主要研究激光束在盐水和沙子两种下垫面上方传输时的波前特性, 并采用自适应光学系统对波前畸变进行校正。建立了激光传输实验平台, 基于自适应光学系统的输入输出数据建立了自适应光学系统模型, 基于该模型设计了自适应光学系统闭环控制器, 对比了激光束在两种下垫面上方传输时的波前畸变特性与自适应光学系统校正的差异。实验结果显示, 在同样辐射加热的条件下, 沙面上方的空气湍流对激光束波前影响更剧烈; 经自适应光学系统校正后, 波前传感器点位移方差在盐水情况下减少了28%, 而在沙子情况下减少了10%。该研究为在海洋环境中利用闭环自适应光学系统进行光束波前畸变校正的可行性做出了初步探索。

Wavefront aberration characterization and correction in laser beam propagating over saline water and sand was investigated in this paper. An experimental setup was built for wavefront aberration measurement and correction by an adaptive optics(AO) system. Based on the input-output data of the AO system, a model was established for the AO system and a closed-loop controller was built. Experimental results show that the laser beam propagating over sands surfers more severe wavefront aberration by the turbulence. After closed-loop AO correction, the variance of the spots displacement in the wavefront sensor is reduced by 28% forsaline water and 10% for sands. By doing this research, the feasibility of using close-loop AO systemsfor wavefront aberration correction in marine environment is investigated.