排序方式: 共有27条查询结果,搜索用时 15 毫秒
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We demonstrate experimentally an atomic magnetometer based on optical pumping theory, a magnetic resonance that is induced by a radio frequency field and dependent on the magnetic field strength. Compared with the conventional method using one radiation field, which is used not only as the probe beam but also as a pump beam, the additional re-pump beam can increase remarkably the amplitude of the signal. It is shown that the amplitude of the magnetic field resonance signal can increase more than 55% by using an additional re-pump beam, which makes the sensitivity of the magnetometer higher. Finally, we investigate the relation between amplitude of the signal and re-pump laser power, and calculate the atomic population in the trapping states with rate equations. 相似文献
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近年来人们在激光冷却和捕获原子方面取得了辉煌的成就.对捕获的冷原子团温度、密度的精确测量也成为一个重要的研究课题.在冷原子温度测量中需要在较短时间内(最长不超过几个毫秒)迅速关断俘获冷原子的磁光阱(包括磁场和光场).作者针对时间飞行法测量冷原子温度对光场和磁场的关断要求,设计并制作了一种简单、实用的可调脉冲延时和脉宽的脉冲发生器,应用其产生的脉冲在较短时间内有效地关断磁场和光场,达到冷原子温度测量的要求. 相似文献
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证明了每个充分大的奇数N可以表为九个几乎相等的素数的立方之和,这一结果与先前在广义黎曼猜想下得到的结果一样强. 相似文献
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We present an experimental and theoretical investigation of the coherent population trapping (CPT) resonance excited on the D1 line of 87Rb atoms by bichromatic linearly polarized laser light. The experimental results show that a lin||lin tran- sition scheme is a promising alternative to the conventional circular-circular transition scheme for an atomic magnetometer. Compared with the circular light transition scheme, linear light accounts for high-contrast transmission resonances, which makes this excitation scheme promising for high-sensitivity magnetometers. We also use linear light and circular light to detect changes of a standard magnetic field, separately. 相似文献
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针对实验中磁场对超冷原子团温度和密度的测量的影响,提出了用三组轴向相互垂直的线圈产生的磁场来补偿的理论模型,并根据实验条件对理想模型进行修正.通过这个理论模型,不仅能达到空间某点磁屏蔽的要求,而且可以准确预计有关实验环境的磁感应强度分布. 相似文献