研究目的
Investigating the effects of water vapor ionization on the nonlinear propagation of femtosecond laser pulses with a 248 nm wavelength in air.
研究成果
The study demonstrates that ionization of H2O molecules significantly affects the dynamic and energy deposition of femtosecond laser filamentation in air. The total number of electrons and deposited pulse energy increase with humidity but saturate in high humidity conditions. These findings are important for understanding the long-range propagation of filaments under various atmospheric conditions.
研究不足
The study is based on numerical simulations, which may not fully capture all physical phenomena present in real-world experiments. The effects of other atmospheric components and conditions were not considered.
1：Experimental Design and Method Selection:
The propagation of femtosecond laser pulses in air with different humidity levels was numerically investigated using the nonlinear Schr?dinger equation (NLSE) to model the evolution of the electric field envelope of the pulse.
2：Sample Selection and Data Sources:
The study considered air with different humidity levels, varying the water vapor content to simulate different atmospheric conditions.
3：List of Experimental Equipment and Materials:
The simulation did not involve physical equipment but was based on theoretical models and parameters from previous studies.
4：Experimental Procedures and Operational Workflow:
The NLSE was solved using a standard split step Crank-Nicholson scheme for the linear part and the fourth-order Runge–Kutta method for the evolution equation of electron density.
5：Data Analysis Methods:
The analysis focused on the on-axis intensity, electron density, number of electrons ionized, and pulse energy as functions of propagation distance.
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