Dual autofocusing circular Airy beams with different initial launch angles

Abstract

Dual autofocusing circular Airy beams (CAB) are proposed by introducing two different initial launch angles into the phase of light fields. Appropriate values of two launch angle parameters are chosen to enhance dual focusing property and reduce the interference effect. The relation between this dual autofocusing property and corresponding parameters are investigated. Our theoretical results show that, launch angle and initial radius of this beam have much influence on dual focal positions; decaying parameter and angle range parameter could only influence the focal intensities or relative intensity. Finally, dual autofocusing CAB is generated and the dual focusing property is demonstrated in experiment.