激光等离子体动量转换效率的实验研究  

Experimental study on the momentum coupling efficiency of laser plasma

作　　者：郑志远[1] 鲁欣[1] 张杰[1] 郝作强[1] 远晓辉[1] 王兆华[1] 

机构地区：[1]中国科学院物理研究所光物理重点实验室,北京1000801

出　　处：《物理学报》2005年第1期192-196,共5页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :10 0 0 40 15;10 1760 3 4);国家重点基础研究项目(批准号:G19990 75 2 0 6);国家高技术项目资助的课题~~

摘　　要：强激光与固体靶相互作用时 ,产生的高速喷射的等离子体对靶具有强烈的反冲作用 ,因此 ,激光等离子体可以作为一种新型的推进动力源 .与传统的化学燃料推动相比 ,激光等离子体具有较高的比冲和有效载荷比等特点 .对纳秒激光脉冲与铝、石墨、铅和碳氢靶相互作用时 ,等离子体对靶的冲量进行了实验测量 ,研究了大气与真空环境下的靶动量与激光聚焦面积的关系 ,并对部分实验结果与理论计算的数值进行了比较 .实验结果显示 ,大气与真空环境下的靶动量有很大的差异 ,并且真空下的靶动量受材料性质的影响较大 。During the interaction of laser with solid targets, the counteracting force is generated by the plasma, which can be used as a new type source of propulsion. Compared with the chemical propulsion, laser plasma has unique advantages such as high specific impulse and large load ratio. In this paper, the momentum generated by the laser plasma is measured during the interaction of nanosecond laser pulses with aluminum, graphite, lead and CH targets. The relation of target momentum with laser focal area in atmosphere and vacuum ambient pressure is obtained, and the comparison is performed between the experimental and analytical results. It is shown that the target momentum in vacuum is different from that in atmosphere. In vacuum, the target momentum shows a dependence on the target property. These results are different from those generated by long width pulses.

关 键 词：动量 激光等离子体 固体靶 纳秒激光 相互作用 光脉冲 冲量 体动 长脉冲激光 实验研究 

分 类 号：TN24[电子电信—物理电子学]