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arXiv physics/0503111physics.atom-phphysics.ins-det
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原子微波功率标准的准确度

Accuracy of an Atomic Microwave Power Standard

David C. Paulusse, Nelson L. Rowell, Alain Michaud

摘要:

利用激光冷却原子与电磁相互作用建立了原子微波功率标准。原子穿过波导传输线,在辐射的作用下,内部态布居发生拉比跳跃振荡。振荡频率的测量允许确定入射微波功率。在20 dB的动态范围内观察到多达60次振荡,测量的标准偏差约为0.02%。测量的频率进行了比较,计算和协议的1.3%,5%的不确定性(矩形)被发现。

英文摘要:

We have built an atomic microwave power standard based on the electromagnetic interaction with laser-cooled atoms. The atoms traversed a waveguide transmission line, and under the effect of the radiation, the internal state populations underwent a Rabi flopping oscillation. Measurement of the oscillation frequency allowed the determination of the incident microwave power. As many of 60 oscillations were observed over a dynamic range of 20 dB and the standard deviation of the measurements was about 0.02%. The measured frequency was compared to a calculated one and an agreement of 1.3% with an uncertainty of 5% (rectangular) was found.

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