原子气体中多波混频信号的空间调制研究

项目名称： 原子气体中多波混频信号的空间调制研究

项目编号： No.61308015

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 张贻齐

作者单位： 西安交通大学

项目金额： 28万元

中文摘要： 在多能级原子气体介质中，利用量子调控手段研究多束激光在满足相位匹配条件下产生的多波混频(MWM)的空间调制特性：1.改变激光的强度调节原子介质中三阶非线性和五阶非线性相对大小的变化，在满足非线性与衍射相互平衡的时候可以观察到MWM光涡旋孤子。通过原子相干技术调节在双光子共振位置处三五阶非线性以及伴随的增益和损耗之间的竞争，实现MWM基孤子、偶极孤子和涡旋孤子之间的自由转换。破坏孤子形成条件，利用多光束干涉技术实现MWM信号为涡旋、项链和方位角调制项链模式，分别研究它们在原子介质中的演化特性。2.原子相干可以在原子气体中诱导出电磁光栅，产生的MWM信号受到周期性光栅的调制，研究该光栅抑制增强位置处的带隙结构，周期性MWM的泰伯效应。3.MMW伴随产生的参量超荧光，研究其锥形辐射问题以及相关的MWM光子对关联与纠缠问题。此外，在原子气体与电介质的接触面上，研究空间调制后的MWM无衍射光演化等。

中文关键词： 光子拓扑绝缘体；无衍射自加速光；光涡旋；泰伯效应；原子气体

英文摘要： In multi-level atomic vapor medium, we study the spatial modulation properties of multi-wave mixing (MWM) generated from several laser beams satisfying phase-matching condition by the quantum control methods: 1. The cubic and quintic nonlinearities change with the intensity of laser beams, and if the total nonlinearity can balance the diffraction of MWM, MWM vortex solitons can be obtained. Through atomic coherence method, the competition between the cubic and quintic nonlinearities as well as the concomitant gain and loss can be adjusted, that the mutual transformation among the MWM fundamental solitons, dipole solitons and vortex solitons can be observed. When the balance between the nonlinearity and diffraction, we study the propagation properties of the vortex, necklace and azimuthon MWM modes obtained from multi-beam interference. 2. Electromagnetically induced grating can be induced in the atomic vapors through atomic coherence, and the MWM will be periodically modulated. We study the photonic band gap structures at the suppression and enhancement places, and the Talbot effect of the periodic MWM. 3. Superparameter fluorescence concomitant MWM, that we study its conical emission, and the correlation and entanglement of MWM photons. In addition, we study the evolution of nondiffraction MWM with spatial modu

英文关键词： photonic topological insulator；nondiffracting self-accelerating beams；optical vortices；Talbot effect；atomic vapors