5 November 2010 Simulated annealing algorithm applied in adaptive near field beam shaping
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Laser beam shaping is required in many applications for improving the efficiency of the laser systems. In this paper, the near field beam shaping based on the combination of simulated annealing algorithm and Zernike polynomials is demonstrated. Considering phase distribution can be represented by the expansion of Zernike polynomials, the problem of searching appropriate phase distribution can be changed into a problem of optimizing a vector made up of Zernike coefficients. The feasibility of this method is validated theoretically by translating the Gaussian beam into square quasi-flattop beam in the near field. Finally, the closed control loop system constituted by phase only liquid crystal spatial light modulator and simulated annealing algorithm is used to prove the validity of the technique. The experiment results show that the system can generate laser beam with desired intensity distributions.
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Zhan Yu, Zhan Yu, Hao-tong Ma, Hao-tong Ma, Shao-jun Du, Shao-jun Du, } "Simulated annealing algorithm applied in adaptive near field beam shaping", Proc. SPIE 7848, Holography, Diffractive Optics, and Applications IV, 78480Q (5 November 2010); doi: 10.1117/12.871683; https://doi.org/10.1117/12.871683

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