External focusing dependence of spatial distribution of air lasers during femtosecond laser filamentation in air

Jiayun Xue; Hui Gao; Nan Zhang; Lu Sun; Lie Lin; Weiwei Liu

doi:doi:10.3788/COL202119.081402

Chinese Optics Letters, 2021, 19 (8): 081402, Published Online: May. 8, 2021

External focusing dependence of spatial distribution of air lasers during femtosecond laser filamentation in air Download： 651次

Jiayun Xue ¹Hui Gao ²Nan Zhang ¹Lu Sun ¹Lie Lin ¹Weiwei Liu ^1,*

Author Affiliations

¹ Institute of Modern Optics, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, Nankai University, Tianjin 300350, China

² School of Physical Science and Technology, Tiangong University, Tianjin 300387, China

Figures & Tables

Fig. 1. Spatial distributions of (a) nitrogen ion density induced by the filament and (b), (c) the photon density of air lasers (with and without the Kerr effect, respectively) for different external focusing conditions: (a1), (b1), (c1) f = 0.2 m; (a2), (b2), (c2) f = 1 m; (a3), (b3), (c3) f = 34 m.

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Fig. 2. Far-field angular distribution of the air laser for (a) f = 0.2 m, (b) f = 1 m, and (c) f = 34 m. (d) Divergence angle of the air laser as a function of the external focusing length.

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Fig. 3. Energy of the air laser along the propagation direction for external focus of (a) f = 0.2 m, (b) f = 1 m, and (c) f = 34 m. (d) Air laser energy as a function of the external focal length.

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Jiayun Xue, Hui Gao, Nan Zhang, Lu Sun, Lie Lin, Weiwei Liu. External focusing dependence of spatial distribution of air lasers during femtosecond laser filamentation in air[J]. Chinese Optics Letters, 2021, 19(8): 081402.

External focusing dependence of spatial distribution of air lasers during femtosecond laser filamentation in air Download： 651次

Fig. 2. Far-field angular distribution of the air laser for (a) f = 0.2 m, (b) f = 1 m, and (c) f = 34 m. (d) Divergence angle of the air laser as a function of the external focusing length.

Fig. 3. Energy of the air laser along the propagation direction for external focus of (a) f = 0.2 m, (b) f = 1 m, and (c) f = 34 m. (d) Air laser energy as a function of the external focal length.

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External focusing dependence of spatial distribution of air lasers during femtosecond laser filamentation in air Download： 651次

Fig. 2. Far-field angular distribution of the air laser for (a) f = 0.2 m, (b) f = 1 m, and (c) f = 34 m. (d) Divergence angle of the air laser as a function of the external focusing length.

Fig. 3. Energy of the air laser along the propagation direction for external focus of (a) f = 0.2 m, (b) f = 1 m, and (c) f = 34 m. (d) Air laser energy as a function of the external focal length.

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