K-BaFn1 by Sumita
Standard
Rare
Environmentally Friendly
K-BaFn1 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.6825 and a Vd of 44.5. It has medium thermal expansion (CTE of 7.3×10⁻⁶/K) and average chemical resistance.
Refractive Index vs Wavelength
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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) | 7.3 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.4 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-8.23 \times 10^{-7} + 2(1.72 \times 10^{-8})\,\Delta T + 3(-1.68 \times 10^{-10})\,\Delta T^2 + \frac{5.4 \times 10^{-7} + 2(8.98 \times 10^{-10})\,\Delta T}{\lambda - 0.251}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| BAF50 | Schott | 1.682726 | 44.503507 | |
| ZBAF51 | CDGM | 1.682726 | 44.528543 | |
| BAF22 | Hoya | 1.682496 | 44.671672 | |
| IRG11 | Generic IR | 1.680932 | 44.434326 | |
| BAF20 | Hoya | 1.685777 | 43.901833 | |
| ADF8 | Hoya | 1.686498 | 42.863902 | |
| BAF13 | Hoya | 1.668916 | 44.911265 | |
| BAF13 | Schott | 1.668919 | 44.961828 | |
| BAH13 | Ohara | 1.668921 | 44.987354 | |
| BAH54 | Ohara | 1.695 | 42.167111 |