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arXiv 2102.00947physics.optics
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自旋噪声的喇曼散射模型

Raman scattering model of the spin noise

G. G. Kozlov, A. A. Fomin, M. Yu. Petrov, I. I. Ryzhov, V. S. Zapasskii

摘要:

从光散射理论的角度分析了自旋噪声谱(SNS)中偏振信号的形成机理。在单次散射近似下,对SNS中记录的偏振信号(法拉第旋转或椭圆率)进行了严格的计算。我们表明,它是最正确的考虑这种噪声作为一个结果的散射的探测光束波动的磁化率的介质。波动的旋(反对称)部分的磁化率张量导致外观的典型的SNS法拉第旋转噪声在拉莫尔频率。同时,波动的线性各向异性的介质(对称部分的磁化率张量)引起的椭圆噪声的探测光束光谱定位在双拉莫尔频率。理论分析的结果与铯蒸气中椭圆噪声的实验数据符合得很好。

英文摘要:

The mechanism of formation of the polarimetric signal observed in the spin noise spectroscopy (SNS) is analyzed from the viewpoint of the light scattering theory. A rigorous calculation of the polarimetric signal (Faraday rotation or ellipticity) recorded in the SNS is presented in the approximation of single scattering. We show that it is most correctly to consider this noise as a result of scattering of the probe light beam by fluctuating susceptibility of the medium. Fluctuations of the gyrotropic (antisymmetric) part of the susceptibility tensor lead to appearance of the typical for the SNS Faraday rotation noise at the Larmor frequency. At the same time, fluctuations of linear anisotropy of the medium (symmetric part of the susceptibility tensor) give rise to the ellipticity noise of the probe beam spectrally localized at the double Larmor frequency. The results of the theoretical analysis well agree with the experimental data on the ellipticity noise in cesium vapor.

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