紫外超短脉冲激光辐照固体靶产生硬X射线研究
Generation of hard x-ray from solid target irradiated by UV high intensity ultrashort pulse laser
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摘要: 实验研究了紫外高强度超短脉冲激光(248nm, 440fs, 50mJ)辐照固体靶时产生的硬X-射线(>30 keV)能量连续谱，靶上强度达到1017 W/cm2。P极化光45°照射5mm铜片，实验探测到了能量大于200keV的X射线信号，利用Maxwellian分布拟合能谱得到了的超热电子温度为67keV。Abstract: Hard X-ray continuum generated from interaction of UV high intensity ultrashort pulse laser with solid target has been investigated by experiment. P-polarized light irradiate 5mm Cu slab with 45° ，the hard x-ray with energy of 200keV has been detected. Fitting the experiment data by Maxwellian distribution, the temperature of hot electron is 67keV. The experiment data is the results of combination of several absorption mechanisms.
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Key words:
- uv ultrashort laser /
- solid plasma /
- hard x-ray /
- hot electron
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