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Correlating laser damage tests.

J W Arenberg, M E Frink, D W Mordaunt

    Applied Optics
    |June 16, 2010
    PubMed
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    Laser damage test results correlate when optics share the same irradiance history. Different irradiance histories between laser damage tests generally do not show a correlation for coated optics.

    Area of Science:

    • Materials Science
    • Optical Engineering
    • Laser Physics

    Background:

    • Laser-induced damage to optical materials is a critical concern in high-power laser systems.
    • Standardized testing protocols are essential for reliable material selection and system design.
    • Existing laser damage test facilities may yield divergent results due to varying methodologies.

    Purpose of the Study:

    • To correlate laser damage test results from two independent commercial facilities.
    • To identify key test parameters influencing the reproducibility of laser damage test outcomes.
    • To establish the reliability of laser damage testing for coated optics.

    Main Methods:

    • Comparison of laser damage test data from Hughes Aircraft Co. and Montana Laser Optics.

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  • Testing a variety of coated laser optics under varied conditions.
  • Analysis of parameters including transverse modal content, spot size, pulse width, and sample conditioning history.
  • Statistical correlation analysis (linear fit) of damage levels between facilities.

    • Main Results:

    • A strong correlation in laser damage levels was observed when optics underwent the same irradiance conditioning history.
    • Modal content and pulse width variations did not significantly impact correlation under identical irradiance histories.
    • Laser damage test results generally did not correlate when samples had different irradiance conditioning histories.
    • The study highlights the critical role of irradiance history in test result reproducibility.

    Conclusions:

    • Laser damage test results are highly dependent on the specific irradiance history applied to the optics.
    • Standardization of sample conditioning history is crucial for inter-facility correlation of laser damage test data.
    • The findings provide a basis for improving the reliability and comparability of laser damage testing for optical components.