Realization of high-fidelity higher-order Bessel beams

Abstract

It is known that the Bessel beams are the solution to the Helmholtz equation, whose amplitude distributions should be strictly conformed with the Bessel functions of the first kind. In addition, the higher-order Bessel beams have helical phases of the same-order topological charges. However, the common methods can only generate approximate higher-order Bessel beams whose diffraction-free distances are shortened. In this paper, we introduce the concept of the high-fidelity higher-order Bessel beam (HHBB), a generated beam whose complex amplitude distribution is highly consistent with the theoretical expression of the corresponding higher-order Bessel beam. The generated HHBBs have the advantages of more compatible complex amplitude distributions with the corresponding theoretical expressions and enhanced diffraction-free distances which have potential applications in optical manipulation, laser processing, and high-resolution optical imaging.