... 费曼图 Feynman diagram 发散困难 divergence difficulty 重整化 renormalization ...
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It is also shown that the second-order moment method of the power density is applicable to the truncated beams and overcomes the divergence difficulty of the beam quality factor.
功率密度的二阶矩方法可用于截断光束，并克服了光束质量因子的发散困难。
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