |
| E-FD10 | Hoya | 1.72825 | 28.32 | |
| FD10 | Hoya | 1.728252 | 28.319563 | |
| E-FD15L | Hoya | 1.69895 | 30.05 | |
| E-FD15 | Hoya | 1.69895 | 30.05 |