Didymium

Part No.: 226-85009-02

Glass filter containing holmium oxide, mounted stressfree in an anodised aluminium holder. As a solid material the holmium glass filter is physically more robust than the equivalent liquid cell, and can therefore be used in more demanding environments, making it especially useful as a routine wavelength check. Sliding window covers are provided to protect the surface from damage when not in use. Variations from melt to melt of the glass can causesmall uncertainties in peak position Each filter is individually certified. Approximate peak wavelength values (in nm) are: 242, 279, 288, 334, 361, 419, 446, 454, 460, 537, 638   Material Part Number Wavelength range Usage Didymium 226-85009-01 430 nm to 890 nm For wavelength analysis Holmium Oxide 226-85009-02 240 nm to 640 nm For wavelength analysis Didymium Oxide/Neutral Density 226-85009-21 430 nm to 890 nm For wavelength and absorbance analysis Holmium Oxide/Neutral Density 226-85009-22 360 nm to 640 nm For wavelength and absorbance analysis  

Part No.: 226-85009-21

Glass filter containing didymium (a mixture of neodymium & praseodymium) oxide, optically bonded to a neutral density filter and mounted stress free in an anodised aluminium holder. Sliding window covers are provided to protect the surface from damage when not in use. Variations from melt to melt of the glass can cause small uncertainties in peak position. Each filter is individually certified. 9 peak wavelengths are certified at nominal values of 473, 514, 530, 572, 586, 739, 748, 807 and 879 nm. The absorbance values, nominally 1A, are certified at wavelengths between the didymium peaks, at 410, 455, 550, 637 and 773 nm.   Material Part Number Wavelength range Usage Didymium 226-85009-01 430 nm to 890 nm For wavelength analysis Holmium Oxide 226-85009-02 240 nm to 640 nm For wavelength analysis Didymium Oxide/Neutral Density 226-85009-21 430 nm to 890 nm For wavelength and absorbance analysis Holmium Oxide/Neutral Density 226-85009-22 360 nm to 640 nm For wavelength and absorbance analysis  

Part No.: 226-85009-22

Glass filter containing holmium oxide, bonded to a neutral density filter and mounted stress free in an anodised aluminium holder. Sliding window covers are provided to protect the surface from damage when not in use. Variations from melt to melt of the glass can cause small uncertainties in peak position. Each filter is individually certified. 7 peak wavelengths are certified at nominal values of 361, 419, 446, 454, 460, 537 and 638 nm. The absorbance values, nominally 1A, are certified at wavelengths between the holmium peaks, at 431, 516, 557, 594 and 623 nm.   Material Part Number Wavelength range Usage Didymium 226-85009-01 430 nm to 890 nm For wavelength analysis Holmium Oxide 226-85009-02 240 nm to 640 nm For wavelength analysis Didymium Oxide/Neutral Density 226-85009-21 430 nm to 890 nm For wavelength and absorbance analysis Holmium Oxide/Neutral Density 226-85009-22 360 nm to 640 nm For wavelength and absorbance analysis