FDS20-W by Hoya
Preferred
Very Common
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) | 1.86966 |
|---|---|
| Abbe Number (Vd) | 20.02 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{3.31147 - 0.0194024\,\lambda^2 + 0.0516218\,\lambda^{-2} + 0.0058556\,\lambda^{-4} - 0.000532873\,\lambda^{-6} + 7.31978 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.0 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-5.56 \times 10^{-6} + 2(1.23 \times 10^{-8})\,\Delta T + 3(-5.99 \times 10^{-11})\,\Delta T^2 + \frac{1.06 \times 10^{-6} + 2(1.34 \times 10^{-9})\,\Delta T}{\lambda - 0.321}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.37 |
|---|---|
| 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 | — |
Notes
Recommended glass type
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| S-NPH5 | Ohara | 1.858955 | 22.728736 | |
| S-NPH4 | Ohara | 1.89286 | 20.36181 | |
| K-PSFn190(M) | Sumita | 1.89816 | 21.7 | |
| K-PSFn1(M) | Sumita | 1.89945 | 21.3 | |
| SFL57 | Schott | 1.84666 | 23.62 | |
| PBH55 | Ohara | 1.84986 | 24.054274 | |
| L-TIH53 | Ohara | 1.84666 | 23.773536 | |
| S-TIH53 | Ohara | 1.84666 | 23.77794 | |
| S-TIH53W | Ohara | 1.84666 | 23.77794 | |
| SF57HHT | Schott | 1.84666 | 23.779912 |