Non-vortex/vortex powers ratio dependence on radial step height of a spiral phaseplate
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- 作者：A.E. Martirosyan armar@ipr.sci.am
- 关键词：Vortex ; Non-vortex ; Spiral phaseplate ; Radial step ; Diffraction
- 刊名：Optik - International Journal for Light and Electron Optics
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：131
- 期：Complete
- 页码：1003-1006
- 全文大小：351 K
- 卷排序：131
文摘
In this paper, the influence of radial step height of a spiral phaseplate on an optical diffraction structure is described. We consider a general case, when a radial step height is any rational quantity. This approach allows to investigate non-vortex and vortex beam powers dependence on this quantity. Solving the Fresnel integral, we obtain an optical on-axis intensity distribution. The presence of energy in this line indicates that a non-vortex beam component exists in the diffraction pattern. Integration results show that the power envelope of a non-vortex component is reduced with increasing of a normalized radial step height.