摘要
利用“星Ⅱ”０．３５μｍ激光（能量２０Ｊ～９０Ｊ，焦斑Φ～２００μｍ，脉冲宽度４００ｐｓ～８００ｐｓ）辐照铝靶，得到了对于不同激光功率密度亚千Ｘ光转换效率，并提出了一个简化理论模型，来解释０．３５μｍ激光辐照铝靶ｘ光转换效率。在这个模型中，由于热传损失激光能量，因此对于低功率密度激光，ｘ光转换效率较低，同时对于高功率密度激光，由于等离子体喷射损失激光能量，因此转换效率也较低。这样存在某合适的激光功率，这时ｘ光转换效率达到最大值。
Soft X ray conversion efficiency from 0. 35μm laser-irradiated Al foil at different laser intensities on the 'Xingguang Ⅱ' facility (energy 20J- 90J, focal spot ￣ 200μm, FWHM 400ps- 800ps) was obtained. A simple model was given to explain soft x ray conversion efficiency from 0. 35μm laser-Al plasma interaction. In this model, because of heat conduction away from the laser heated spot, the vonersion was very small at some low irradiance limit,while at some high irradiance limit it was bounded by the energy lost in plasma blowoff.Consequently, at some approximate laser intensity, the X ray conersion efficiency should reach a maximum.
出处
《原子与分子物理学报》
CAS
CSCD
北大核心
1995年第3期223-228,共6页
Journal of Atomic and Molecular Physics
关键词
X光转换效率
铝靶
测量
激光
模型
X ray conersion efficiency
heat conduction
plasma blowoff
