自旋1系统自旋噪声谱中的双折射和二向色性效应
Birefringence and dichroism effects in the spin noise spectra of a spin-1 system
摘要：
我们在室温下用一束频率与D0线蓝失谐的探测光对亚稳态氦原子进行了自旋噪声谱实验。从理论和实验两方面对圆双折射涨落（法拉第噪声）和线性双折射涨落（椭圆率噪声）进行了研究。特别是，它示出，在这两种情况下，但对于不同的光失谐，两个噪声共振被隔离在拉莫尔频率和拉莫尔频率的两倍的行为，这强烈依赖于探测场极化的方向。亚稳态氦的简单结构使我们能够探测、模拟和解释这些峰在圆二色性和线性二色性以及自旋振荡模式方面的行为变化。
英文摘要：
We perform spin noise spectroscopy experiments in metastable helium atoms at room temperature, with a probe light whose frequency is blue detuned from the D0 line. Both circular birefringence fluctuations (Faraday noise) and linear birefringence fluctuations (ellipticity noise) are explored theoretically and experimentally. In particular, it is shown that in both cases but for different optical detunings, two noise resonances are isolated at the Larmor frequency and at twice the Larmor frequency with a behaviour, which strongly depends on the orientation of the probe field polarization. The simple structure of metastable helium allows us to probe, model and explain the changes in the behavior of these peaks in terms of circular and linear dichroisms and birefringences as well as in terms of spin oscillation modes.
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