Circadian clocks
Circadian clocks
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作者：
S. Abdulla
因此，为了获得更准确的结果，需要更从容的测量态度。这就是“原子喷泉”背后的原理，这是一种首先在三束交叉激光束的光学“糖蜜”中冷却原子的装置，然后轻轻地垂直发射它们，使它们在重力作用下回落。这样就可以在激光场的扰动影响之外探测原子。
So to get a more accurate result, one needs a more leisurely attitude to measurement. This is the principle behind the ‘atom fountain’, a device that first cools atoms within an optical ‘molasses’ of three crossed laser beams before gently launching them vertically so that they fall back under gravity. The atoms can then be probed outside the perturbing influence of the laser field.