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<p>We present an experimental scheme for the measurement of the cross–correlation function in optical beams. Our approach involves illuminating a Spatial Light Modulator by an extended thermal source (generation) and a Sagnac–based wavefront folding interferometer (characterization). We emphasize the use of a common–path interferometer due to its easy assembly and high stability features, factors that make this apparatus relevant for practical applications. As illustrative examples, we explore Laguerre–Gauss and Hermite–Gauss modes, highlighting that in the partially coherent regime, their intensity distributions are blurred while retaining essential information in their cross-correlation function.</p>

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A Sagnac wavefront folding interferometer for characterizing partially coherent structured light

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Carlos Cardoso-Isidoro,
  • Adad Yepiz-Escalante,
  • Raul I. Hernandez-Aranda,
  • Benjamin Perez-Garcia

摘要

We present an experimental scheme for the measurement of the cross–correlation function in optical beams. Our approach involves illuminating a Spatial Light Modulator by an extended thermal source (generation) and a Sagnac–based wavefront folding interferometer (characterization). We emphasize the use of a common–path interferometer due to its easy assembly and high stability features, factors that make this apparatus relevant for practical applications. As illustrative examples, we explore Laguerre–Gauss and Hermite–Gauss modes, highlighting that in the partially coherent regime, their intensity distributions are blurred while retaining essential information in their cross-correlation function.