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Complex amplitude reconstruction for dynamic beam quality M2 factor measurement with self-referencing interferometer

Yongzhao Du, Yuqing Fu, Lixin Zheng

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    |January 7, 2017
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    Summary

    A novel method reconstructs laser beam complex amplitude in real-time for accurate dynamic beam quality M² factor determination. This technique simplifies laser characterization, even in challenging environments.

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    Area of Science:

    • Optical Metrology
    • Laser Beam Characterization
    • Wavefront Sensing

    Background:

    • Accurate determination of laser beam quality is crucial for various applications.
    • Existing methods for dynamic beam quality measurement can be complex and time-consuming.
    • Characterizing laser beams in real-time, especially under dynamic conditions, presents significant challenges.

    Purpose of the Study:

    • To develop a real-time complex amplitude reconstruction method for dynamic beam quality M² factor determination.
    • To enable full characterization of laser beams (amplitude and phase) from a single interference pattern.
    • To provide a simple, fast, and accurate method for laser beam analysis, particularly in inaccessible conditions.

    Main Methods:

    • Utilizing a Mach-Zehnder self-referencing interferometer wavefront sensor.
    • Employing a Fourier fringe pattern analysis for complex amplitude reconstruction from a single interference pattern (one-shot measurement).
    • Applying diffraction integral theory to propagate the reconstructed beam field and calculating the M² factor per Standard ISO11146.

    Main Results:

    • Successfully demonstrated a real-time complex amplitude reconstruction method.
    • Validated the method's feasibility through theoretical analysis and experiments on static and dynamic laser beams.
    • Achieved full laser beam characterization, including amplitude and phase, from a single measurement.

    Conclusions:

    • The proposed method offers a simple, fast, and accurate approach for real-time dynamic beam quality M² factor determination.
    • This technique eliminates the need for movable parts, allowing laser investigation in previously inaccessible conditions.
    • The developed method advances laser beam metrology by enabling efficient and comprehensive characterization.