研究目的
Investigating the effects of collinear dual-pulse laser optical breakdown and energy deposition in non-equilibrium plasmas.
研究成果
The collinear dual-pulse approach enhances energy deposition efficiency and allows for tailoring the plasma kernel's size and shape by adjusting the spatial and temporal offsets of the pulses. This method presents an attractive alternative to single laser discharges for controlling electron temperature and plasma kernel dimensions.
研究不足
The model slightly over-predicts the heavy-particle temperature in the post-discharge phase, possibly due to the absence of plasma emission and re-absorption in the current formulation. The study focuses on early post-discharge phases and may not capture long-term plasma behavior accurately.
1：Experimental Design and Method Selection:
The study uses a non-equilibrium model for laser-generated plasmas, governed by the two-temperature Navier-Stokes equations, accounting for Multiphoton ionization (MPI) and inverse Bremsstrahlung (IB). The interaction between the laser beam and the plasma is modeled based on the Radiative Transfer Equation (RTE).
2：Sample Selection and Data Sources:
The experiments are conducted in quiescent air (T = 298 K, p = 1 atm) and molecular oxygen, with initial conditions specified for each scenario.
3：List of Experimental Equipment and Materials:
UV laser pulse at 266 nm and NIR pulse at 1064 nm are used, with specified energies, focal lengths, and beam diameters.
4：Experimental Procedures and Operational Workflow:
The UV pre-ionization pulse is followed by a NIR pulse with a delay, focusing on different points to study the plasma kernel dynamics.
5：Data Analysis Methods:
The analysis includes the evolution of plasma kernel dynamics, shock wave energy calculation using Jones semi-empirical formulas, and vorticity generation analysis.
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