Abstract
When high energy infrared laser pulses are incident on fused silica, the surface of the fused silica is damaged and a laser-induced plasma is produced. Based on the theory of fluid mechanics and gas dynamics, a two-dimensional axisymmetric gas dynamic model was established to simulate the plasma generation process of fused silica induced by a millisecond pulse laser. The results show that the temperature of the central region irradiated by the laser is the highest, and the plasma is first produced in this region. When the laser energy density is 1.0 × 104 J/cm2 and the pulse width is 0.2 ms, the maximum expansion velocity of the laser-induced plasma is 17.7 m/s. Under the same experimental conditions, the results of the simulation and experiment are in good agreement. With an increase in pulse width, the plasma expansion rate gradually decreases.
Highlights
Under millisecond pulse laser irradiation, the laser energy densities used to simulate the plasma generated by laser irradiation of fused silica were 8.0 × 103 J/cm2, the pulse width was 0.2 ms, and the irradiation radius was 0.25 mm
The temperature field results of the numerical simulation of the plasma generated by the millisecond pulse laser induced fused silica were as follows: When the laser with an energy density of 8.0 × 103 J/cm2 irradiated the surface of the fused silica material, the main form of plasma generated in the laser irradiation area was thermally induced plasma
This paper considered the laser energy generation transmission processes includingThe thermal rasimulation model still has some shortcomings, and people need to continue to improve it diation, heat conduction, and convection, and simulated the whole physical process of the in future work, so that it can represent a more realistic physical process
Summary
The research on millisecond pulse laser-induced plasma generation of fused silica is quite scarce. It is necessary to carry out related research on the plasma generation of fused silica induced by an infrared millisecond pulse laser. The finite element method is used to simulate the plasma generation process of fused silica induced by the infrared millisec of 11 ond pulse laser; the results of the simulation and experiment are in good agreement, and the results have good convergence. The laser interacted withspontaneously the ejected gaseous into the action of atmosphere under highwas pressure by craters the high temperature, material, the atoms were ionized, the the plasma formed,generated and ablation appeared in thewas laser-irradiated target area.of.
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