Influence of annular portion of wrapped beam on propagation of central filament
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摘要: 光丝是超快激光应用的关键因素，促进光丝的远距离传输能够极大地开拓其应用前景。包裹光束能具有显著促进光丝远距离传输的特性，其环形部分在传输中发挥关键作用。基于分步傅里叶传输仿真方法，通过对比仿真实验系统地研究具有不同环形部分的包裹光束的传输特性。结果表明，输入包裹光束环形部分的能量、束腰半径和中心距离都会影响光丝的传输，通过调整其环形部分可以更好地促进激光成丝传输，进而拓展超快激光的应用领域。Abstract: Light filaments are pivotal in ultrafast laser applications, and enhancing the long-distance propagation of light filaments substantially broadens their application prospects.Wrapped beams exhibits characteristics that significantly enhance the long-distance propagation of light filaments, with their annular portions playing a crucial role during propagation. Based on the split-step Fourier transform simulation method, the propagation characteristics of wrapped beams endowed with varied annular segments were systematically investigated through comparative simulation. The results indicate that the input energy, beam waist radius and central distance of the annular portion of the wrapped beam all influence the filament's propagation. Fine-tuning the annular parameters can optimize the propagation efficiency of laser filamentation, expanding the applications domains of ultrafast lasers.
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图 1 高斯光束和包裹光束的束腰半径、轴上光强、轴上电子密度随传输距离的变化
Figure 1. Variation of beam radius, on-axis light intensity and electron density with propagation distance for wrapped beams and gauss beams
图 2 不同能量下束腰半径、轴上光强、轴上电子密度随传输距离的变化
Figure 2. Variation of beam radius, on-axis light intensity and electron density with propagation distance for different energy of annular parts
图 3 不同能量下脉冲能流随传输距离的变化
Figure 3. Variation of pulsed energy flux with propagation distance for different energy of annular parts
图 4 不同束腰下束腰半径、轴上光强、轴上电子密度随传输距离的变化
Figure 4. Variation of beam radius, on-axis light intensity and electron density with propagation distance for different radius of annular parts
图 5 不同束腰半径下脉冲能流随传输距离的变化
Figure 5. Variation of pulsed energy flux with propagation distance for different waist radius of annular parts
图 6 不同中心位置束腰半径、轴上光强、轴上电子密度随传输距离的变化
Figure 6. Variation of beam radius, on-axis light intensity and electron density with propagation distance for different central distance of annular parts
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