A Didymium Glass Filter is a specialized optical filter containing a mixture of neodymium and praseodymium oxides, known for creating distinct absorption peaks in the visible spectrum, making it ideal for calibrating and verifying the wavelength accuracy of UV-Vis spectrophotometers in laboratories and research settings.It is used To test wavelength accuracy in Vis Range.

The didymium glass filter produces characteristic peaks that make it suitable for use as a wavelength reference material in the visible region of the spectrum.

Approximate peak wavelength values (in nm) are:
431, 473, 513, 529, 573, 585, 685, 741, 749, 807, 879.

The spectrum shows 11 characteristic and from 430 nm to 890 nm. well-defined peaks covering the wavelength range