Transmission Analysis of Off-Axis High Order Bessel-Gaussian Vortex Beam

Abstract

Abstract: The off-axis transmission of high order Bessel-Gaussian vortex beam produced by spiral phase
plate (SPP) and axicon is studied, which can provide reference for the off-axis high order
Bessel-Gaussian beams’ formation, intensity distribution control, spot location and other
practical applications. On the basis of the theory of diffraction, the transmission of the
higher order off-axis Bessel-Gaussian beams is simulated and analyzed by using the triple
fast Fourier transform (T-FFT) algorithm. The effects of dislocation parameters, topological
charge numbers and transmission distances of SPP and the axicon on the
beams are considered during the simulation. The analysis shows that the off-axis higher-order
Bessel-Gaussian beams have an uneven light intensity distribution. Due to the shift of the axicon,
the beams will be shifted as a whole and the uneven distribution of light intensity at different
distances is different. Different topological charge only affects the light spot expansion.
Various combinations of the off-axis parametric values for SPP and the axicon will generate
different light intensity distributions and even dark core's shifts.

Key words: vortex beam, distribution of field density, spiral phase plate, topological charge number

CLC Number:

O436.1

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