基于相干布居囚禁现象的高对比度钟跃迁信号

High Contrast Atomic Clock Signal Based on Coherent Population Trapping

研究了基于相干布居囚禁（CPT）现象的平行线偏振相干激光所激发的。^87Rb原子，并获得了对比度较高的CPT共振信号。实验结果表明，平行线偏光激发方案是一种很有前途的能替代传统双色圆偏振光激发原子的实施方案。该方案结构简单，功耗小，有较好的用于高稳定度小型化CPT原子钟的前景。

An experimental investigation of the coherent population trapping （CPT） resonance excited on the D1 line of ^87 Rb atoms by bichrornatic parallel linearly polarized laser light is presented. The experimental results show that a lin ^II lin transition scheme is a promising alternative to the conventional circular-circular transition scheme for an atomic clock. Compared with the circular light transition scheme, linear light accounts for high-contrast transmission resonances, which makes this excitation scheme promising for CPT atomic clock.