The general form of the third-order nonlinear elastic coefficient tensor having the symmetry of the group so (2) was derived with the help of group theoretical methods.
用群论方法导出具有轴转动群so(2)对称性的三阶非线性弹性系数张量的一般形式。
It was confirmed that the resonant of electron could enhance the third-order nonlinear optical coefficient greatly.
电子共振增强有利于提高三阶非线性光学系数。
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