简并四波混频诱导光放大效应的实验研究  

Experimental Research on Optical Amplification Effect Induced by Degenerate Four-Wave Mixing

作　　者：周海涛[1] 戴玉鹏 郭瑞翔 解舒云 王丹[1] 杨保东[1] Zhou Haitao;Dai Yupeng;Guo Ruixiang;Xie Shuyun;Wang Dan;Yang Baodong(College of Physics and Electronic Engineering,Shanxi University,Taiyuan,Shanxi 030006,China)

机构地区：[1]山西大学物理电子工程学院,山西太原030006

出　　处：《光学学报》2021年第18期223-230,共8页Acta Optica Sinica

基　　金：国家自然科学基金(11704235,61975102,61575112);山西省青年科技研究基金(201901D211166);山西省高等学校科技创新项目(2020L0038)。

摘　　要：实验研究了铯蒸气中受激简并四波混频(DFWM)产生的一对共轭光束的增益谱。结果表明,在简并二能级跃迁系统中,只有当基态的角动量大于或等于激发态的角动量时,才能发生基于受激DFWM的光放大效应。在考虑原子的所有塞曼子能态后,定性理论分析表明,该过程是在稳定的基态塞曼相干且初始塞曼子能级上有大量原子布居的前提下,基于多个N型跃迁环路实现的。并进一步分析了泵浦功率、原子数密度和单光子失谐等实验参量对DFWM信号增益的影响。此外,研究发现,额外引入一束波长为852 nm的抽运光,可显著提高DFWM的放大效率。We experimentally investigate the gain spectra of a pair of conjugate beams by stimulated degenerate four wave mixing(DFWM)in cesium vapor.The results show that in a degenerate two-level transition system,the optical amplification effect based on stimulated DFWM can occur only when the angular momentum of ground state is greater than or equal to that of excited state.After considering all Zeeman sub-states of atoms,the qualitative theoretical analysis shows that the process is based on multiple N-type transition loops under the premise of stable ground state Zeeman coherence and large population of atoms at the initial Zeeman level.The effects of experimental parameters such as pump power,atomic number density and single photon detuning on the gain of DFWM signals are further analyzed.Moreover,it is found that the amplification efficiency of DFWM can be significantly improved by introducing an additional driving beam with a wavelength of 852 nm.

关 键 词：量子光学 光放大 简并四波混频 电磁诱导透明 基态相干 抽运光 

分 类 号：O436[机械工程—光学工程]