Their third order optical nonlinearities were studied via a Degenerate Four Wave Mixing (DFWM) technique.
采用背相简并四波混频（DFWM）的方法研究了它们的三阶光学非线性。
The third order nonlinear optical property of PMOCOPV was studied by degenerate four wave mixing(DFWM).
采用简并四波混频（DFWM ）方法研究了PMOCOPV的三阶非线性光学性质。
In this paper, degenerate four-wave mixing was studied in various transparent optical media.
本文研究了各种透明介质的简并的四波混频作用。
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