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Object alignment in spatially multiplexed holograms applied to polarization sensing.

Filip Krajinić1,2, Petar Atanasijević1, Peđa Mihailović1

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A new algorithm precisely aligns objects in digital holography using multiple reference waves. This method enhances polarization sensing accuracy, offering broad applicability for various holographic measurements.

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Area of Science:

  • Optics and Photonics
  • Holography
  • Polarization Sensing

Background:

  • Digital holography commonly uses a single reference wave for object reconstruction.
  • Multiple reference waves offer potential for advanced sensing but pose alignment challenges.
  • Accurate object alignment is crucial for quantitative analysis in digital holography.

Purpose of the Study:

  • To develop and validate a novel algorithm for precise object alignment in digital holography employing multiple spherical reference waves.
  • To apply this algorithm to polarization sensing using orthogonally polarized reference waves.
  • To demonstrate the algorithm's versatility for diverse digital holographic applications.

Main Methods:

  • A new algorithm was designed for object alignment in multi-reference-wave digital holography.
  • A simplified, adjustable holographic setup was engineered using a diffraction grating to produce two symmetric reference waves.
  • The algorithm's performance was evaluated using polarization sensing with two orthogonally polarized reference waves.

Main Results:

  • The algorithm achieved high accuracy in object alignment for polarization sensing.
  • Mean absolute errors of 0.71° (intensity) and 2.96° (phase) were obtained for polarizing element rotation angles.
  • The developed holographic setup was simple, adjustable, and effective in generating the required reference waves.

Conclusions:

  • The presented algorithm offers robust and accurate object alignment in digital holography with multiple spherical reference waves.
  • This technique significantly improves polarization sensing capabilities.
  • The algorithm's general applicability extends to any digital holographic measurement utilizing multiple spherical reference waves.