The holmium glass filter 666-F1 has a range of narrow, well defined peaks in the UV and visible range, making holmium an excellent choice for checking the wavelength scale of spectrophotometers. In comparison to filters that use holmium solution (Holmium liquid filter), the holmium glass filter has a weaker spectrum with fewer peaks. In the low UV range the absorbance behavior of the glass matrix is superimposed on the holmium peaks. The main advantage of using a glass filter over a liquid filter is that it is more robust.
Typical spectrum of a holmium glass filter, measured with a slit width of 1 nm.
|ARTICLE-NO.||666F1-339 Request this article|
|APPLICATION||Checking the wavelength accuracy in the UV and Vis range|
|CONTENT||Holmium glass with metal frame|
|STANDARD CERTIFICATION||Wavelengths: 279, 361, 453, 536, 638 nm |
Slit width: 1 nm; with DAkkS calibration certificate
|POSSIBLE CERTIFICATION||Wavelengths: 279, 287, 361, 418, 445, 453, 460, 536, 638 nm |
Slit width: all up to 2 nm
The positions of holmium peaks may vary slightly depending on the glass batch used. This is why Hellma Analytics certifies each holmium glass filter individually.