Phase singularities and spectral switches of focused higher-order Bessel-Gauss pulsed beams

Author： Ding Chaoliang Lu Baida Pan Liuzhan

ISSN： 1362-3044

Source： Journal of Modern Optics, Vol.56, Iss.7, 2009-04, pp. : 863-874

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

The phase singularities and spectral switches of focused higher-order Bessel-Gauss pulsed beams are studied. Numerical calculation results are given to illustrate the dependence of phase singularities and spectral switches of focused higher-order Bessel-Gauss pulsed beams on the truncation parameter, topological charge, spatial parameter and propagation distance. It is shown that there always exists an optical vortex at the center of focused higher-order Bessel-Gauss pulsed beams and the topological charge is conserved during the propagation. The spectral switch appears in the neighborhood of the zero- or minimum-intensity position. With increasing topological charge or spatial parameter, the size of the vortex core increases and the spectral transition height decreases.