基于铷原子D1线塞曼能级间跃迁的光脉冲减速

基于铷原子D1线塞曼子能级间跃迁，可以观察到光脉冲减速现象。在实验中，当一束弱的右旋圆偏振探测光和一束强的左旋圆偏振耦合光同时耦合87Rb原子D1线F=2→F’=1塞曼子能级间跃迁时，就能在原子介质中获得高色散低吸收的电磁诱导透明现象，观察到光脉冲减速效应。耦合光越弱，光脉冲减速越大；光脉冲宽度越小，光脉冲延迟时间与脉冲宽度的比值越大。

Slow light pulse based on transitions between Zeeman sublevels of D1 line in rubidium atoms

It is possible to observe slow light based on transitions between Zeeman sub-levels of D1 line in rubidium atoms. In the experiment, when two laser beams with opposite circular polarizations (σ- and σ+), called probing and coupling light respectively, couple transitions between Zeeman sub-levels of D1 line F=2→F'=1 in rubidium atoms, electromagnetically induced transparency (EIT) with reduced?absorption and enhanced?dispersion is achieved in the atomic medium and simultaneously results in slow light. The reduction of the group velocity becomes more obvious with decreasing power of the coupling light and the ratio between the delay time to the pulse width is big for a pulse with a small width.