Optical Characterization of Free-space Coupled Microsphere Resonators

Hai-zhen DING; Yue-hao WU; Xun-si WANG

doi:10.37188/CJL.20210109

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Optical Characterization of Free-space Coupled Microsphere Resonators

Synthesis and Properties of Materials | 更新时间：2021-07-22

- Optical Characterization of Free-space Coupled Microsphere Resonators
  增强出版
- Chinese Journal of Luminescence Vol. 42, Issue 7, Pages: 1007-1013(2021)
- 作者机构：
  
  1.宁波大学高等技术研究院　红外材料及器件实验室，浙江　宁波　 315211
  2.宁波大学　信息科学与工程学院，浙江　宁波　 315211
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(61605094);The K. C. Wong Magna Fund in Ningbo University, China
- DOI：10.37188/CJL.20210109
  CLC： O433.1
- Published：01 July 2021，
  
  Received：24 March 2021，
  
  Revised：08 April 2021，
- 稿件说明：
移动端阅览
HAI-ZHEN DING, YUE-HAO WU, XUN-SI WANG. Optical Characterization of Free-space Coupled Microsphere Resonators. [J]. Chinese journal of luminescence, 2021, 42(7): 1007-1013.
DOI：

HAI-ZHEN DING, YUE-HAO WU, XUN-SI WANG. Optical Characterization of Free-space Coupled Microsphere Resonators. [J]. Chinese journal of luminescence, 2021, 42(7): 1007-1013. DOI： 10.37188/CJL.20210109.

摘要

现有的微球谐振腔大多利用微纳光纤锥的倏逝波场为微球提供泵浦能量，这是因为其具有较高的模式耦合效率，但在实际应用中这种耦合方法欠缺一定的灵活性，且需要配备精密的耦合装置。本文探究了使用未拉锥的截断光纤从不接触微球的自由空间直接向微球导入泵浦光的可行性。在典型的Nd

掺杂碲酸盐玻璃微球/光纤锥耦合系统的基础上，用一根连接泵浦光源的截断光纤从自由空间直接照射微球的中心或边缘部位，可测出微球/光纤锥耦合系统的激光输出功率相对于原耦合系统明显提升;在关闭连接光纤锥的泵浦源而仅使用自由空间泵浦源的条件下，仍可获得明显的单纵模激光现象。本文利用时域有限差分法和几何光束追迹法的仿真模型还原了上述自由空间耦合法的全过程。仿真与实验结果表明，这种自由空间耦合法有潜力成为常规光纤锥耦合法的一种辅助泵浦方法，为需要更高泵浦功率或更多泵浦波长选择的实验场合提供解决方案。

Abstract

Most current microsphere resonators rely on the evanescent field of micro/nano fiber tapers to provide pump energy. The mode coupling efficiency of this method is high

but it lacks some flexibility in practical application

and needs to be equipped with precise coupling device. In this work

we study the feasibility of pumping microsphere resonators using truncated optical fibers from free space. An Nd

-doped tellurite glass microsphere/fiber taper coupling system is used as the experimental setup. We demonstrate that when the microsphere is directly illuminated by a free-space truncated optical fiber

additional pump energy can be introduced into the microsphere and output powers of microsphere laser modes can be increased. We also demonstrate that the free-space coupling method can excite a single longitudinal mode laser independently

without the assistance of the pump energy provided by the fiber taper. In this paper

the simulation models of finite-difference time-domain(FDTD) and geometric ray-tracing are used to restore the whole process of the free-space coupling method. Simulation and experimental results show that this free-space coupling method can potentially be used as a supportive pumping method for the classic fiber taper coupling method and can be helpful in experimental settings when additional pump powers or wavelength selections are needed.

关键词

自由空间泵浦微球激光器稀土掺杂回廊模

Keywords

free-space couplingmicrosphere laserrare earth ions dopingwhispering gallery mode

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Hai-zhen DING

Yue-hao WU

Xun-si WANG

Related Institution

Advanced Technology Research Institute， Laboratory of Infrared Materials and Devices， Ningbo University

Faculty of Electrical Engineering and Computer Science， Ningbo University

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