レーザーアブレーションにより発生したジェットと雰囲気気体の干渉(高エネルギー(2),一般講演)

概要

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The impulse generated by irradiating a Nd:YAG laser energy onto an alminum target is calculated by simulating laser ablation processes. The effect of the thermochemistry of an ambient gas on the impulse generation is examined. A computational fluid dynamics technique is used to calculate the laser ablation phenomenon including thermal conduction within the aluminum target, the vaporization process under equilibrium thermodynamics through the Clausius-Clapeyron equation, and the expansion of aluminum ablation jet described by compressible gas dynamics with the laser radiation energy transfer. The comparison of the computed time history of the local impulse on an alminum target is made for the case of He and Ar as an ambient gas by accounting for with and without the ionization of the ambient gas. The result shows that the impact of the ionization reaction on the computed impulse history for the case of He is larger than for Ar.
2008-09-04