建立了固体激光器矩形光斑光束合成的理论模型,对诺·格公司给出的2束、4束、8束合成实验结果进行分析,并通过数值模拟,得到了不同子束排列方式下合成光斑的远场图形.通过仿真模拟可以得出:排列结构影响远场光斑的形状；子束间距决定了合成光束远场光斑的衍射旁瓣的大小和多少.采用环围能量进行分析,研究了远场光斑中主瓣能量随激光阵列占空比的变化.结果显示,远场光束环围功率随子束间距的增大而逐渐下降,而且参与相干合成子束越多,下降越大.%The mathematical model of coherent combination for rectangle beams array is established. Experimental results of Northrop Grumman Corporation are analyzed, such as two beam combination, four beam combination, eight beam combination. Then applying this model, it is simulated on the computer that intensity distribution of combined far-field spots changes in various conditions. Results show that aperture filling method determines the figure of far-field spots, and interval among beamlets deter-mines distribution of energy and number of diffraction ring, and some useful results are obtained with Power-in-the-bucket calcula-tion. The simulated results show, Power-in-the-bucket of far field spot descends with increasing distance among beamlets and number of beamlets.
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