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arXiv physics/0201025physics.atom-ph
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调频光非线性磁光旋转

Nonlinear magneto-optical rotation with frequency-modulated light

D. Budker, D. F. Kimball, V. V. Yashchuk, M. Zolotorev

摘要:

一个磁力技术证明,可能是适合于精确测量的领域,从亚微高斯级以上的地球场。它是基于共振非线性磁光旋转所造成的原子包含在一个汽室与抗弛豫壁涂层。线性偏振的调频激光用于光泵浦和探测。如果在调制频率的第一谐波处测量时间相关的旋光度,则在接近零的磁场处以及在拉莫尔频率与光调制频率的一半一致的场处观察到超窄(~几Hz)共振。在优化后,该技术的灵敏度预计将超过10^{-11} G/sqrt{Hz}。

英文摘要:

A magnetometric technique is demonstrated that may be suitable for precision measurements of fields ranging from the sub-microgauss level to above the Earth field. It is based on resonant nonlinear magneto-optical rotation caused by atoms contained in a vapor cell with anti-relaxation wall coating. Linearly polarized, frequency-modulated laser light is used for optical pumping and probing. If the time-dependent optical rotation is measured at the first harmonic of the modulation frequency, ultra-narrow (~a few Hz) resonances are observed at near-zero magnetic fields, and at fields where the Larmor frequency coincides with half the light modulation frequency. Upon optimization, the sensitivity of the technique is expected to exceed 10^{-11} G/sqrt{Hz}.

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