Nonparaxial Focusing of Partially Coherent Gaussian Schell-Model and Bessel-Correlated Beams in Free Space

The nonparaxial focusing of partially coherent beams in free space has been studied using the coherent-state and coherent-mode decomposition methods. Analytical expressions for the width and angular divergence of partially coherent Gaussian Schell-model (GSM) beams have been obtained using the coher...

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Bibliographic Details
Published in:Photonics 2023-07, Vol.10 (7), p.857
Main Author: Petrov, Nikolai I.
Format: Article
Language:English
Subjects:
angular divergence
Bessel-correlated beams
Coherence
coherent-state method
Correlation
Electron beams
focus plane shift
Gaussian beams (optics)
Mathematical analysis
Methods
nonparaxial focusing
partially coherent beams
Propagation
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Summary:The nonparaxial focusing of partially coherent beams in free space has been studied using the coherent-state and coherent-mode decomposition methods. Analytical expressions for the width and angular divergence of partially coherent Gaussian Schell-model (GSM) beams have been obtained using the coherent-state method. It has been shown that the focusing plane is shifted in the opposite axial direction compared to the geometric focusing plane. The influence of the nonparaxiality and spatial coherence of Bessel-correlated vortex beams on the intensity distribution and displacement of the focus plane has been analyzed. It has been shown that the shift of the focus plane increases with a decrease in the coherence radius of the source. A smaller diffraction spread has been shown for partially coherent Bessel-correlated beams compared to GSM beams.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics10070857