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  • Combined Holmium/Neutral Density glass

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Starna Scientific Ltd.
52/54 Fowler Road
Hainault, Essex
IG6 3UT
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Last updated 6 June 2018

 

Technique


  • UV-Visible Spectroscopy
  • Visible Spectroscopy
  • Fluorescence Spectroscopy
  • NIR Spectroscopy
  • Raman Spectroscopy
  • Life Sciences
  • Microplate References
  • HPLC

UV-VIS References


  • Instrument Qualification Kits
  • Absorbance
    • Potassium Dichromate (235-430 nm)
    • Nicotinic Acid (210-260 nm)
    • Neutral Density Filters (440-635nm)
    • Metal-on-Quartz Neutral Density Filters (250-635 nm)
    • Starna Green (Broadband SBW instruments) (250-650 nm)
    • Deep UV Reference (190-220 nm)
    • Combined Holmium/Neutral Density glass
    • Combined Didymium/Neutral Density glass
  • Wavelength
    • Holmium Oxide Liquid (240-650 nm)
    • Cerium Oxide Solution (200-300 nm)
    • Didymium Oxide Liquid (290-870 nm)
    • Combined Holmium/Didymium Solution
    • Holmium Oxide Glass (240-640 nm)
    • Didymium Glass Filter (430 nm to 890 nm)
    • Starna wide-range wavelength reference (335 – 1945 nm)
    • Starna Green (Broadband SBW instruments) (250-650 nm)
    • Deep UV Reference (190-220 nm)
    • Samarium Oxide Liquid (230-560 nm)
    • Combined Holmium/Neutral Density glass
    • Combined Didymium/Neutral Density glass
  • Stray Light
    • Specified Wavelength Method
    • Filter Ratio (Meilenz) Method
    • Stray Light Glasses
  • Resolution/Bandwith
    • Toluene in Hexane (265-270 nm)
    • Toluene in Methanol (Derivative Spectroscopy) (265-270 nm)
    • Benzene Vapour (230-270 nm)

Visible References


  • Absorbance
    • Neutral Density Filters
    • Metal-on-Quartz Neutral Density Filters (250-635 nm)
    • Starna Green (Broadband SBW instruments) (250-650 nm)
    • Combined Holmium/Neutral Density glass (360 - 640 nm)
    • Combined Didymium/Neutral Density glass (430 - 890 nm)
  • Wavelength
    • Holmium Oxide Liquid (240-650 nm)
    • Didymium Oxide Liquid (290-870 nm)
    • Holmium Oxide Glass (270-640 nm)
    • Didymium Glass (430 nm to 890 nm)
    • Combined Holmium/Neutral Density glass (360 - 640 nm)
    • Combined Didymium/Neutral Density glass (430 - 890 nm)
    • Starna Green (Broadband SBW instruments) (250-650 nm)
    • Samarium Oxide Liquid (230-560 nm)

Combined Holmium Oxide/Neutral Density Filter

Purpose

Purpose

This filter is a useful tool for routinely checking the wavelength and absorbance accuracy of a visible spectrophotometer. Like its liquid counterpart, the holmium glass filter produces characteristic peaks that make it suitable for use as a wavelength reference material in the visible region of the spectrum. In this filter, the holmium glass is optically bonded a neutral density filter giving a nominal 1A background absorbance that can be used to check the absorbance accuracy of the instrument

 

Description and Discussion

Description and Discussion

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, so each Starna filter is individually certified.

7 characteristic and well-defined peaks can be certified, covering the wavelength range from 360 nm to 640 nm. This spectrum is superimposed on a constant background absorbance, nominally 1A.

 

Typical spectra

Typical spectra

Combination-Holmium-absorbance

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.

Note: The above values are for guidance only. TheCalibration Certificate accompanying each Starna Glass Reference gives actual values measured at a bandwidth of 1 nm and only these certified values should be used for instrument qualification. On request, Starna can provide certified values at other wavelengths and bandwidthvalues.

 

 
Catalogue Number

Catalogue Number

  Catalogue  Number

Holmium /Neutral Density glass filter

RM-HG/1ND

 

Product enquiry

Product enquiry

 

Data sheet

Data sheet

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