三能级级联系统中的双光子和EIT辅助多普勒冷却
Two-photon and EIT-assisted Doppler cooling in a three-level cascade system
摘要：
激光冷却的理论研究采用级联三能级方案，其中激光驱动跃迁的激发态通过第二激光耦合到顶部，更稳定的水平，如碱土金属原子。第二个激光作用修改原子散射截面，并产生低于多普勒冷却下过渡所达到的温度。当由第二激光器引起的多光子过程是相关的时，电磁感应的透明性修改第一激光器的吸收，并且最终温度由第二激光器参数控制。当中间态仅被虚激发时，动力学过程由双光子过程主导，最终温度由顶态的自发衰变率决定。
英文摘要：
Laser cooling is theoretically investigated in a cascade three-level scheme, where the excited state of a laser-driven transition is coupled by a second laser to a top, more stable level, as for alkali-earth atoms. The second laser action modifies the atomic scattering cross section and produces temperatures lower than those reached by Doppler cooling on the lower transition. When multiphoton processes due to the second laser are relevant, an electromagnetic induced transparency modifies the absorption of the first laser, and the final temperature is controlled by the second laser parameters. When the intermediate state is only virtually excited, the dynamics is dominated by the two-photon process and the final temperature is determined by the spontaneous decay rate of the top state.
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