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Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
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    We developed a method to measure the spectral sensitivity of high-power short-pulse lasers. This technique is crucial for understanding laser-target interactions and improving chirped pulse amplification systems.

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    Area of Science:

    • High-power laser physics
    • Nonlinear optics
    • Ultrafast science

    Background:

    • Characterizing temporal pulse evolution is vital for high-power short-pulse lasers.
    • Existing methods often lack spectral sensitivity across the full operational bandwidth.
    • Chirped pulse amplification (CPA) systems require precise pulse characterization for optimal performance.

    Purpose of the Study:

    • To extend scanning third-order correlator measurements to include spectral sensitivity.
    • To enable accurate pulse evolution diagnostics within the bandwidth of CPA systems.
    • To improve the interpretation of relativistic laser-target interactions.

    Main Methods:

    • Developed a method incorporating spectral sensitivity into temporal pulse evolution measurements.
    • Utilized angle tuning of a third harmonic generating crystal to achieve spectral response.
    • Modeled and experimentally validated the spectral response of the diagnostic system.

    Main Results:

    • Demonstrated spectral sensitivity for temporal pulse evolution measurements.
    • Successfully validated the modeling of spectral response via crystal angle tuning.
    • Obtained spectrally resolved pulse contrast measurements of a Petawatt laser frontend.

    Conclusions:

    • Full bandwidth coverage is essential for accurate interpretation of laser-target interactions.
    • The presented method enhances diagnostics for high-power short-pulse lasers, particularly CPA systems.
    • Improved understanding of spectrally resolved pulse contrast aids in studying relativistic effects on solid targets.