Jiayu Zhao, Weiwei Liu, Shichang Li, Dan Lu, Yizhu Zhang, Yan Peng, Yiming Zhu, Songlin Zhuang, "Clue to a thorough understanding of terahertz pulse generation by femtosecond laser filamentation," Photonics Res. 6, 296 (2018)
- Photonics Research
- Vol. 6, Issue 4, 296 (2018)
Fig. 1. Schematic of the experimental setup and the coordinate system defined in this work. Inset: the recorded (a) E THz , X E THz , Y E THz , o E THz , e θ
Fig. 2. From top to bottom: simulation outcomes (lines) of 4WM, PC, 4WM + PC, and 4WM + PC + 1DND, together with experimental results (black circles) for (a) A THz , o A THz , e
Fig. 3. (a) N e θ d θ
Fig. 4. (a) Side CCD images of the plasma filaments [insets b 1 b 2 3(a) ], and the corresponding radial N e Re [ ϵ r ] 2 a
Fig. 5. Normalized | E r | 2 N e = b 1 b 2
Fig. 6. (a) Variations of the confined THz amplitude ratio η θ θ
Fig. 7. Coordinate system defined in this appendix.
Fig. 12. Calculation results of E 2 ω , e E ω , k E ω , l / E ω 4
Fig. 13. Results of simulations via the combination of 4WM and PC models with different amplitude ratios of 0 ∶ 1 1 ∶ 1 2 ∶ 1 A THz , o A THz , e
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