长脉冲KrF激光驱动高速飞片实验研究
Experiment Study of Long Pulse Laser-Driven Flyer to High Velocity
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摘要: 利用侧向阴影成像技术开展了激光驱动高速金属飞片实验研究，并介绍了飞片实验系统与条纹相机时空标定结果。实验在辐照激光波长248 nm、脉宽28 ns、能量100 J、功率密度1.8×1012W/cm2的条件下加速带有50 μm烧蚀层的5 μm铝飞片至10 km/s左右。讨论了不同条件下加速过程的区别，分析了冲击波对飞片加速过程的影响，并从铝、钽飞片实验对比中发现激光烧蚀不同材料的能量转化效率是不同的。Abstract: The technology of side-on shadowgraph was developed to study the velocity of metal flyer driven by laser. The system of flyer experiment，the calibration of time and space axis of streak camera were introduced in the paper. With the laser of 248 nm wavelength, 28 ns pulse duration at laser energy of 100 J and laser intensity of 1.8×1012W/cm2, the 5 μm aluminum flyer with 50 μm ablation layer was accelerated to 10 km/s. The difference of accelerated process in different conditions was discussed and the effect of shock wave in flyer accelerated process was also analyzed in the paper. Through the comparison of Al and Ta experiment results, it is revealed that the energy conversion efficiency of laser material interaction is different for different materials.
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Keywords:
- side-on shadowgraph ,
- streak camera ,
- ablation layer ,
- shock wave ,
- energy conversion efficiency
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