This primary containment vessel looks like an old-fashioned light bulb turned upside down and balanced on top of a doughnut.
这个主安全壳像一个被倒置的老式灯泡，在一个环状体的顶部保持平衡。
The experimental method used to form doughnut laser trap through axicons and by extracting high order diffractive light component is introduced.
介绍了用锥镜法和取高级衍射光斑法来实现空心光阱的实验方法。
But, when the doughnut laser beam is used as trapping light, relative index can be less than 1. The beam waist of focused laser beam has a virtual affection for the trapping force.
但是，在空心光束中可以实现对地折射率粒子的稳定捕获，即粒子的相对折射率可以小于1。
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