拉盖尔-高斯光束通过光阑-透镜分离系统的聚焦特性和焦移
Focused field characteristics and focal shift of Laguerre-Gaussian beams passing through an aperture-lens separation system
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摘要: 使用Collins公式推导了拉盖尔-高斯光束通过光阑-透镜分离系统的光强分布。利用数值计算详细分析和说明了其聚焦特性。分析得出光阑-透镜分离程度的大小影响相对焦移的大小和光强的分布，并引起焦移可能相反或消失。而且发现满足一定条件时在一段较大的轴向距离上光强几乎等于光强极大值，从而可获得一个较大的光强极大范围。Abstract: In this paper, the expression for axial intensity distribution of Laguerre-Gaussian beams passing through an aperture-lens separation system is derived using Collins formula. It is shown that aperture-lens separation affects the focal shift and intensity distribution. T he focal shift may be reversed or eliminated. Furthermore, under certain conditions, the intensity in a large axial range is close to the maximum intensity. Thus a large range of maximum intensity can be obtained.
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