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:10.3788/COL202119.081402

Journals >Chinese Optics Letters >Volume 19 >Issue 8 >Page 081402 > Article

Chinese Optics Letters
Vol. 19, Issue 8, 081402 (2021)

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

Jiayun Xue¹, Hui Gao², Nan Zhang¹, Lu Sun¹, Lie Lin¹, and Weiwei Liu^1、*

Author Affiliations

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

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

show less

DOI: 10.3788/COL202119.081402 Cite this Article Set citation alerts

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 Copy Citation Text

EndNote(RIS)

BibTex

Plain Text

show less

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.

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.

Download full size | View in the Article

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. 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.

Download full size | View in the Article

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.

Download full size | View in the Article