论文标题
{\ it s}的自旋选择规则在近距离和非携带两光激发下的原子rubidium中的水平过渡
Spin selection rule for {\it S} level transitions in atomic rubidium under paraxial and nonparaxial two-photon excitation
论文作者
论文摘要
我们报告了原子中两光子转变的自旋选择规则的实验测试。特别是，我们证明了$ 5S_ {1/2} \至6s_ {1/2} $过渡速率在rubidium气体中的过渡速率遵循与激发光的极化相关的二次依赖性。为了通过热蒸气电池中的单个高斯梁或两个对抗横梁进行激发，过渡速率缩放为线性极化的平方度。当圆形极化时，速率达到零。相反，当激发通过光学纳米纤维附近的ivanevan虫实现时，只能通过改变纤维引导的光的极化来完全熄灭两光子转变（理论上，在我们的实验条件下，不低于最大速率的13 \％）。我们的发现导致对原子中多光的物理学的更深入了解，以强烈的非副作用。
We report on an experimental test of the spin selection rule for two-photon transitions in atoms. In particular, we demonstrate that the $5S_{1/2}\to 6S_{1/2}$ transition rate in a rubidium gas follows a quadratic dependency on the helicity parameter linked to the polarization of the excitation light. For excitation via a single Gaussian beam or two counterpropagating beams in a hot vapor cell, the transition rate scales as the squared degree of linear polarization. The rate reaches zero when the light is circularly polarized. In contrast, when the excitation is realized via an evanescent field near an optical nanofiber, the two-photon transition cannot be completely extinguished (theoretically, not lower than 13\% of the maximum rate, under our experimental conditions) by only varying the polarization of the fiber-guided light. Our findings lead to a deeper understanding of the physics of multiphoton processes in atoms in strongly nonparaxial light.
