强激光与粒子束, 2009, 21 (6): 831, 网络出版: 2009-11-24
激光等离子体对反射波频移影响的实验研究
Experimental study of the frequency shift of the reflected microwave from laser-induced plasma
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。
Abstract
Frequency downshift and upshift of microwaves reflected by laser-induced plasma were detected in the experiments.The microwave produced by a microwave generator impinges on the laser-induced plasma.The microwave reflected by the pulsed plasmas is received by the spectrum analyzer. Both in plasma expansion process and in plasma extinguishing process,the maximum frequency shift of the reflected microwave was investigated as a function of laser power density and the frequency of the incident microwave,and the results show that with increasing laser power density,the maximum frequency shift is monotonously increasing,and the frequency shift decreases with increasing frequency of the incident microwave.
吴莹, 陈建平, 倪晓武, 楚然. 激光等离子体对反射波频移影响的实验研究[J]. 强激光与粒子束, 2009, 21(6): 831. Wu Ying, Chen Jianping, Ni Xiaowu, Chu Ran. Experimental study of the frequency shift of the reflected microwave from laser-induced plasma[J]. High Power Laser and Particle Beams, 2009, 21(6): 831.