光寻址液晶空间光调制器用于激光光束整形的可控系统和设计算法

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.

Controllable system and design algorithm for laser beam shaping using optical addressing liquid crystal spatial light modulator

To achieve real-time controllable laser beam shaping,a system using an optical addressing liquid crystal spatial light modulator(LC-SLM)and a phase algorithm were presented.Simulation results of the geometrical transform method and G-S algorithm for shaping a Gaussian beam with amplitude modulation and phase distortion to a uniform distribution flat-top beam were analyzed.The output beamobtained by the geometrical transform method can have a uniform distribution with small scale,while the G-S algorithm can improve the unevenness of the incident beam with large scale.In order to decrease both the error of root mean square and the unevenness on the top of the output beam,a new algorithm was developed that combined the geometrical transform method and the G-S iterative algorithm.The phase distribution function from the geometrical transform was used as the initial phase distribution function in the iterative process of the G-S algorithm.The simulation results show that the improved algorithm is effective in both decreasing the unevenness and obtaining a suitable output beam.