Abstract
The conical beam consists of a set of separate beams which wave vectors lie on a cone surface. If the beams are coherent ant their phases correlate then the conical beam is described by a Bessel function. Such beam is called a Bessel beam and it was introduced by Durnin in 1987 [1]. Here, we call it a coherent conical beam. In contrary, the incoherent conical beam is described by a set of incoherent beams [2].
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