589nm可调谐法拉第反常色散滤光器特性分析

Analysis of the Properties of Tunable Faraday Anomalous Dispersion Optical Filter at 589nm

考虑到钠原子Ｄ２线（３Ｓ１／２→３Ｐ３／２）５８９ｎｍ的超精细结构，以及具有Ｖｏｉｇｔ线型的左右旋园偏振谱线的贡献，我们对钠原子气体的法拉第反常色散滤光器的透过率、中心频率移动、通频带宽等跟外加纵向磁场强度、原子汽室温度的关系进行了理论分析．结果表明：该滤光器的中心工作频率磁场调谐能力约为８０ＧＨｚ／Ｔ，通频带宽为０．００１～０．０１ｎｍ，透过率约可达１００％．

Taking into account hyperfine structure of Na D2 line and circularly polarized components with a Voigt profile,the relation between the trasmission,central frequency shift and pass bandwidth of Na Faraday anomalous dispersion optical filter and extra longitudinal magnetic field strength and atomic gas temperature is analyzed.Results show that for this optical filter,the tuning ability is about 80GHZ/T,the pass bandwidth is from 0.001nm to 0.01nm and the transmission is about 100%.