Abstract

Based on the angular spectrum representation and the method of stationary phase, an analytically asymptotic expression of the far field of a controllable dark-hollow beam (CDHB) diffracted by a circular aperture is derived. The normalized intensity distributions of an apertured CDHB in the far field are numerically demonstrated. The influence of the f-parameter on the non-paraxiality of the far field of an apertured CDHB is the largest, and the effect of the truncation parameter δ on the non-paraxiality of the far field is the smallest. The difference between the non-paraxial and the paraxial results is independent of the beam order N. The far field pattern of apertured CDHBs sometimes is only a central bright spot. Under certain conditions, a weakly brightly outer ring around the central bright spot is detected in the far field pattern.

© 2010 Optical Society of America

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