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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.

E_Holmium_Oxid_Flüssigfilter F7 Typical spectrum of a Didymium 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.

ApplicationAssessment of wavelength accuracy in both UV- and visigble range
ContentDidymium glass filter in metal frame
Standard certificationWavelength: 329; 472; 512; 681; 875 nm
Slit width: 1 nm
with DAkkS calibration certificate
Possible certificationsFurther wavelengths: 291; 302; 430; 446; 482; 626 nm
Slit width: all until 2 nm

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