This paper proposes the Fuzzy Control Iterative Algorithm (FCIA) for the design of diffractive optical elements for laser
beam shaping. Firstly, to improve the poor uniformity of output laser beam obtained by the G-S algorithm, we put
forward the Profile Smoothing Algorithm (PSA), which is effective in improving beam uniformity but slack in
controlling the Mean Square Error. Then we put forward the Fuzzy Control Iterative Algorithm, which combines PSA
and G-S algorithm by fuzzy control theory. Taking advantages of GS and PSA, FCIA can decrease both Mean Square
Error and nonuniformity of output beam simultaneously. Computer-designed result shows that an extremely ideal output
beam is derived by using FCIA. The Mean Square Error is 0.75%. The nonuniformity is 0.46%. And the energy
converting efficiency is up to 94.91%. This paper affords a novel algorithm for the design of diffractive optical elements
for laser beam shaping.
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