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。

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Photonic RF phase shifters based on OTTD (optical true time delay), heterodyne mixing technique and vector sum technique were introduced. The principles and features were proposed and analyzed.

介绍了基于光实时延迟线、基于外差混频技术和基于矢量和技术的光子射频移相器，对其工作原理和技术特点作了分析。

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By using femtosecond laser, the off-resonant third-order optical nonlinearity of the compound was measured with degenerate four-wave mixing technique.

采用飞秒激光，运用简并四波混频法，研究了化合物在非共振状态下的三阶非线性光学性能。

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