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Numerical Investigation on the Influence of Water Vapor Ionization on the Dynamic and Energy Deposition of Femtosecond Ultraviolet Laser Filamentation in Air

College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China
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Appl. Sci. 2019, 9(20), 4201; https://doi.org/10.3390/app9204201
Received: 14 August 2019 / Revised: 19 September 2019 / Accepted: 25 September 2019 / Published: 9 October 2019
(This article belongs to the Special Issue Ultrafast Optics 2020: Trends and Prospects)
The effects of water vapor ionization on the nonlinear propagation of femtosecond laser pulses with a 248 nm wavelength are numerically investigated in this paper. It is found that ionization of H2O molecules plays a significant role in air ionization, which seriously affects the dynamic and energy deposition of filamentation. The propagation of femtosecond pulses in air with different humidity levels are compared. The total number of electrons and total deposited pulse energy increase with the humidity increases. However, they tend to be saturated in high humidity conditions. Results presented here are conducive to characterizing the long-range propagation of filaments under atmospheric conditions. View Full-Text
Keywords: ultrafast nonlinear optics; atmospheric propagation; self-focusing; multiphoton absorption; water vapor ultrafast nonlinear optics; atmospheric propagation; self-focusing; multiphoton absorption; water vapor
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MDPI and ACS Style

Zeng, Q.; Liu, L.; Zhang, K.; Hu, S.; Gao, T.; Weng, C.; Chen, M. Numerical Investigation on the Influence of Water Vapor Ionization on the Dynamic and Energy Deposition of Femtosecond Ultraviolet Laser Filamentation in Air. Appl. Sci. 2019, 9, 4201.

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