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提出了一种利用光寻址液晶空间光调制器(LC-SLM)来实现实时可控的激光光束整形的系统和算法。用几何变换法和盖师贝格-撒克斯通(G-S)算法对有振幅调制和位相畸变光束进行均匀分布的平顶光束整形及数值模拟,用几何变换法可以得到非常好的小尺度的均匀性输出光束,而G-S算法能够有效地改善入射光束的大尺度不均匀性。为了减少输出光束的均方根误差和顶部不均匀度,提出结合几何变换方法和G-S算法,由几何变换方法得到的相位分布为G-S算法的初始相位分布。计算机设计的仿真结果表明:利用这种算法可以有效减少大尺度的不均匀度值,并得到合适的输出光束。
A system and algorithm for realizing real-time controllable laser beam shaping using LC-SLM (Light Addressable Liquid Crystal Spatial Light Modulator) is proposed. Using the geometric transformation method and the cover-up Berg-Saxon (GS) algorithm, the flattened beam shaping and numerical simulation of uniform amplitude-modulated and phase-distorted beams are uniformly distributed. By using the geometric transformation method, a very good small-scale Uniform output beam, and GS algorithm can effectively improve the large-scale non-uniform incident beam. In order to reduce the root mean square error and top unevenness of the output beam, the phase distribution obtained by the geometric transformation method is the initial phase distribution of the G-S algorithm by combining the geometric transformation method and the G-S algorithm. Computer simulation results show that: the use of this algorithm can effectively reduce the large-scale non-uniformity values, and get the appropriate output beam.