中国激光, 2019, 46 (6): 0614026, 网络出版: 2019-06-14
离轴涡旋光束诱导空气等离子体产生太赫兹波 
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THz Wave Generation from Air Plasma Induced by Off-Axis Vortex Beam
图 & 表
图 1. 相息图。(a)右旋四阶涡旋光束;(b)右旋四阶离轴涡旋光束
Fig. 1. Phase diagram. (a) Right-handed fourth-order vortex beam; (b) right-handed fourth-order off-axis vortex beam
图 3. 相位奇点位置与太赫兹波强度示意图。(a)相位奇点位于(0.6,0)时,1~8阶离轴涡旋光束产生的太赫兹波强度;(b)离轴涡旋光束产生的最大太赫兹波强度与涡旋光束拓扑荷数的关系
Fig. 3. Position of phase singularity in beam and terahertz wave intensity. (a) Terahertz wave intensity generated by different order off-axis vortex beam when phase singularity is located at (0.6, 0); (b) relationship between maximum terahertz wave intensity generated by off-axis vortex beam and topological charge number of vortex beam
图 4. 等离子体体积与太赫兹波强度的关系。(a)左旋三阶涡旋光束的等离子体体积分布图;(b)图4(a)中阴影区域 对应的荧光图;(c)左旋三阶涡旋光束的太赫兹波强度;(d)右旋三阶涡旋光束的太赫兹波强度
Fig. 4. Relationship between plasma volume and terahertz wave intensity. (a) Plasma volume profile of left-handed third-order vortex beam; (b) fluorescence map corresponding to shaded area in Fig. 4(a); (c) terahertz wave intensity of left-handed third-order vortex beam; (d) terahertz wave intensity of right-handed third-order vortex beam
图 5. 不同左旋三阶涡旋光束波长下相位奇点在光束的各个位置产生的太赫兹波的强度。(a) 1550 nm;(b) 1530 nm;(c) 1510 nm;(d) 1490 nm;(e) 1470 nm;(f) 1450 nm
Fig. 5. Intensity of terahertz waves generated by phase singularities at various positions of beam under different wavelengths of left-handed third-order vortex beam. (a) 1550 nm; (b) 1530 nm; (c) 1510 nm; (d) 1490 nm; (e) 1470 nm; (f) 1450 nm
图 6. 在不同激光脉冲能量下左旋三阶涡旋光束相位奇点在光束各个位置产生的太赫兹波的强度比。(a) 0.02 mJ;(b) 0.018 mJ;(c) 0.016 mJ;(d) 0.014 mJ;(e) 0.012 mJ
Fig. 6. Intensity of terahertz waves generated by phase singularity at various positions of left-handed third-order vortex beam under different laser pulse energies. (a) 0.02 mJ; (b) 0.018 mJ; (c) 0.016 mJ; (d) 0.014 mJ; (e) 0.012 mJ
图 7. 涡旋光束产生的太赫兹波的强度、频谱和偏振特性。(a)高斯光束和三阶涡旋光束产生的太赫兹波能量增幅随激光脉冲能量的变化,插图是三阶涡旋光束在不同激光脉冲能量时对应产生的光丝图像;(b)高斯光束和三阶涡旋光束产生的太赫兹波能量增幅随激光波长的变化,插图是三阶涡旋光束在不同激光波长时对应产生的光丝图像;(c)不同光束产生的太赫兹波频谱;(d)不同光束产生的太赫兹波偏振状态
Fig. 7. Intensity, spectrum, and polarization characteristics of terahertz wave generated by vortex beam. (a) Energy amplification of terahertz wave generated by Gaussian beam or third-order vortex beam versus laser pulse energy, inset: filaments induced by third-order vortex beams with different laser pulse energies; (b) energy amplification of terahertz wave generated by Gaussian beam or third-order vortex beam versus laser wavelength, inset: filaments induced by third-order vortex beams with differen
蒋广通, 张亮亮, 吴同, 张存林. 离轴涡旋光束诱导空气等离子体产生太赫兹波[J]. 中国激光, 2019, 46(6): 0614026. Guangtong Jiang, Liangliang Zhang, Tong Wu, Cunlin Zhang. THz Wave Generation from Air Plasma Induced by Off-Axis Vortex Beam[J]. Chinese Journal of Lasers, 2019, 46(6): 0614026.
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