受激Raman谱中的宏观极化干涉

Macroscopic effects in stimulated Raman spectra

研究了Rb85原子蒸气D1线系统中的受激Raman增益与损耗现象.实验中观察到随着抽运光失谐量的增大,受激Raman谱明显地呈现出一个从增益到损耗的陡峭转变.从缀饰态模型出发,我们提出这是对探测光有相反贡献的不同速度原子群之间极化干涉的结果.

In stimulated Raman gain and loss spectra with the D1 line of an Rbs5 atomic vapor system we observe experimentally that as the detuning of the pump field becomes larger, a probe beam can exhibit a sharp transition from gain to loss. We use the dressed-state model to explain this phenomenon as the consequence of polarization interference between atoms of different velocities, which have competing contributions to the probe beam.