在双变形镜自适应光学系统中,需要主激光出射时与信标光的振幅分布一致、相位共轭,当主激光到达目标时光波的分布与目标上发射的信标光光波分布相同,主激光的振幅和相位都得到校正。根据双变形镜自适应光学技术的概念,提出一种基于自适应光学技术控制光束近场场强的方法,从而实验验证双变形镜技术的可行性。该方法利用哈特曼传感器探测到的波前信息,对变形镜进行控制,实现了对光束近场场强的控制。仿真结果表明该系统对光束近场强度能进行较好地校正,使校正前后光束振幅的残余均方差值从0.310 0降为0.052 2,同时实验也验证了这种方法的可行性。

In two-deformable-mirror adaptive optics system,the outing main laser compare to the beacon light has the same amplitude distribution and conjugated phase,when the main laser achieve the goal,the main laser's beam front is same to the beacon light in the goal,the main laser's amplitude and phase have been corrected. According to the two deformable mirror adaptive optics technology,this paper presents a method based on adaptive optics system to control the near-field intensity of laser beam,from experiment to validate the feasibility of dual deformable mirror technology. This method uses the Hartmann-Shack (H-S) wave-front sensor to detect the wave-front information,control of the deformable mirror to achieve controlling the near-field intensity of laser beam. The simulation results show the system can correct the near-field intensity of laser beam successfully,so that the residual mean square amplitude margin of the beam before and after correction has been improved from 0.3100 to 0.0522 ,while the experiment is also verified the approach of this method.