激光与光电子学进展, 2018, 55 (3): 030103, 网络出版: 2018-09-10
无波前传感器的自适应光学校正 下载: 1738次
Adaptive Optics Correction of Wavefront Sensorless
大气光学 自适应光学 无波前传感器 多相位屏传输 随机并行梯度下降算法 atmospheric optics adaptive optics wavefront sensorless multi-phase screen propagation stochastic parallel gradient descent algorithm
摘要
激光在大气湍流中传输时会发生波前畸变,从而降低无线光通信系统的性能。采用基于随机并行梯度下降(SPGD)算法的无波前传感器自适应光学校正系统对远场的畸变波前进行校正。模拟结果表明,校正后系统的斯特列尔比由0.15提高到0.81,远场光斑能量更加会聚。以CCD相机探测到的远场畸变光斑光强值作为系统的目标函数,实验验证了SPGD算法对不同畸变像差光的校正情况。经校正,目标函数(中心900个像素点的灰度均值)由26.5,44.6,110.6分别上升到77.2,93.4,208.5,斯特列尔比由0.23,0.39,0.48分别上升到0.67,0.75,0.86,中心光强值增大且光斑能量会聚,该结果与理论结果相吻合。
Abstract
Wavefront aberration occurs during laser propagating in the atmospheric turbulence, which reduces the performance of wireless optical communication system. We use a wavefront sensorless adaptive optics correction system based on the stochastic parallel gradient descent (SPGD) algorithm to correct the far field wavefront aberration. The simulation results indicate that the Strehl ratio of the proposed system is increased from 0.15 to 0.81, and the far field spot energy becomes converged. We take the intensity of the far field distorted spot detected by CCD camera as the objective function of the system, and experimentally verify the correction performances for different aberrations by the SPGD algorithm. After correction, the objective functions (the mean gray value of 900 pixels in the center) increase from 26.5 to 77.2, from 44.6 to 93.4, and from 110.6 to 208.5, respectively; the Strehl ratios increase from 0.23 to 0.67, from 0.39 to 0.75, and from 0.48 to 0.86, respectively. The central light intensity increases and the spot energy becomes converged. The experimental results are in good agreement with theoretical results.
吴加丽, 柯熙政. 无波前传感器的自适应光学校正[J]. 激光与光电子学进展, 2018, 55(3): 030103. Jiali Wu, Xizheng Ke. Adaptive Optics Correction of Wavefront Sensorless[J]. Laser & Optoelectronics Progress, 2018, 55(3): 030103.