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Related Experiment Videos

Higher-order suppression in diffraction-grating monochromators using thin films.

F M Quinn1, D Teehan, M MacDonald

  • 1CLRC-Daresbury Laboratory, Warrington WA4 4AD, England.

Journal of Synchrotron Radiation
|July 21, 2004
PubMed
Summary
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Thin filters effectively reduce higher-order light contamination in extreme ultraviolet (XUV) monochromators, a common issue with tuneable synchrotron radiation sources. This method enhances photon beam purity for various scientific applications.

Area of Science:

  • Photonics and Synchrotron Radiation Science
  • Materials Science for Optics
  • Spectroscopy

Background:

  • Synchrotron radiation sources offer tuneable photon beams, highly desirable for experiments.
  • A significant drawback is higher-order diffracted light contamination in the photon beam.
  • Extreme ultraviolet (XUV) monochromators are particularly susceptible to second- and third-order light between 10 and 200 eV.

Purpose of the Study:

  • To investigate the efficacy of thin transmission filters for reducing higher-order light in XUV monochromators.
  • To characterize the performance of these filters, including suppression efficiency, transmission, and ageing.
  • To assess the impact of oxide contamination on filter performance.

Main Methods:

  • Utilized thin filters made of elements with absorption edges in the 10-200 eV range.

Related Experiment Videos

  • Employed photoelectron spectroscopy to measure filter suppression efficiency, transmission, and ageing.
  • Compared experimental results with theoretical calculations.
  • Assessed the influence of oxide contamination on filter performance.

    • Main Results:

    • Thin filters demonstrated significant suppression of higher-order light in diffraction-grating monochromators.
    • Filter performance metrics (efficiency, transmission, ageing) were characterized and validated against calculations.
    • Oxide contamination was found to affect filter performance, highlighting the need for clean filter preparation.
    • The filters have been successfully implemented and used routinely on eight XUV beamlines for several years.

    Conclusions:

    • Thin transmission filters are a practical and effective solution for mitigating higher-order light contamination in XUV monochromators.
    • The characterized filters provide a reliable method to improve photon beam quality from synchrotron sources.
    • Long-term routine use on multiple beamlines confirms the robustness and utility of this filtering technique.