在双模光场情形，模间耦合对产生一阶类相变的影响不可忽略。
For the two-mode laser case the influence of the mode coupling to the first-order-like transition can not been neglected.
讨论了单模光纤的偏振模色散PMD，包括PMD与单模光纤的几何尺寸及应力的非圆对称的关系；模间耦合的影响。
The PMD in singlemode fiber, including the relationships between PMD and the circular asymmetries of geometry and stress in fiber, the influence of mode coupling on PMD, are discussed.
我们发现，这两种磁序的表面模的频率随外场和层间耦合的变化情况很不同。
We find that in the voigt geometry the frequency of surface modes versus the external magnetic field and the interlayer coupling is very different in these two different magnetic orderings.
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