电磁诱导吸收的研究进展

Investigation of Electromagnetically Induced Absorption

电磁诱导吸收是光与物质相互作用中表现出来的奇特的非线性效应,对其形成机理及非线性特性的研究具有重要的理论意义和巨大的潜在应用价值.本工作以简并二能级、N型四能级系统和近似简并的Λ型能级系统的研究结果为基础,探讨了电磁诱导吸收的产生条件和本质.结果表明,原子相干对吸收的相长干涉产生电磁诱导吸收,而且其色散谱线在对应频率位置出现了变化剧烈的反常色散,可以引起探测光的群速增快甚至出现负群速,其应用前景正在进一步研究中.

Electromagnetically induced absorption （EIA） is an intriguing phenomenon of light-atom interaction. The study of its nonlinear behaviors has theoretical significance and potential applicat.ions. On the basis of the researches of degenerate two-level system, N-type four-level system and quasi degenerate N-type level system, the forming mechanism and creating conditions of EIA are given. The result that destructive interference of atomic coherence leads to electromagnetically induced absorption is shown. Furthermore, the dramatic change of dispersion line in the corresponding frequency occurs in the anomalous dispersion, which can be used to realize speeding up of the light group velocity or negative group velocity. The applications of EIA are being further studied.