激光等离子体对反射波频移影响的实验研究

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Experimental study of frequency shift of reflected microwave from laser-induced plasma

1.
Applied Physics Department,Nanjing University of Science and Technology,Nanjing 210094,China;
2.
Beijing Aeronautical Technology Research Center,Beijing 100076,China;
3.
Microwave Center,Nanjing University of Science and Technology,Nanjing 210094,China

摘要: 研究了微波被激光等离子体反射时反射波的频率变化。实验中微波发生器产生的微波入射到激光等离子体并被等离子体反射，反射波的频率由频谱分析仪测量，发现反射波的频率与入射波的频率明显不同，分析了在激光等离子体膨胀和熄灭两种情况下激光功率密度和入射波频率对反射波频移影响的原因。结果表明：在等离子体膨胀和熄灭过程中，反射波频移的最大值随激光功率密度的增加而增加；随入射微波频率的增加而减小。
- 激光等离子体 /
- 微波 /
- 反射 /
- 频移
Abstract: Frequency downshift and upshift of microwaves reflected by laser-induced plasma were experimentally studied. In the experiments, the microwave produced by a microwave generator impinged on the laser-induced plasma. The frequency of the microwave reflected by the pulsed plasmas was measured by a spectrum analyzer. Both in plasma expansion and extinguishing processes, the maximal frequency shift of the reflected microwave was found to be a function of laser power density and the frequency of the incident microwave. The results show that the maximal frequency shift monotonously increases with increasing the laser power density, and decreases with increasing the frequency of the incident microwave．
- laser-induced plasma /
- microwave /
- reflection /
- frequency shift

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