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首页> 外文期刊>Journal of Modern Optics >Fraunhofer and Fresnel field distributions from the LP01 mode in a micro-sized hollow optical fibre
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Fraunhofer and Fresnel field distributions from the LP01 mode in a micro-sized hollow optical fibre

机译：微型中空光纤中LP01模式的Fraunhofer和菲涅耳场分布

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摘要

The electric field distribution of a LP01 mode and properties of the evanescent-wave field in a micro-sized hollow optical fibre under the weakly guiding approximation are analysed. The far- and near-field distributions of the output beam from the LP01 mode and its propagation characteristics in free space are calculated numerically from Fraunhofer and Fresnel diffraction theory. We also derive an analytical expression of the far-field distribution of the LP01 mode and discuss its applicable conditions. Our study shows that the output beam of the LP01 mode in the hollow fibre is a dark hollow divergent beam whose near-field divergent angle is slightly smaller than the far-field divergent angle. The dark spot size (DSS) of the beam in the near field is about equal to the beam radius lo, whereas the DSS in the far field is smaller than its beam radius. We analyse the dependences of the far-field divergent angle of the output beam from the LP01 mode on various fibre parameters and briefly discuss potential applications of the dark hollow beam in atomic physics and atomic optics. [References: 21]
机译：在弱导近似下，分析了LP01模的电场分布和中空光纤中the逝波场的特性。 LP01模式的输出光束的近场和近场分布及其在自由空间中的传播特性是根据Fraunhofer和Fresnel衍射理论计算得出的。我们还导出了LP01模式的远场分布的解析表达式，并讨论了其适用条件。我们的研究表明，中空光纤中LP01模式的输出光束是暗中空发散光束，其近场发散角略小于远场发散角。近场中光束的暗点尺寸（DSS）大约等于光束半径Io，而远场中DSS的暗点尺寸小于其光束半径。我们分析了LP01模式输出光束的远场发散角对各种光纤参数的依赖性，并简要讨论了暗空心光束在原子物理学和原子光学中的潜在应用。 [参考：21]

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