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Evaluating the Beam Shape Coefficients of Bessel-Gauss Beams with Radial Quadrature: a comparison with Angular Spectrum Decomposition and Finite Series Methods
JOSA A- received 02/08/2024; accepted 04/27/2024; posted 04/29/2024; Doc. ID 520876
- Abstract: The Bessel-Gauss beam (BGB) stands as a physically realizable beam extensively employed in applications such asmicromanipulation and optical trapping. In these contexts, the assessment of beam shape coefficients (BSCs) becomes imperative.Previous researches reveal that the BSCs of the BGBs obtained with different methods deviate from each other under certaincircumstances. In this paper, the formulation of BSCs employs the radial quadrature (RQ) method and a comparative analysis isconducted with counterparts formulated using the angular spectrum decomposition (ASD) and the finite series (FS) technique.Contribution stemming from evanescent waves and the situation of the BSCs blowing-ups are discussed, offering a deep insight ofpertinent BSC evaluation methods. The paper provides alternative approach for calculating the BSCs of the BGBs.