文献类型：期刊文献

英文题名：Enhanced Kerr nonlinearity based on wave-number mismatch in hot atoms

作者：Jiang, Xueyi[1];Zhang, Lida[1];Niu, Yueping[1,2];Gong, Shangqing[1,2,3]

机构：[1]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[2]Shanghai Frontiers Sci Ctr Optogenet Tech Cell Met, Shanghai 200237, Peoples R China;[3]Hefei Natl Lab, Hefei 230088, Anhui, Peoples R China

年份：2026

卷号：113

期号：5

外文期刊名：PHYSICAL REVIEW A

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001766013900001)】；

基金：This work was supported by the Quantum Science and Technology-National Science and Technology Major Project (Grant No. 2021ZD0300802) , the National Natu-ral Science Foundation of China (Grants No. 12034007 and No. 12374327) , Major Project of Shanghai Municipal Education Commission (Grant No. 2023ZKZD39) , and Pro-gram of Shanghai Academic Research Leader (Grant No. 21XD1400700) .

语种：英文

摘要：Optical Kerr nonlinearity is important for various applications in both classical and quantum regimes. It has been shown that Kerr nonlinearity can be considerably enhanced based on electromagnetically induced transparency in cold atoms. However, in a hot atomic ensemble the Kerr nonlinearity is usually weakened by the Doppler effect. Here we show that the Kerr nonlinearity can be enhanced by tuning the wave-number mismatch between the probe and control fields in hot atoms. When the wave number of the control field, denoted by k(c), is larger than that of the probe field, denoted by k(p), the transition strength for the probe field from the ground to two dressed states created by the control field becomes stronger, leading to an increased nonlinear dispersion and absorption. Upon increasing the ratio k(c)/k(p) further, the effective number of atoms contributing to the interaction decreases such that the nonlinear dispersion and absorption are eventually reduced. Nevertheless, the peak nonlinear dispersion and absorption are enhanced by factors of up to 3 and 2, respectively, for k(c)/k(p) > 1 in comparison to the case of k(c)/k(p) = 1. Our results may be beneficial for a variety of applications where the Kerr nonlinearity is crucial.