Measurements of trap parameters of a magneto-optical trap by parametric resonance
Measurements of trap parameters of a magneto-optical trap by parametric resonance
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通过参量共振测量磁光陷阱的陷阱参数
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
W. Jhe
中科院分区：
文献类型：
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作者：
Kihwan Kim;H. Noh;W. Jhe
我们提出了一种通过参量共振测量磁光原子陷阱的陷阱频率或弹簧常数的方法。当冷却激光的强度调制为其共振陷阱频率的两倍左右时，被捕获的原子被参数激发并分为两组，以 $ensuremath{pi}$ 的运动相位差振荡。我们发现，当调制幅度降低至其阈值时，可以测量自然陷波频率。实验结果与基于速率方程模型的三维多普勒冷却理论吻合较好。
We present a method to measure the trap frequency or the spring constant of a magneto-optical atom trap via the parametric resonance. When the intensity of the cooling laser is modulated at around twice its resonant trap frequency, the trapped atoms are parametrically excited and divided into two groups oscillating with the motional phase difference of $ensuremath{pi}$. We find that one can measure the natural trap frequency as the modulation amplitude is decreased down to its threshold value. The experimental results are in good agreement with the three-dimensional Doppler cooling theory based on the rate equation model.