自由空间泵浦玻璃微球的光学特性

丁海珍; 吴越豪; 王训四

doi:10.37188/CJL.20210109

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自由空间泵浦玻璃微球的光学特性

材料合成及性能 | 更新时间：2021-07-22

- 自由空间泵浦玻璃微球的光学特性
  增强出版
- Optical Characterization of Free-space Coupled Microsphere Resonators
- 发光学报 2021年42卷第7期页码：1007-1013
- 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：
  
  [ "丁海珍(1996-)，女，安徽合肥人，硕士研究生，2019年于皖西学院获得学士学位，主要从事微球谐振腔的制备与表征等的研究。E-mail: 1911082077@nbu.edu.cn" ]
  [ "吴越豪(1982-)，男，浙江金华人，博士，副研究员，2012年于美国特拉华大学获得博士学位，主要从事光学设计、光学微型谐振腔的研究。E-mail:wuyuehao@nbu.edu.cn" ]
- 基金信息：
  
  国家自然科学青年基金(61605094);宁波大学王宽诚幸福基金资助项目
- DOI：10.37188/CJL.20210109
  中图分类号：
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丁海珍, 吴越豪, 王训四. 自由空间泵浦玻璃微球的光学特性[J]. 发光学报, 2021,42(7):1007-1013.

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.
丁海珍, 吴越豪, 王训四. 自由空间泵浦玻璃微球的光学特性[J]. 发光学报, 2021,42(7):1007-1013. DOI： 10.37188/CJL.20210109.

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,3+,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,3+,-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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