The didymium glass filter 666-F7W is made from material specially manufactured by Schott AG. Like holmium glass, didymium glass has a variety of characteristic peaks in the ultraviolet and visible range and is typically used for checking wavelength accuracy. Its peaks are not as narrow as those of holmium glass filters. The filter’s absorbance behavior in the ultraviolet range (270 - 342 nm) also makes it suitable as an absorbance filter for checking photometric accuracy (see 666-F7A, Didymium glass filter).
Typical spectrum of a Didymium glass filters, measured with a slit width of 1 nm.
|ARTICLE-NO.||666F7W-323 oder 666F7-323 Request one of these articles|
|APPLICATION||Checking the wavelength accuracy in the UV and Vis range|
|CONTENT||Didymium glass with metal frame|
|STANDARD CERTIFICATION||Wavelengths: 329, 472, 512, 681, 875 nm |
Slit width: 1 nm; with DAkkS calibration certificate
|POSSIBLE CERTIFICATION||Wavelengths: 302, 329, 430, 472, 482, 512, 681, 875 nm |
Slit width: all up to 2 nm
The positions of didymium glass peaks may vary slightly depending on the glass batch used. This is why Hellma Analytics certifies each didymium glass filter individually.