Abstract
To produce THz pseudo-Bessel beam with uniform axial intensity distribution within a desired range, an irregular binary axicon (IBA) is proposed and designed in the authors' paper. Unlike a regular binary axicon (RBA) having the same prism angle, the IBA consists of concentric prism-like grooves with the different prism angles. It can be obtained from the RBA by an optimisation design. Comparison results demonstrate that within a specified region the on-axis intensity distributions of the pseudo-Bessel beams generated by the designed IBAs are much smoother than those produced by the RBAs.
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