研究目的
To design a remote laser focusing system (RLFS) based on spatial light modulator (SLM) that can accurately focus targets at different distances without sacrificing energy convergence.
研究成果
The RLFS-SLM reduced the diameter of the focused spot by 19%~28% and enhanced the energy intensity by 58%~110% compared to the traditional mechanical RLFS. The system is cost-effective, flexible, and a promising technique for high-energy laser applications. Future research will explore the SLM design for more operating positions and quantify errors induced by system assembly, thermal, nonlinear or other effects.
研究不足
The deviations between the collected spots and the designed spots may arise from the complexity of light transmission in real-world scenarios, slight misalignment between the optical axis of the monitoring camera and the normal line of the diffuse reflector, assembly error of the experimental device, and intrinsic errors of the mechanical structure.
1：Experimental Design and Method Selection:
The RLFS-SLM was designed and optimized based on five operating distances, with the primary mirror designed at the operating distance of zf
2：The focal length of the secondary mirror (SLM) was computed for different operating distances. Sample Selection and Data Sources:
A high-energy fiber laser was used with parameters set as λ= 1,080nm, ω0 = 22mm, and operating distances from
3：5km to 5km. List of Experimental Equipment and Materials:
The system consists of a high-energy fiber laser, a secondary mirror (SLM), a primary mirror, a diffuse reflector, a camera, a filter, and a monitor.
4：Experimental Procedures and Operational Workflow:
The experiment involved zero setting, system initialization, experiments of focused spots at different distances, and a contrast experiment with the traditional mechanical RLFS.
5：Data Analysis Methods:
The wavefront error was minimized through optimization of the Zernike polynomials of the secondary mirror (SLM), and the convergence of focused spots was analyzed on LightTools.
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