Analysis on the focal spot characteristics of random Gauss phase plate

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• 作者：Chunlin Yang ^{yangchunlin@hotmail.com}
• 关键词：Continuous phase plate ; Gauss random process ; Correlation length ; Focal spot
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：601-607
• 全文大小：979 K
• 卷排序：130

文摘

Gaussian phase plate (GPP) is a special kind of continuous phase plate, which surface figure can be described as a Gaussian random process. In this paper we propose an analysis model to discuss the statistical characteristics of GPP’s focal spot. Using the gradient histogram instead of the diffract integral, the variance of the focus light intensity is analyzed. And the variance reflects the stability of the intensity envelope of the focal spot. Both the deducing process and the numerical simulation are presented. And the results show that the stability of intensity distribution in the focal spot is directly proportional to the correlation length of the phase plate.