The nonlinear refraction index n2 were estimated according to the closed-aperture Z-scan curves.
根据闭孔Z-扫描曲线估算了样品的非线性折射率。
The structure of multiple-aperture radiation element is a closed cavity which cant be processed with normal machining method and have to be disparted to several parts.
多口径辐射单元结构是一个封闭的腔体，采用常规的机械加工方法无法实现，必须将其分解成几个结构件分别加工，再将其连接成腔体。
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