天文光纤机械扰模器调制环形光场的实验研究

穆丹丹, 朱永田, 张凯

穆丹丹, 朱永田, 张凯. 天文光纤机械扰模器调制环形光场的实验研究[J]. 应用光学, 2012, 33(5): 996-1001.
引用本文: 穆丹丹, 朱永田, 张凯. 天文光纤机械扰模器调制环形光场的实验研究[J]. 应用光学, 2012, 33(5): 996-1001.
shu
MU Dan-dan, ZHU Yong-tian, ZHANG Kai. Modulation of annular light distribution by mechanical fiber scrambler[J]. Journal of Applied Optics, 2012, 33(5): 996-1001.
Citation: MU Dan-dan, ZHU Yong-tian, ZHANG Kai. Modulation of annular light distribution by mechanical fiber scrambler[J]. Journal of Applied Optics, 2012, 33(5): 996-1001.
shu

天文光纤机械扰模器调制环形光场的实验研究

  • 1.

    中国科学院 国家天文台 南京天文光学技术研究所,江苏 南京 210042;

  • 2.

    中国科学院 天文光学技术重点实验室,江苏 南京 210042;

  • 3.

    中国科学院 研究生院,北京 100049

详细信息
    通讯作者:

    穆丹丹（1986-），女，安徽宿州人，硕士研究生，主要从事光纤天文应用研究工作。

  • 中图分类号: TN25；TH741

Modulation of annular light distribution by mechanical fiber scrambler

  • 1.

    Nanjing Institute of Astronomical Optics &Technology,National Astronomical Observatories,CAS,Nanjing 210042,China;

  • 2.

    Key Laboratory of Astronomical Optics &Technology,NanjingInstitute of Astronomical Optics &Technology,CAS,Nanjing 210042,China;

  • 3.

    Graduate University of Chinese Academy of Sciences,Beijing 100049,China

摘要

    摘要
  • 摘要: 光纤入射光束的角度和位置的变化对光纤出射光束的远场光强分布有较大影响。通过分析光纤出射光场的光强分布，研究了斜光束的偏轴角对光纤出射光场的影响。光纤耦合理论说明光纤的宏弯曲会使光纤内部模式相互耦合，根据这一原理设计一种能使光纤宏弯曲并以此来改善光纤出射场分布的机械扰模器。在实验中，对不同偏轴角入射及处于不同扰模程度的光斑进行中值滤波、高斯拟合等处理，得到光斑的径向光强分布曲线、高斯拟合度、不同出射焦比范围的能量变化等参数，以此分析机械扰模器的扰模效果。
    Abstract: The far-field pattern of fiber output beam changes dramatically due to different positions and angles of the input beam on fiber. This paper studies the change of the fiber-s output beam when the axis of input beam is shifted a small angle off the axis of optical fiber through the anlysis of the fiber-s output distribution. Fiber coupling theory indicates that the fiber macrobending leads to mutual coupling of fiber mode, so an improvement of fiber transmission with a mechanical scrambler which gives certain pressure to bend parts of fiber is designed. The collected output spots in different off-axis angles and scrambling degree are taken by median filtering and Gaussian fitting approaches. The scrambling effects are measured mainly through the profile of radial intensity distribution as well as its fitting degree of Gaussian distribution and the change of the energy ratio between different output focal ratio and input.
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    • 参考文献(1)
  • ［1］刘瑞斌. 天文用光纤特性的研究［D］. 长春：长春理工大学，2002.
    LIU Rui-bin. The study on fibers in astronomy［D］. Changchun: Changchun University of Science and Technology, 2002. (in Chinese)
    ［2］HU Hong-zhuan, XING Xiao-zheng, ZHAI Chao, et al. New type optical fiber positioning unit device for LAMOST［C］. Waikoloa, HI, USA: Large Groundbased Telescopes (SPIE) Conference, 2003.
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    ［4］郑史烈，章献民，陈抗生. 塑料光纤的远场辐射图和微分模式损耗研究［J］. 光子学报，2003, 32(12): 1334-1337.
    ZHENG Shi-lie, ZHANG Xian-min, CHEN Kang-sheng. Far field pattern and differential mode attenuation of POF［J］. Acta Photonica Sinica, 2003, 32(12): 1334-1337. (in Chinese with an English abstract)
    ［5］AVILA G, SINGH P, ALBERTSEN M. Photometrical scrambling gain and focal ratio degradation in fibers for astronomical instruments［C］. Orlando, FL, USA: Groundbased and Airborne Instrumentation for Astronomy (SPIE) Conference, 2006.
    ［6］AVILA G, BUZZONI B. Fiber characterization and compact scrambler at ESO［C］. Kona, HI, USA: Optical Astronomical Instrumentation (SPIE) Conference, 1998.
    ［7］AVILA G, SINGH P, ALBERTSEN M. A high-efficiency fibre double-scrambler prototype［C］. San Diego, California, USA: Ground-based and Airborne Instrumentation for Astronomy III (SPIE) Conference, 2010.
    ［8］AVILA G, KOHLER D, ARAYA M, et al. Performances of HARPS and FEROS fibres in La Silla ESO Observatory［C］. Glasgow, Scotland, United Kingdom: Ground-based Instrumentation for Astronomy (SPIE) Conference, 2004.
    ［9］AVILA G, SINGH P. Optical fiber scrambling and light pipes for high accuracy radial velocities measurements［C］. Marseille, France: Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation (SPIE) Conference, 2008.
    ［10］吴重庆. 光波导理论［M］. 第2版. 北京：清华大学出版社，2005.
    WU Chong-qing. Optical waveguide theory［M］. 2nd Edition. Beijing: Tsinghua University Press, 2005. (in Chinese)
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出版历程
  • 刊出日期:  2012-09-14

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