原子在压缩光场中的吸收与色散

ATOMIC ABSORPTION AND DISPERSION IN SQUEEZED LIGHT FIELD

本文导出了一二能级原子系综与多模压缩光场相互作用的Bloch方程。在此基础上求得了原子对压缩光的吸收与色散。结果表明,对于不同的压缩条件,吸收线型呈现亚自然与超自然线宽现象。而原子的色散行为明显依赖于光场起伏的压缩方向与振幅的相干激发方向。当这两个方向不平行或垂直时,色散零点相对于原子跃迁频率发生移位。

In this paper, the optical Bloch equations of a two-level atom ensemble driven by squeezed light field are derived. Based on these equations, we calculate the atomic absorption and dispersion. The results show that for different squeezing conditions of the field fluctuations, atomic absorption-lineshape exhibits sub-or super-natural linewidth phenomenon. Atomic dispersion depends on the squeezing direction and coherent excitation direction of the driving field. When these two directions are not parallel or perpendicular to each other, the dispersion zero-point shows a shift to the transition frequency of the atom.