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    We developed a new algorithm and experimental method, FALCON, to quickly and affordably measure complex laser pulse couplings. This technique quantifies spatio-temporal couplings, crucial for high-power laser applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • High-Power Laser Systems

    Background:

    • Accurate characterization of spatio-temporal couplings in high-power lasers is critical for precise intensity focusing.
    • Existing diagnostic methods for these couplings are often time-consuming or qualitative, limiting their practical application.

    Purpose of the Study:

    • To introduce a novel, efficient algorithm and experimental setup for quantitative measurement of spatio-temporal couplings.
    • To provide a cost-effective and easily implementable solution for laser diagnostics in existing facilities.

    Main Methods:

    • Developed a new algorithm based on expressing spatio-spectral phase using a Zernike-Taylor basis.
    • Implemented a novel experimental setup utilizing bandpass filters with a Shack-Hartmann wavefront sensor.
    • Abbreviated the technique as FALCON (Fast Acquisition of Laser Couplings using Narrowband filters).

    Main Results:

    • Successfully quantified coefficients for common spatio-temporal couplings.
    • Demonstrated the method's effectiveness in a quantitative measurement at the ATLAS-3000 petawatt laser facility.
    • Validated FALCON as a fast, simple, and inexpensive diagnostic tool.

    Conclusions:

    • The FALCON technique offers a significant advancement in the quantitative characterization of laser spatio-temporal couplings.
    • This method facilitates improved control and understanding of focused intensity in high-power laser systems.
    • FALCON is readily adaptable for implementation in various existing laser facilities.