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Related Experiment Video

Updated: Jun 24, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

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Published on: July 19, 2016

Evolution of singularities in a partially coherent vortex beam.

Thomas van Dijk¹, Taco D Visser

¹Department of Physics and Astronomy, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|April 3, 2009

Summary

Phase singularities in Laguerre-Gauss beams transform in propagation. Coherence singularities emerge in partially coherent beams, demonstrating a shift in beam characteristics.

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Area of Science:

Optics and Photonics
Laser Physics
Wave Phenomena

Background:

Laguerre-Gauss beams are fundamental solutions in paraxial optics.
Partial coherence affects the propagation and properties of light beams.
Singularities in optical fields, such as phase singularities, are critical features.

Purpose of the Study:

To investigate the evolution of phase and coherence singularities in a partially coherent Laguerre-Gauss beam.
To analyze the transformation of an on-axis intensity minimum (phase singularity) in the beam.
To observe the development of coherence singularities during beam propagation.

Main Methods:

Utilizing a spatial light modulator to induce partial coherence in a Laguerre-Gauss beam.
Analyzing the beam's characteristics in the far-field.
Employing numerical simulations to model the propagation and singularity evolution.

Main Results:

The on-axis phase singularity transforms into an intensity maximum in the far-field.
Coherence singularities, initially absent, develop as the beam propagates.
A clear transition from phase singularity dominance to coherence singularity emergence is observed.

Conclusions:

Partial coherence significantly alters the singularity structure of Laguerre-Gauss beams.
The study highlights the dynamic interplay between phase and coherence singularities.
This research provides insights into the behavior of structured light in complex media.