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Axial multi-image phase retrieval reconstructs object wave fields but is hindered by tilted illumination. This study introduces cross-correlation calibration to correct for tilt, improving image reconstruction accuracy in optical systems.

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Area of Science:

  • Coherent diffractive imaging
  • Optical metrology

Background:

  • Axial multi-image phase retrieval reconstructs wave fields using axial movement diversity.
  • Experimental retrieval is degraded by lateral shifts in diffraction patterns caused by tilted illumination.
  • Tilted illumination leads to blurry or erroneous reconstructed images.

Purpose of the Study:

  • To address the limitations of axial multi-image phase retrieval caused by tilted illumination.
  • To develop a method for accurate wave field reconstruction in the presence of oblique incident light.
  • To provide guidance for measuring incident light obliquity in optical systems.

Main Methods:

  • Introduced cross-correlation calibration to determine the oblique angle of illumination.
  • Integrated tilt diffraction correction into the axial phase retrieval process.
  • Validated the method through both simulation and experimental setups.

Main Results:

  • Successfully recovered the target object wave field despite tilted illumination.
  • Demonstrated the effectiveness of the cross-correlation calibration and tilt diffraction method.
  • Achieved improved accuracy and clarity in reconstructed images compared to standard methods.

Conclusions:

  • The proposed method effectively corrects for tilted illumination in axial multi-image phase retrieval.
  • This technique enhances the accuracy and reliability of coherent diffractive imaging.
  • The approach offers a practical tool for assessing incident light obliquity in optical measurements.