5 September 2002 Precise design of the pure phase element for quasi-annular beam shaping
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The phase distribution design process of the pure phase element (PPE) used for quasi-annular beam shaping is introduced in this paper. A new optimization algorithm named Quasi-Gradient Descent (Quasi-GD) algorithm has been developed and used here to meet such design requirement. With a more restrictive sampling mode named precise sampling in the optimization, the simulated result shows that the uniformity of energy distribution on the focal plane is invariant with different sampling intervals and the true beam shaping effect is achieved.
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Yuan Wu, Junzhong Xu, Yiqiong Zhao, Shaojun Fu, Yongping Li, "Precise design of the pure phase element for quasi-annular beam shaping", Proc. SPIE 4914, High-Power Lasers and Applications II, (5 September 2002); doi: 10.1117/12.481754; https://doi.org/10.1117/12.481754


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