This paper designs a remote laser focusing system (RLFS) based on spatial light modulator (SLM). In this system, the SLM serves as an active optical element that modulates the wavefront of the laser beam, causing variation in beam transmission. Theoretical analysis shows that a reflective SLM can compensate the residual aberrations at different operating distances, enabling the accurate focusing of targets without sacrificing the energy convergence. Based on optical design software, the geometrical parameters were optimized for the presented system through simulation. Finally, experimental demonstration and error analysis were carried out. The results show that the proposed RLFS-SLM is more stable and capable for controlling energy convergence than the traditional mechanical RLFS. Our system provides a desirable tool for high-energy laser applications.

本文设计了一种基于空间光调制器（SLM）的远程激光聚焦系统（RLFS）。在该系统中，SLM用作主动光学元件，可调制激光束的波前，从而导致光束透射率发生变化。理论分析表明，反射式SLM可以补偿不同工作距离下的残留像差，从而可以在不牺牲能量会聚的情况下精确地聚焦目标。基于光学设计软件，通过仿真为所提出的系统优化了几何参数。最后进行了实验论证和误差分析。结果表明，所提出的RLFS-SLM比传统的机械RLFS更稳定，能够控制能量收敛。