666-F7W Didymium glass filter
The didymium glass filter 666-F7 is made special manufactured materials by the company SCHOTT. Just like holmium glass, didymium glass as well shows a multitude of characteristic peaks in the UV and Vis range. Therefore, it is usually used to check the wavelength accuracy. However, the peaks are not as narrow-band as the one of the holmium glass filter.
Because the exact positions of the didymium 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 visigble range|
|Content||Didymium glass filter in metal frame|
|Standard certification||Wavelength: 329; 472; 512; 681; 875 nm|
Slit width: 1 nm
with DAkkS calibration certificate
|Possible certifications||Further wavelengths: 291; 302; 430; 446; 482; 626 nm|
Slit width: all until 2 nm