利用控制laser研究亚自然宽度的偏振-旋转共振
Polarization-rotation resonances with subnatural widths using a control laser
摘要：
我们证明了极窄的共振极化旋转的原子蒸汽。共振是使用强控制激光在同一跃迁上产生的，由于磁子能级之间的光泵浦，该跃迁使原子极化。随着控制激光器中功率的增加，产生了连续的高阶嵌套偏振旋转共振，线宽逐渐变窄。我们研究了这些共振的Rb的$D_2$线在室温下的蒸汽细胞，并证明了$0.14 \, Γ$的宽度为三阶旋转。基于简化的$Λ$ V型能级结构的解释得到了系统密度矩阵分析的证实。共振的色散线形和亚自然宽度自然地适用于激光锁定原子跃迁和精密测量等应用。
英文摘要：
We demonstrate extremely narrow resonances for polarization rotation in an atomic vapor. The resonances are created using a strong control laser on the same transition, which polarizes the atoms due to optical pumping among the magnetic sublevels. As the power in the control laser is increased, successively higher-order nested polarization rotation resonances are created, with progressively narrower linewidths. We study these resonances in the $D_2$ line of Rb in a room-temperature vapor cell, and demonstrate a width of $0.14 \, Γ$ for the third-order rotation. The explanation based on a simplified $Λ$V-type level structure is borne out by a density-matrix analysis of the system. The dispersive lineshape and subnatural width of the resonance lends itself naturally to applications such as laser locking to atomic transitions and precision measurements.
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