666-F1 Holmium Glass Filter
The holmium glass filter type 666-F1 shows a series of small, well defines peaks in the UV and Vis range. Due to this characteristic, holmium is well suited to check the wavelength scala of spectralphotometer. In contrary to the holmium liquid filter, the holmium glass filter has a bland spectrum with fewer peaks. Especially in the lower UV range the absortion properties of the glass matrix overlay the holmium peaks.
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.
|Application||Assessment of wavelength accuracy in both UV- and visible range|
|Content||Holmium glass filter in metal frame|
|Standard certification||Wavelength accuracy at: 279, 361, 453, 536, 638 nm|
Slit width: 1 nm
with DAkkS calibration certificate
|Possible certifications||Further wavelength: 287; 418; 445; 460 nm|
Slit width: all until 2 nm