Chuliang Zhou, Y. Bai, Zhongpeng Li, Yingying Ding, Haiyi Sun, Ye Tian
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引用次数: 1
Abstract
The influence of the preplasma on laser induced shockwave in the laser and aluminum-coated planar dielectric target interaction at vacuum has been investigated with the shadowgraphy method. While the laser irradiate on the aluminum-coated dielectric target at intensity of about 1017 W/cm2 , the metallic layers absorb laser energy, evaporate and ionize into plasma, it is verified that the scale length of laser-produced plasma is dramatically dependent on the contrast ratio of femtosecond-laser while the main laser pulse energy is almost kept. The characteristics of laser induced shock wave in nanosecond time scale were studied. In the nanosecond time scale, shock wave is only observed in the case of relatively short plasma scale length. This result can be explained by the dissipation of the shock wave during its propagation in the preplasma. In addition, we performed numerical simulation with MULTI2D to get an insight into the propagation of shock wave in the overdense plasma [R. Ramis, J. Meyer-ter-Vehn, and J. Ramirez, Comput. Phys. Commun. 180 , 977 (2009)].
采用影影法研究了真空条件下激光与镀铝平面介质靶相互作用中预等离子体对激光诱导冲击波的影响。当激光以约1017 W/cm2的强度照射在镀铝介质靶上时,金属层吸收激光能量,蒸发并电离成等离子体,验证了激光产生的等离子体的尺度长度与飞秒激光的对比度有很大的关系,而主激光脉冲能量基本保持不变。研究了激光诱导激波在纳秒时间尺度上的特性。在纳秒时间尺度下,只有在相对较短的等离子体尺度长度下才能观察到激波。这一结果可以用激波在预等离子体中传播过程中的耗散来解释。此外,我们利用MULTI2D进行了数值模拟,以深入了解激波在过密等离子体中的传播[R]。Ramis, J. Meyer-ter-Vehn和J. Ramirez,《计算机》。理论物理。普通。180,977(2009)]。
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