Focused intensity distribution and focal shift in Sinh-Gaussian beams whose on-axis intensity is zero are studied based on the encircle-power criterion.
6.使用环围功率法研究了轴上光强为零的双曲正弦高斯光束的聚焦光强分布和焦移。
参考来源 - 光束的聚焦特性研究：焦移，焦开关和相移It’s interesting that the focusing for Gaussian beam with a left-handed material coincide with imaging formalism of geometrical optics and do not exist focal shift.
同时,我们还发现像方高斯光束束腰的位置和几何光学预言的成像位置是完全一致的,即平板左手材料透镜对傍轴光束的聚焦不存在一般透镜聚焦的焦移现象。
参考来源 - 人工电磁材料的光学特性及应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
实验测定了波带板的焦移，接近与广义程函数理论。
Focal shifts in diffractive Fresnel lens are measured. The result is closer to the theory given by generalized eikonal.
通过数值计算，对各个参数对光强分布和焦移的影响进行了分析。
On the accurate and intuitional formula, each parameter related to axial optical intensity distribution and focal shifts is analyzed through numerical calculation.
研究结果表明，通过旋转半波片的角度可以实现焦移量的实时控制。
The research result shows that with the designed pupil filter the axial focal shift can be controlled by rotating the half-wave plate.
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