“罗马穹顶”由于它独特的几何外形，将阿雷西博球形碟面反射来的信号聚焦到它内部的一个点上。
The Gregorian dome, due to its unique geometrical shape, focuses the signal reflected by Arecibo spherical dish one a single point inside the dome.
本文利用高斯分解法给出了聚焦光学系统中光学非线性介质引起的光学限制效应，以及几何排布对其的影响。
This paper presents the optical limiting and its dependence of the geometrical arrangement in the focused optical system by employing the Gaussian decomposition method.
分析也表明，聚焦几何排布可用于非线性折射系数的测量，并具有比常规Z扫描方法更高的灵敏度。
It is also shown that focused geometry arrangements can be employed for measurements of nonlinear refractive index with a higher sensitivity than that of common Z scan techniques.
严格、详细地证明了弯曲时空几何光学中的聚焦定理。
The focusing theorem of geometric optics in curved space-time be proved strictly and in detail.
从几何光学理论证明了，在左手系材料（负折率材料）透镜中存在完善聚焦的概念。
The perfect focusing concept is proposed in lenses made of Left handed materials (or negative index materials) by means of geometrical optics.
分析也表明，利用聚焦的几何排布测量材料的非线性系数，具有比常规Z扫描方法更高的灵敏度。
Meanwhile, the analysis also shows that the sensitivity of Z scan technique with the focused optical system is higher than that of common Z scan technique.
分析也表明，利用聚焦的几何排布测量材料的非线性系数，具有比常规Z扫描方法更高的灵敏度。
Meanwhile, the analysis also shows that the sensitivity of Z scan technique with the focused optical system is higher than that of common Z scan technique.
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