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Updated: Jul 6, 2025

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Evolution of coherence singularities in polarization singular beams
Applied Optics
|January 4, 2024
Summary
Partially coherent polarization singular beams (PC-PSBs) exhibit correlation singularities influenced by vortex beam topological charge and coherence length. The number of ring dislocations in spectral degree of coherence (SDoC) reveals beam properties for applications like free-space communication.
Area of Science:
- Optics and Photonics
- Quantum Information Science
- Beam Physics
Background:
- Partially coherent polarization singular beams (PC-PSBs) are formed by superposing two orthogonally polarized vortex beams.
- Understanding coherence singularities in PC-PSBs is crucial for controlling beam properties.
- Topological charge and spatial coherence length are key parameters influencing PC-PSBs.
Purpose of the Study:
- To investigate the evolution of correlation singularities in PC-PSBs.
- To establish the relationship between beam parameters and coherence singularity formation.
- To explore the potential of SDoC profiles for determining PC-PSB polarity.
Main Methods:
- Theoretical analysis of PC-PSBs as superpositions of vortex beams.
- Calculation and analysis of the spectral degree of coherence (SDoC) profiles.
- Examination of the modulus and phase of the SDoC to identify singularities and polarity.
Main Results:
- Coherence singularities manifest as ring dislocations in the SDoC modulus.
- The number of ring dislocations directly corresponds to the higher topological charge of the component vortex beams.
- The SDoC phase profile provides a method for determining the polarity of PC-PSBs.
Conclusions:
- The topological charge and spatial coherence length critically govern coherence singularity evolution in PC-PSBs.
- SDoC analysis offers a robust method for characterizing PC-PSBs, including their polarity.
- These findings have implications for applications requiring precise control of beam coherence and polarization, such as free-space optical communication and advanced imaging techniques.
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