原子介质中的近共振增益光栅  

Nearly-Resonant Gain Grating in Atomic Media

作　　者：董雅宾[1,2] 庞嘉璐 杨丽 刘瑶瑶[1] Dong Yabin;Pang Jialu;Yang Li;Liu Yaoyao(College of Physics and Electronic Engineering,Shanxi University,Taiyuan,Shamxi 030006,China;Collaborative Innovation Center of Eetreme Optics,Shanxi University,Taiyuan,Shanxci 030006,China)

机构地区：[1]山西大学物理电子工程学院,山西太原030006 [2]山西大学极端光学协同创新中心,山西太原030006

出　　处：《中国激光》2021年第3期156-163,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(11004126,61275212)。

摘　　要：研究了一种N型四能级原子结构中的近共振增益光栅(NRGG)效应。结果表明,当耦合场的失谐值为0,探测场和调制场的失谐值接近于0时,利用调制场和耦合场可以调控探测场的增益和相位,使得探测场的能量和高阶衍射效率都得到显著提高。在这个过程中,调制场强度存在阈值。获得了具有增益高、衍射能力强和阈值可控的光栅,该光栅在全光开关、全光逻辑门和全光调制等应用中将会发挥较大的作用。Objective With the increasing demand for high capacity and high speed information transmission,the transmission,storage,retrieval,transformation,and processing of optical information have become a very important research area in the field of information science.A grating is a type of optical device with a spatially-periodic structure.It has four main properties:dispersion,beam splitting,polarization,and phase matching.It is widely used in information processing,optical communication,optical storage,and other fields.However,when a grating is used in communications,it not only has a conversion efficiency and a conversion rate between optical and electrical signals,but also has the response rate of a mechanical structure,which has large effects on the signal transmission efficiency,bandwidth,and stability.Therefore,all-optical networks based on the all-optical switching technology have become a new focus of research.In all-optical networks,information transmission,transformation,and amplification do not need light-electricity conversion,and the optical structures are simple,reconfigurable with anti-interference capability,thus the utilization rate of network resources is improved.The core device of an all-optical network based on an all-optical switch has the advantages of stability,high capacity,and ultra-high speed,and thus,it has attracted more and more attention from researchers.Therefore,the purpose of this study is to realize all-optical control based on grating characteristics.We achieve a nearly-resonant gain grating effect that can be used to control light in realtime and thus all-optical control is realized.Methods In an N-type four-level atomic system,the analytical expression of the polarization rate of the probe field was first calculated by the density matrix method under the steady-state condition based on the perturbation theory.Then,the propagation equation of the probe field was obtained using Maxwell’s equations.From the analytical solution,the related factors affecting the diffraction efficienc

关 键 词：量子光学 电磁感应光栅 光增益 衍射效率 

分 类 号：O431.2[机械工程—光学工程]