Holmium Oxide Glass Filter
| Description | Holmium oxide glass filter, solid filter, certified |
| Use | Assessment of wavelength accuracy in both the UV and visible range (279 nm to 638 nm) with a spectral bandwidth up to 2 nm |
| Material | Glass doped with holmium oxide |
666-F1 Holmiumoxidglass-Filter
The light yellow filter marked F1 is a glass doped with holmium oxide (Ho2O3). The chemical element holmium shows a series of small absorption peaks in UV and Vis range.
Typical spectrum of a holmium oxide glass filter
Because the exact positions of the holmium peaks vary slightly for each production batch (movement due to the glass matrix), the filters are calibrated individually.
| Type | Material | Thickness | Absorbance at nm |
| 666-F1 | Holmium Oxide Glass | 2,1 mm | 279, 361, 454, 536, 638 |