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为使发射光束以会聚形式传播,进行了室外450 m和300 m激光聚焦实验。将扩束准直后的光束通过伽利略望远系统,采用精密位移台调整负透镜与正透镜间距,实现不同距离的光斑聚焦。然后用功率计测量450 m焦点处的功率均值为47.67 mW,标准偏差0.67 mW。并利用光束质量分析仪测量聚焦光斑的能量分布。进而采用Matlab中EDGE函数以及Sobel算子进行边界提取,同时进行中值滤波和53H法滤波,最后得到在给定边界提取阈值下的光斑直径为5.56 mm,标准偏差为0.24 mm;光斑中心漂移0.56 mm,占光斑直径10.43%。实验测量聚焦光斑能量损失严重,初步分析为3个因素:受限孔径衍射、激光传输衰减、像差引起光斑弥散。其中衍射和像差引起的衰减占主导,如果进行系统优化设计,可使这两项影响降至最小,通过初步实验研究,为后期进行系统设计提供数据参考。
In order to propagate the emitted beam in a convergent manner, outdoor 450 m and 300 m laser focusing experiments were carried out. The expanded beam collimated beam through the Galileo telescope system, the use of precision displacement stage to adjust the negative lens and the positive lens spacing, to achieve different distances spot focus. The average power at the 450 m focal point measured with a power meter was then 47.67 mW with a standard deviation of 0.67 mW. And use the beam quality analyzer to measure the energy distribution of the focused spot. Then EDGE function in Matlab and Sobel operator are used to extract the boundary, median filter and 53H filtering are performed at the same time. Finally, the spot diameter at the given threshold is 5.56 mm and the standard deviation is 0.24 mm. The center of the spot shifts by 0.56 mm, accounting for 10.43% of spot diameter. Experimental measurement focused light spot energy loss is serious, the initial analysis of three factors: limited aperture diffraction, laser transmission attenuation, aberration caused by spot dispersion. Among them, the diffraction and aberration-induced attenuation dominate. If the system is optimized, these two effects can be minimized. Through preliminary experimental study, it provides data reference for the later system design.