K-BaF9 by Sumita
Standard
Rare
Environmentally Friendly
K-BaF9 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.35 to 2.00 µm with an nd of 1.64328 and a Vd of 47.8. It has medium thermal expansion (CTE of 6.6×10⁻⁶/K) and good chemical resistance.
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) | 6.6 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.2 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.02 \times 10^{-7} + 2(1.44 \times 10^{-8})\,\Delta T + 3(-1.41 \times 10^{-10})\,\Delta T^2 + \frac{4.98 \times 10^{-7} + 2(5.81 \times 10^{-10})\,\Delta T}{\lambda - 0.243}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 2 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| BAM9 | Ohara | 1.643279 | 47.850606 | |
| BAF9 | Hoya | 1.643278 | 47.941673 | |
| BAF9 | Schott | 1.643276 | 47.958224 | |
| ZBAF2 | CDGM | 1.639616 | 48.230454 | |
| C48-46 | Corning | 1.647747 | 46.227993 | |
| CALCITE | Generic IR | 1.658643 | 48.541403 | |
| CALCITE | Generic Birefringent | 1.658643 | 48.541403 | |
| BAM8 | Ohara | 1.62374 | 47.09722 | |
| C24-47 | Corning | 1.624 | 46.940278 | |
| BAF8 | Hoya | 1.623739 | 47.054197 |