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arXiv 0812.1160physics.atom-phphysics.ins-det
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双通道自激振荡光学磁力仪

Dual channel self-oscillating optical magnetometer

J. Belfi, G. Bevilacqua, V. Biancalana, S. Cartaleva, Y. Dancheva, K. Khanbekyan, L. Moi

摘要:

本文报道了一种基于非线性磁光旋转效应的双通道磁强计。Cs原子被光学泵浦,并由调谐到D $_2$线的自由运行二极管激光器探测。泵浦激光器的宽频率调制用于产生同步塞曼光泵浦和超精细再泵浦。该磁力计工作在无屏蔽环境中,通过差分测量的方法消除了远距离磁源的杂散信号。在这种情况下,磁力计同时给出磁场模量和场差。共模噪声抑制允许灵敏度为\pthz{2}的高分辨率磁力测量。这种灵敏度与长期稳定性和大带宽相结合,使得可以在5 cm $^3$的测量体积中检测水质子磁化及其自由感应衰减

英文摘要:

We report on a two-channel magnetometer based on nonlinear magneto-optical rotation in a Cs glass cell with buffer gas. The Cs atoms are optically pumped and probed by free running diode lasers tuned to the D$_2$ line. A wide frequency modulation of the pump laser is used to produce both synchronous Zeeman optical pumping and hyperfine repumping. The magnetometer works in an unshielded environment and spurious signal from distant magnetic sources is rejected by means of differential measurement. In this regime the magnetometer simultaneously gives the magnetic field modulus and the field difference. Rejection of the common-mode noise allows for high-resolution magnetometry with a sensitivity of \pthz{2}. This sensitivity, in conjunction with long-term stability and a large bandwidth, makes possible to detect water proton magnetization and its free induction decay in a measurement volume of 5 cm$^3$

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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