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按晶体波片的快轴与水平方向成0°、45°、0°、45°顺序排列构造四波片偏振控制器。固定各波片的快慢轴,利用模拟退火算法进行反馈控制,通过改变各波片的相位得到所需的偏振态。仿真结果说明,利用模拟退火算法进行负反馈控制,其收敛速度较快,收敛后光强波动小于2%;该控制器能在各波片相移范围限制在0~2π情况下实现偏振态的无端控制。为消除可能出现的复位死角,在模拟退火算法基础上加入强制无端复位方法,复位过程稳定。控制过程中该控制器各波片的相移步长可变,但寻优过程中最大步长不超过3.36°,强制复位过程中最大步长不超过18°,因此控制电压的变化平缓。
According to the fast axis of the crystal wave plate and the horizontal direction of 0 °, 45 °, 0 °, 45 ° arranged in order to construct a four-wave plate polarization controller. The fast and slow axes of each wave plate are fixed, and the simulated annealing algorithm is used for feedback control. The desired polarization state is obtained by changing the phase of each wave plate. The simulation results show that the simulated annealing algorithm performs negative feedback control with faster convergence rate and less than 2% fluctuation of light intensity after convergence. The controller can achieve the polarization state when the phase shift range of each wave plate is limited to 0 ~ 2π Uncontrolled. In order to eliminate the possible dead angle of resetting, the forced resetting method is added to the simulated annealing algorithm, and the resetting process is stable. During the control process, the phase-shift step length of each wave plate of the controller is variable, but the maximum step length in the optimization process does not exceed 3.36 ° and the maximum step length in the forced reset process does not exceed 18 °. Therefore, the variation of the control voltage is gentle.