要让这些激发的原子发射激光,这依赖于激光束焦点两个决定性的性质。
Getting these atoms to lase then relied on two crucial properties of the beam's focus.
第一种方案是调整被称为“光镊”的著名效应,在其中对象物体可被困在一条或两条激光束的焦点上。
One is an adaptation of a well-known effect called "optical tweezers" in which objects can be trapped in the focus of one or two laser beams.
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