近红外波段偏振编码用分色片的设计与制作
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中国科学院上海技术物理研究所,中国科学院上海技术物理研究所,中国科学院上海技术物理研究所,中国科学院上海技术物理研究所,中国科学院上海技术物理研究所

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Design and fabrication of near-infrared dichroic beam-splitter for polarization state coding
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Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai Institute of Technical Physics,Chinese Academy of Sciences

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    摘要:

    在基于偏振编码的光通信试验中,需要对不同波长的线偏光进行光路分离,同时要保持分离后线偏光的偏振方向和消光比,为此设计和制备了入射角为45?的810nm波长透射/850nm波长反射的近红外分色片。为了抑制斜入射条件下工作波长附近s、p偏振分量的能量、相位分离,选择了合适的基础膜系,利用旁反射带边缘透、反射带光谱过渡迅速的特性,实现了临近波长的光路分离,也减小了偏振分离;通过非规整膜层的相位补偿和软件自动优化,实现了设计目标。分别选用TiO2和SiO2为高低折射率膜层材料,以离子束辅助沉积技术镀制薄膜,采用光学极值法和晶体振荡法结合的方式控制膜层厚度。制备的样品在波长810nm处的消光比达到7000:1以上,在850nm处达到20000:1,实现了分色片对相位的控制,满足了偏振编码光通信试验的需求。

    Abstract:

    For separating two wavelengths of 810nm and 850nm polarized light into two optical beams, keeping their polarization directions and pursuing the maximal degree of polarization, a dichroic beam-splitter at incidence angle of 45?is designed and fabricated, and it makes 810nm beam passed and 850nm beam reflected. Selected an apposite initial film configuration to control the separation of s- and p-polarization components, and optimized the the film configuration by the Global Modified LM method in Film Wizard software, and the phase and energy parameters meet the design target. TiO2 and SiO2 have been chosen as high- and low-refractive index layer materials respectively. Ion beam-assisted deposition, optical extreme value method, and quartz crystal oscillator have been used to control the thickness of films . The extinction ratio of obtained sample reaches 7000:1 in 810nm beam and 20000:1 in 850nm beam. This work realized phase and energy control of optical thin films to meet the demands of polarization states coding communication experiment.

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尹欣,刘定权,段微波,李大琪,陈刚.近红外波段偏振编码用分色片的设计与制作[J].红外与毫米波学报,2012,31(6):505~509]. YIN Xin, LIU Ding-Quan, DUAN Wei-Bo, LI Da-Qi, CHEN Gang. Design and fabrication of near-infrared dichroic beam-splitter for polarization state coding[J]. J. Infrared Millim. Waves,2012,31(6):505~509.]

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  • 收稿日期:2011-12-22
  • 最后修改日期:2012-07-08
  • 录用日期:2012-02-21
  • 在线发布日期: 2012-11-21
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