HoDi liquid filter (241 - 864 nm)

for checking the wavelength accuracy

The HoDi liquid filter consists of a solution of holmium and didymium (praseodymium and neodymium) in perchloric acid. This filter features an especially broad wavelength spectrum and is therefore ideally suited to checking the wavelength accuracy of spectrophotometers in the UV and visible range. It has a broad spectrum with a variety of characteristic, very well-defined peaks in the range between 241 nm and 864 nm. Depending on the performance of the spectrophotometers used, up to 22 peaks can be detected at a slit width of 1 nm.


Typical spectrum of a HoDi filter, measured at a slit width of 1 nm.


ARTICLE-NO. 667045    Request this article
APPLICATION Checking the wavelength accuracy in the UV and Vis range
CONTENT Holmium and Didymium in perchloric acid
STANDARD CERTIFICATION Wavelengths: 241, 354, 444, 575, 641, 740, 864 nm
Slit width: 1 nm; with DAkkS calibration certificate
POSSIBLE CERTIFICATION Wavelengths: 241, 278, 287, 333, 347, 354, 361, 416, 444, 451, 468, 482, 512, 522, 537, 575, 641, 732, 740, 794, 800, 864 nm
Slit width: all up to 2 nm


Reference Materials (Brochure & User Manual EN)



Hellma USA Inc.
80 Skyline Drive
11803 Plainview, NY
United States

Phone: +1 516 939 0888


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