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Related Experiment Video

Updated: Jul 16, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

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Published on: October 11, 2016

High-visibility interferometric measurement of the diffraction phase.

Salvador Barraza-Lopez1, Daniel F V James, Paul G Kwiat

  • 1Department of Physics and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. salva@vt.edu

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|March 16, 2007
PubMed
Summary

Researchers precisely determined the absolute phase in Fresnel diffraction for Gaussian beams using a modified Sagnac interferometer. This stable setup erases path information, enabling accurate phase measurements with optimized interference visibility.

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Area of Science:

  • Optics and Photonics
  • Quantum Interferometry

Background:

  • Fresnel diffraction is crucial for understanding wave propagation.
  • Determining absolute phase in diffraction is challenging.
  • Gaussian beams are fundamental in laser physics.

Purpose of the Study:

  • To develop a method for obtaining the absolute phase in Fresnel diffraction for Gaussian beams.
  • To enhance phase determination precision using interferometry.
  • To create a stable and active-element-free optical setup.

Main Methods:

  • Utilized a modified polarization Sagnac interferometer.
  • Spatially separated and polarization-labeled counterpropagating paths.
  • Erased polarization 'which-path' information using an analyzing polarizer.
  • Controlled relative intensities of diffracted and reference beams.

Main Results:

  • Achieved precise determination of absolute phase in Fresnel diffraction.
  • Optimized interference visibility for accurate phase measurement.
  • Demonstrated a highly stable optical setup.
  • Eliminated the need for active stabilization elements.

Conclusions:

  • The modified polarization Sagnac interferometer provides a robust method for absolute phase determination in Fresnel diffraction.
  • The technique allows for precise control over interference parameters.
  • The setup's stability and lack of active elements make it practical for various applications.