Lommel beams have significant applications in optical communication and optical manipulation due to the changeable symmetry of transverse intensity distribution and constantly varying orbital angular momentum. In this paper, a novel quasi-diffraction-free Lommel-Airy vortex (LAiV) wavepackets is proposed, and spatiotemporal dynamics of the LAiV wavepackets propagating in chiral media are investigated. Results indicate that several variables such as topological charge , group velocity , asymmetry factor , and chiral parameter could be used to regulate the profiles of the 3D spatiotemporal vortex rings. Particularly, the spatiotemporal propagation trajectories and intensity patterns of the LAiV wavepackets could be manipulated by altering the asymmetry factor and the chiral parameter . These results would deepen the understanding of the spatiotemporal propagation properties of the LAiV wavepackets and are expected to promote the development of the novel optical communications in chiral media.
Model transformation from a hollow Gaussian beam (HGB) to an Airy Gaussian beam (AGB) was investigated based on the optical Airy transformation method. The HGB was transformed into a superposition of finite Airy beam via an optical Airy transformation system (OATS). Analytical expression of the AGB was deduced and used to demonstrate the produced AGB’s characteristics. Results showed that the intensity distribution and the number of side lobes of the AGB were determined by the control parameters α and β of the OATS, and the order n of the incident beam. In addition, a hollow Gaussian beam with a certain mode could be obtained by an incidence of an Airy Gaussian beam with a certain modulation parameter through the OATS. Results obtained here indicated that the model transformation between a Gaussian beam and an Airy beam could be realized by the optical Airy transformation method, which method would be valuable in generating of a novel kind of Airy beam and exploiting practical applications of the HGB.
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