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Updated: Jun 12, 2026

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High rejection ruby filter for laser light scattering experiments.

C Gowers, K Hirsch, P Nielsen

    Applied Optics
    |June 12, 2010
    PubMed
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    A novel ruby crystal filter effectively blocks stray laser light in scattering experiments. This filter enhances Raman calibration for lidar Thomson scattering systems, improving experimental accuracy.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Plasma Physics

    Background:

    • Stray laser light can interfere with scattering experiments, compromising data quality.
    • Accurate calibration of diagnostic systems, such as lidar Thomson scattering, is crucial for fusion energy research.

    Purpose of the Study:

    • To develop and characterize a rejection filter for stray ruby laser light.
    • To assess the filter's effectiveness in improving Raman calibration for lidar Thomson scattering systems.

    Main Methods:

    • Fabrication of a filter using an array of sixty-four ruby crystal cubes (5 x 5 x 15 mm³).
    • Doping the ruby crystals with up to 2.3 wt. % chromium oxide.
    • Measuring suppression factors of individual cubes and the assembled array.

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    Last Updated: Jun 12, 2026

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    Main Results:

    • Individual ruby crystal cubes achieved suppression factors exceeding 10⁶.
    • The assembled filter array demonstrated an effective overall suppression factor of 10⁴.
    • The filter successfully facilitated Raman calibration of the JET tokamak's lidar Thomson scattering system.

    Conclusions:

    • The developed ruby crystal filter is highly effective at rejecting stray ruby laser light.
    • This filter significantly improves the Raman calibration of lidar Thomson scattering systems.
    • The technology is applicable to enhancing diagnostic capabilities in fusion research.