Interaction between laser and propellant gas
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摘要: 基于激光推进的工作特点,对激光推进中激光与工质的相互作用进行了研究.分析了激光对工质的击穿过程,得到了击穿阈值的计算方法,计算了激光对空气和氢气的击穿阈值;对工质中激光的逆韧致吸收过程进行了研究,推导了逆韧致吸收系数的计算公式.以氢气和氩气为工质进行了算例计算,计算结果可对国外文献提到的试验中出现的等离子体"漂白"和等离子体不稳定现象进行合理的解释.Abstract: Base on the characteristic of laser propulsion, an investigation was performed to find out the mechanism of the interaction between laser and propellant gas. The breakdown process of propellant gas was studied, calculation method of breakdown threshold value was obtained, the breakdown threshold value of hydrogen and air were calculated; the inverse bremsstrahlung absorption process was studied, calculation method of inverse bremsstrahlung absorption coefficient was obtained, the inverse bremsstrahlung absorption coefficient of hydrogen and argon were calculated. The result can reasonable explain the "blanch" phenomena and plasma instability in laser propulsion experimentation that is mentioned in some paper.
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Key words:
- threshold value /
- laser heating /
- breakdown /
- laser propulsion /
- inverse bremsstrahlung absorption
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