第24卷第1期 2016年1月
1004-924X(2016)01-0045-05
文章编号
光学精密工程
Optics and Precision Engineering
基于等效层理论的薄膜滤光片中心波长消偏振膜系设计
俞侃*，包佳祺
（文华学院信息科学与技术学部，湖北武汉430074）
Vol. 24No.1
Jan.2016
摘要：针对薄膜滤光片倾斜人射时产生的偏振光中心波长分离现象和偏振相关损耗，本文利用等效层理论设计了倾斜人射下中心波长消偏振的100GHz信道间隔滤光片膜系结构，实现了薄膜滤光片的角度和波长调谐。首先通过相位关系分析，计算了滤光片间隔层的消偏振等效折射率，实现了不同偏振光中心波长的对准，然后，根据等效层理论，设计三层对称膜层结构实现了对闻隔层中心波长消偏振等效折射率的替换。与原有的五层规整低偏振薄膜滤光片相比，本文提出的膜系结构更为筒单，对消偏振等效折射率的替换更为精确。伤真和实验结果表明：该膜系结构的薄膜滤光片能实现
0～20°倾斜人射的偏振光中心波长对准，偏振光波长偏离度小于0.03nm，波长调谱范固能达到35nm。关键词：薄膜滤光片；消偏振膜系；等效膜层；倾斜入射；中心波长
中图分类号：0484.1
文献标识码：A
doi:10.3788/OPE.20162401.0045
Designof thin filmfiltercentral wavelength depolarization
stack based on equivalent layers theory
YUKan'，BAOJia-qi
(Departmentof InformationScienceandTechnology,WenhuaCollege,Wuhan 430074,China)
Correspondingauthor，E-mail:dunyiyu@hust.edu.cn
Abstract: When a thin-film filter is used in oblique incidence, the central wavelengths of the polarization light will be separated obviously, and it will cause serious polarization dependent loss. Therefore, this paper designs a 1oo GHz channel spacing stack to depolarize in the central wavelength based on the equivalent layer theory and to realize the angle and wavelength tunes of the thin film filter.Firstly,the depolarization equivalent refractive index in the space layer of the filter was calculated by a phase analysis and to complement the alignment of the different polarization lights. Based on the equivalent layer theory, a symmetric three layer stack was designed to replace the depolarization equivalent refractive index of the spacer. As comparing with the original five layer low polarization thin film filter,the three layer spacer stack is simpler,and it is more accurate to replace the depolarization equivalent refractive index. The simulation and experimental results indicate that
收稿日期：2015-06-24；修订日期：2015-09-08
基金项目：国家自然科学基金资助项目（No.61205062)；潮北省教育厅科学研究计划资助项目（No.B2014246)；潮北
省高等学校中青年科技创新团队计划资助项目（No.T201431）；湖北省自然科学基金资助项目（No. 2012FFB02701)