室温原子系统中的电磁感应光栅效应  

Electromagnetically Induced Grating Effect in Room-Temperature Atomic System

作　　者：董雅宾[1] 周志英 李俊燕 刘瑶瑶 

机构地区：[1]山西大学物理电子工程学院,山西太原030006

出　　处：《中国激光》2017年第9期283-289,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(11004126;61275212);山西省基础研究计划(2011021003-1)

摘　　要：分别在冷原子和室温原子系统下对电磁感应光栅(EIG)效应进行了理论研究。研究结果表明,冷原子和室温原子的一级衍射效率分别可以达到32.5%和30%,这两个衍射效率都非常接近正弦相位光栅的理想衍射效率。在实际情况中,冷原子系统比室温原子系统更难制备,系统更为庞大,且对实验要求更高,因此,利用室温原子实现EIG更有优势。当信号光和探测光的功率极低时,仍然可以产生EIG效应,且其一级衍射效率接近于理论最大值,该结论可以用来实现弱光对弱光的调控。The electromagnetically induced grating （EIG） effect is theoretically studied under the cold atomic and room-temperature atomic systems, respectively. The study results show that the first-order diffraction efficiencies in the cold atomic system and the room-temperature atomic system can reach 32.5% and 30%, respectively. The two diffraction efficiencies are very close to the ideal diffraction efficiency of a sinusoidal grating. However, as far as the actual condition is concerned, the preparation of a cold atom system is more difficult than that of a room- temperature atomic system. Moreover, the cold atomic system is more complex and requires higher experimental conditions. Therefore, the realization of EIG with room-temperature atoms is more superior. The theoretical studies also indicate that the EIG effect can also occur with low-power signal and low-power probe beams, and the first- order diffraction efficiency is close to the theoretical maximum, which can he used to realize a weak field modulation with another weak field.

关 键 词：量子光学 电磁感应光栅 四能级原子系统 室温原子系统 一级衍射效率 

分 类 号：O431.2[机械工程—光学工程]