可调谐液晶滤波器的调谐性能研究  

Study of the Tuning Performance of Tunable Liquid Crystal Filter

作　　者：吕玮阁[1] 陈海星[1] 顾培夫[1] 刘旭[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,杭州310027

出　　处：《光学学报》2004年第11期1538-1542,共5页Acta Optica Sinica

基　　金：高等学校重点实验室项目资助课题

摘　　要：在电调谐液晶法布里珀罗腔滤波器的连续调谐过程中 ,存在“透射峰跳跃”现象 ,影响器件的单调调谐性。为了改善器件的单调调谐性能 ,对此现象进行了分析 ,表明这是由于法布里珀罗腔干涉级次在调谐过程中发生改变引起的 ;进而给出了法布里珀罗腔透射波长λ ,干涉级次m与腔内介质折射率n的关系 ,以及器件实际的有效调谐范围。当腔长为 10 μm、折射率差为 0 .0 5时 ,就可以使器件的单调调谐范围达到整个C波段。数值模拟与实验结果相吻合。并针对改善器件的单调调谐性能 ,提出了几种可行的方案。In the continuous tuning process of the electric tunable liquid crystal Fabry-Perot filter (LCFPF), the phenomenon of the jumping of the transmission peak spectrums is found. And this phenomenon influences the monotone tuning performance of the device. Analysis for this phenomenon shows that it's due to the change of the interference order of Fabry-Perot cavity in the tuning process. And the relationship between the transmission peak wavelength λ, the interference order m, and the index n of the medium in the Fabry-Perot cavity is given, as well as the effective tuning range of the device. When the length of the cavity is 10 μm, the tuning range will cover the whole C Band with the index difference of only 0.05. The experimental result is in agreement with the numeric simulation. At last, some approaches are presented in order to improve the monotone tuning performance of the device.

关 键 词：调谐范围 器件 可调谐 滤波器 电调谐 C波段 腔长 单调 液晶 连续 

分 类 号：O174[理学—数学] TN248[理学—基础数学]