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: 635次

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
Abstract
The spatial distribution of the forward-propagating amplified spontaneous emission (ASE) of nitrogen molecular ions during femtosecond laser filamentation in air is studied via numerical simulations. The results suggest that the divergence angle and signal intensity are extremely sensitive to the external focal length. Concurrently, we show that the optical Kerr effect plays a significant role in concentrating the directivity of ASE signals, particularly in cases of loose focusing. Furthermore, the simulations demonstrate that ASE signals are enhanced for a tight focus, although the corresponding filament length is shorter. The main physical mechanism underlying this process is the competition between the plasma defocusing and optical Kerr effects. The result is important for filamentation-based light detection and ranging applied to remote sensing.

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.

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