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首页> 外文期刊>Optical engineering >Femtosecond laser inscribed cladding waveguide structures in LiNbO_3 crystal for beam splitters
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Femtosecond laser inscribed cladding waveguide structures in LiNbO_3 crystal for beam splitters

机译：飞秒激光内嵌分束器LiNbO_3晶体中的包层波导结构

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摘要

Depressed cladding, buried waveguides, and beam splitters in z cut LiNbO_3 crystals were fabricated by femtosecond laser inscription. Straightforward cladding waveguides were optimized by varying the laser writing conditions. Minimum propagation losses of 0.74 dB/cm at 1.05-μm wavelength were obtained. Two-dimensional 1×2 and three-dimensional 1×4 beam splitters were realized. 1×2 Y-splitters with circular cladding geometry are fabricated with 60-μm diameter input ends, corresponding to two 30-μm diameter output ends, respectively. The full branching angle between the two output arms are changing from 0.5 deg to 2.4 deg. The splitters were characterized both experimentally and numerically, showing excellent properties including symmetrical output ends and equalized splitting ratio. 1×4 splitters with square cladding geometry reached splitting ratios of 26:26:22:26. The micro-Raman spectra indicate the slight microstructural lattice changes in the track and core region.
机译：通过飞秒激光刻写制造了z切割的LiNbO_3晶体中的压制包层，掩埋波导和分束器。通过改变激光写入条件来优化直射包层波导。在1.05-μm波长处的最小传播损耗为0.74 dB / cm。实现了二维1×2和三维1×4分束器。制作具有圆形包层几何形状的1×2 Y分离器，其直径为60μm的输入端，分别对应于两个直径为30μm的输出端。两个输出臂之间的全分支角度从0.5度更改为2.4度。通过实验和数值对分离器进行了表征，显示出优异的性能，包括对称的输出端和均等的分离比。具有方形覆层几何形状的1×4分离器达到了26：26：22：26的分离比。显微拉曼光谱表明轨道和核心区域中的微结构晶格发生了微小变化。

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  • 来源
    《Optical engineering》 |2018年第11期|117103.1-117103.5|共5页
  • 作者

    Shi-Ling Li; Yongkai Ye; Chuan-Ying Shen; Hai-Long Wang;

  • 作者单位

    Qufu Normal University, School of Physics and Physical Engineering, Shandong Provincial Key Laboratory of Laser and Information Technology, Qufu, China;

    Qufu Normal University, School of Software Engineering, Qufu, China;

    Qufu Normal University, School of Physics and Physical Engineering, Shandong Provincial Key Laboratory of Laser and Information Technology, Qufu, China;

    Qufu Normal University, School of Physics and Physical Engineering, Shandong Provincial Key Laboratory of Laser and Information Technology, Qufu, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    optical cladding waveguides; beam splitters; femtosecond laser inscription; lithium niobate;

    机译：光学包层波导;分束器;飞秒激光铭文;铌酸锂;

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