进一步分析发现，膜厚通过影响矫顽场强和最大极化强度进而影响铁电薄膜的电压非线性。
It is found that the film thickness dependence of the dielectric nonlinearity is determined by that of the coercive electric field and the maximal polarization.
讨论单轴晶体中三阶非线性自作用极化强度矢量的计算。
The third-order nonlinear polarization for self-interaction in uniaxial crystals is dealt with.
而且，在选择最佳微波场强度条件下，通过控制耦合场的大小，非线性极化率可以被进一步地提高。
The physical mechanism of the obtained giant nonlinear susceptibility is mainly based on interactions between microwave field and coupling fields.
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