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    This study addresses spectral distortion in Broadband Coherent Anti-Stokes Raman Scattering (BCARS) spectroscopy for crystalline materials. We assessed reproducibility and optimized setup parameters for accurate non-resonant background correction and spectral analysis.

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    Area of Science:

    • Spectroscopy
    • Materials Science
    • Crystallography

    Background:

    • Broadband Coherent Anti-Stokes Raman Scattering (BCARS) is a sensitive spectroscopy technique for imaging heterogeneous samples.
    • Non-resonant background (NRB) causes spectral distortion in BCARS, limiting its application in crystalline materials.
    • Reproducibility and optimization of BCARS setups are crucial for reliable solid-state analysis.

    Purpose of the Study:

    • To assess the reproducibility of BCARS measurements across different experimental setups.
    • To evaluate non-resonant background (NRB) correction procedures for crystalline materials.
    • To identify key BCARS setup parameters influencing spectral quality and provide optimization guidelines.

    Main Methods:

    • A round robin experiment was conducted using two distinct BCARS setups.
    • Crystalline materials (diamond, 6H-SiC, KDP, KTP) with varying complexity were analyzed.
    • Setup-specific NRB correction, spectral analysis, and mode assignment were compared.

    Main Results:

    • Identified setup-dependent spectral distortions due to non-resonant background (NRB).
    • Evaluated the effectiveness of different NRB correction strategies.
    • Determined the influence of pump wavelength, pulse width, and detection geometry on BCARS spectra.

    Conclusions:

    • BCARS reproducibility is influenced by setup parameters and NRB correction methods.
    • Optimized BCARS setups are essential for accurate spectral analysis of crystalline solids.
    • This work provides a practical guide for enhancing BCARS performance in solid-state applications.