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    Measuring spatio-temporal coupling in ultrashort optical pulses is key for applications. This study demonstrates a novel method using a multispectral camera and wavefront sensors to accurately quantify pulse-front tilt and radial group delay.

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    Area of Science:

    • Optics and Photonics
    • Ultrafast Laser Science
    • Wavefront Sensing

    Background:

    • Spatio-temporal coupling in ultrashort optical pulses can negatively impact applications by increasing pulse duration and reducing intensity.
    • Accurate characterization of these effects is crucial for optimizing ultrashort pulse applications.

    Purpose of the Study:

    • To demonstrate a method for spectrally resolved spatial-phase measurements of broadband ultrashort optical fields.
    • To quantify common spatio-temporal distortions like pulse-front tilt and radial group delay.

    Main Methods:

    • Utilized a custom multispectral camera integrated with two distinct wavefront sensors.
    • Employed a multilateral spatial shearing interferometer and an apodized imaged Hartmann sensor for phase measurements.
    • Processed spatially and spectrally resolved phase data.

    Main Results:

    • Successfully demonstrated spectrally resolved spatial-phase measurements.
    • Quantified pulse-front tilt and radial group delay.
    • Experimental results showed good agreement with theoretical models.

    Conclusions:

    • The developed technique provides accurate characterization of spatio-temporal coupling in ultrashort pulses.
    • This method enables better control and optimization of ultrashort pulse applications.
    • The findings validate the effectiveness of the combined camera and wavefront sensor approach.