Theory of fiber optical parametric amplifiers (FOPAs) is introduced and the expression for the gain of FOPAs is deduced from the basic coupled wave equations.
介绍了光纤光学参量放大器的理论，基于耦合波方程推导出光纤光学参量放大器的增益表达式。
The rigorous couple wave theory is used to quantitatively calculate the diffraction electromagnetic fields for TM-polarized and TE-polarized incident optical wave.
针对TM和TE模的入射光，我们采用严格的耦合波原理对金属光栅的表面衍射场进行了计算。
This paper points out the mistake occurring in studying seismic wave by optical method and analyses the current migration theory and methods.
本文指出用物理光学的研究方法来研究地震波时所存在的问题。讨论了目前偏移的理论和方法。
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