Due to the coupling term of the four-wave mixing, the mode interaction has a symmetric effect on the submodes, inducing the gain suppression on them.
由于引入四波混频耦合项，模相互作用的效应对次级模的影响是对称的，均使次级模受到增益抑制。
Finally, a more accurate calculation result is obtative with a full consideration of the coupling term in both ablative equation and heat-conduction equation.
利用烧蚀和导热计算方程组中二者的结合部，通过充分耦合，获得了更准确的预示计算结果。
It is because that the coupling term due to polarization and the ignored term due to the weakly guiding approximation are as small as the second order, and they are just the same.
最后认为这是由于偏振耦合项是二阶小量，而弱导近似忽略了与之相等的二阶小量耦合项。
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